Independent vendor review · 2026

Simple Peptide Review

Scored 8.32/10 on the published Peptide Source Review formula: lab credibility, shipping, pricing, operating history, and transparency.

Reviewed by the Peptide Source Review teamLast audited How we rate

COAs on file
44

COAs on file

Confirmed at the lab
44

Confirmed at the lab

Products
47

Products

Labs
1

Labs

8.32/ 10

Strong

Last scored

No testing cap

Weights are fixed for every vendor. Select a row to see how it was scored.

Is Simple Peptide legit?

Simple Peptide scores 8.32 out of 10 (Strong, #1 of 105) as of November 10, 2026 and passes our testing gate: 44 of the 46 products we score carry a certificate, 44 confirmed with the issuing lab (a lab we grade A). Its strongest area is lab testing (8.6/10); its weakest is operating history (7.2/10), with over seven years of records.

On lab evidence, the heaviest-weighted factor, Simple Peptide has independently verified third-party COAs, with COA work on record from Freedom Diagnostics Testing. Its lowest price per milligram in our data is on Glutathione (see the table below).

How this score was calculated

Every point below follows the published tables in our methodology, with the policy wording we scored and a link to where we read it. Evidence last checked November 9, 2026. Lab credibility is worked product by product from the certificates on file.

Lab credibility8.6/10

Each carried product (lab supplies excluded) is scored from the certificate on file for it, on the published lab rubric: 3 for a published certificate, then points for the laboratory, the verification key, the tests on the certificate and its purity, held to 0 to 10. A certificate that is self-issued, names no laboratory, or comes from a laboratory whose independence is not established scores a flat 2.0; a product with no certificate, a certificate the laboratory’s own record fails, or a posted copy that differs materially from the laboratory’s copy scores 0. Calculated on , the day this page was built; the date each certificate was tested is shown on its row.

  • Retatrutide9.5

    Certificate from Freedom Diagnostics Testing, tier A · tested 2026-10-19

    • 3.0Certificate published (base)
    • +2.0Laboratory in our directory at tier A (Freedom Diagnostics Testing)
    • +1.5Verification key printed
    • +1.5Key confirmed at the laboratory's own site
    • +0.5Endotoxin test
    • +0.5Sterility test (USP <71> or a PCR / rapid sterility screen)
    • +0.5Purity 99.96% (99.7% or higher)
    • 0.0Measured content 107.1% of label (90% of label or more)
  • Tirzepatide9.5

    Certificate from Freedom Diagnostics Testing, tier A · tested 2026-10-12

    • 3.0Certificate published (base)
    • +2.0Laboratory in our directory at tier A (Freedom Diagnostics Testing)
    • +1.5Verification key printed
    • +1.5Key confirmed at the laboratory's own site
    • +0.5Endotoxin test
    • +0.5Sterility test (USP <71> or a PCR / rapid sterility screen)
    • +0.5Purity 99.73% (99.7% or higher)
    • 0.0Measured content 108.5% of label (90% of label or more)
  • Semaglutide9.0

    Certificate from Freedom Diagnostics Testing, tier A · tested 2026-05-12

    • 3.0Certificate published (base)
    • +2.0Laboratory in our directory at tier A (Freedom Diagnostics Testing)
    • +1.5Verification key printed
    • +1.5Key confirmed at the laboratory's own site
    • +0.5Endotoxin test
    • +0.5Purity 99.91% (99.7% or higher)
    • 0.0Measured content 125.1% of label (90% of label or more)
  • Cagrilintide8.5

    Certificate from Freedom Diagnostics Testing, tier A · tested 2026-05-07

    • 3.0Certificate published (base)
    • +2.0Laboratory in our directory at tier A (Freedom Diagnostics Testing)
    • +1.5Verification key printed
    • +1.5Key confirmed at the laboratory's own site
    • +0.5Endotoxin test
    • 0.0Purity 99.66% (99.0% up to but not including 99.7%)
    • 0.0Measured content 101.2% of label (90% of label or more)
  • BPC-1579.5

    Certificate from Freedom Diagnostics Testing, tier A · tested 2026-10-16

    • 3.0Certificate published (base)
    • +2.0Laboratory in our directory at tier A (Freedom Diagnostics Testing)
    • +1.5Verification key printed
    • +1.5Key confirmed at the laboratory's own site
    • +0.5Endotoxin test
    • +0.5Sterility test (USP <71> or a PCR / rapid sterility screen)
    • +0.5Purity 99.87% (99.7% or higher)
    • 0.0Measured content 93.5% of label (90% of label or more)
  • BPC-157 + TB-5009.0

    Certificate from Freedom Diagnostics Testing, tier A · tested 2026-10-12

    • 3.0Certificate published (base)
    • +2.0Laboratory in our directory at tier A (Freedom Diagnostics Testing)
    • +1.5Verification key printed
    • +1.5Key confirmed at the laboratory's own site
    • +0.5Endotoxin test
    • +0.5Sterility test (USP <71> or a PCR / rapid sterility screen)
    • 0.0Purity 99.12% (99.0% up to but not including 99.7%)
    • 0.0Measured content 111.6% of label (90% of label or more)
  • TB-5008.5

    Certificate from Freedom Diagnostics Testing, tier A · tested 2026-03-19

    • 3.0Certificate published (base)
    • +2.0Laboratory in our directory at tier A (Freedom Diagnostics Testing)
    • +1.5Verification key printed
    • +1.5Key confirmed at the laboratory's own site
    • +0.5Endotoxin test
    • 0.0Purity 99.505% (99.0% up to but not including 99.7%)
    • 0.0Measured content 107.3% of label (90% of label or more)
  • GHK-Cu9.5

    Certificate from Freedom Diagnostics Testing, tier A · tested 2026-09-15

    • 3.0Certificate published (base)
    • +2.0Laboratory in our directory at tier A (Freedom Diagnostics Testing)
    • +1.5Verification key printed
    • +1.5Key confirmed at the laboratory's own site
    • +0.5Endotoxin test
    • +0.5Sterility test (USP <71> or a PCR / rapid sterility screen)
    • +0.5Purity 99.97% (99.7% or higher)
    • 0.0Measured content 102.8% of label (90% of label or more)
  • GLOW9.0

    Certificate from Freedom Diagnostics Testing, tier A · tested 2026-06-03

    • 3.0Certificate published (base)
    • +2.0Laboratory in our directory at tier A (Freedom Diagnostics Testing)
    • +1.5Verification key printed
    • +1.5Key confirmed at the laboratory's own site
    • +0.5Endotoxin test
    • +0.5Sterility test (USP <71> or a PCR / rapid sterility screen)
    • 0.0Purity 99.68% (99.0% up to but not including 99.7%)
    • 0.0Measured content 117.8% of label (90% of label or more)
  • KLOW9.0

    Certificate from Freedom Diagnostics Testing, tier A · tested 2026-07-22

    • 3.0Certificate published (base)
    • +2.0Laboratory in our directory at tier A (Freedom Diagnostics Testing)
    • +1.5Verification key printed
    • +1.5Key confirmed at the laboratory's own site
    • +0.5Endotoxin test
    • +0.5Sterility test (USP <71> or a PCR / rapid sterility screen)
    • 0.0Purity 99.54% (99.0% up to but not including 99.7%)
    • 0.0Measured content 113% of label (90% of label or more)
  • Tesamorelin9.0

    Certificate from Freedom Diagnostics Testing, tier A · tested 2026-10-07

    • 3.0Certificate published (base)
    • +2.0Laboratory in our directory at tier A (Freedom Diagnostics Testing)
    • +1.5Verification key printed
    • +1.5Key confirmed at the laboratory's own site
    • +0.5Endotoxin test
    • +0.5Sterility test (USP <71> or a PCR / rapid sterility screen)
    • 0.0Purity 99.5% (99.0% up to but not including 99.7%)
    • 0.0Measured content 98% of label (90% of label or more)
  • Ipamorelin9.5

    Certificate from Freedom Diagnostics Testing, tier A · tested 2026-06-03

    • 3.0Certificate published (base)
    • +2.0Laboratory in our directory at tier A (Freedom Diagnostics Testing)
    • +1.5Verification key printed
    • +1.5Key confirmed at the laboratory's own site
    • +0.5Endotoxin test
    • +0.5Sterility test (USP <71> or a PCR / rapid sterility screen)
    • +0.5Purity 99.77% (99.7% or higher)
    • 0.0Measured content 116.1% of label (90% of label or more)
  • CJC-12959.0

    Certificate from Freedom Diagnostics Testing, tier A · tested 2026-09-15

    • 3.0Certificate published (base)
    • +2.0Laboratory in our directory at tier A (Freedom Diagnostics Testing)
    • +1.5Verification key printed
    • +1.5Key confirmed at the laboratory's own site
    • +0.5Endotoxin test
    • +0.5Sterility test (USP <71> or a PCR / rapid sterility screen)
    • 0.0Purity 99.56% (99.0% up to but not including 99.7%)
    • 0.0Measured content 107.3% of label (90% of label or more)
  • CJC-1295 + Ipamorelin9.5

    Certificate from Freedom Diagnostics Testing, tier A · tested 2026-05-27

    • 3.0Certificate published (base)
    • +2.0Laboratory in our directory at tier A (Freedom Diagnostics Testing)
    • +1.5Verification key printed
    • +1.5Key confirmed at the laboratory's own site
    • +0.5Endotoxin test
    • +0.5Sterility test (USP <71> or a PCR / rapid sterility screen)
    • +0.5Purity 99.89% (99.7% or higher)
    • 0.0Measured content 111.9% of label (90% of label or more)
  • Selank9.0

    Certificate from Freedom Diagnostics Testing, tier A · tested 2026-10-12

    • 3.0Certificate published (base)
    • +2.0Laboratory in our directory at tier A (Freedom Diagnostics Testing)
    • +1.5Verification key printed
    • +1.5Key confirmed at the laboratory's own site
    • +0.5Endotoxin test
    • +0.5Sterility test (USP <71> or a PCR / rapid sterility screen)
    • 0.0Purity 99.07% (99.0% up to but not including 99.7%)
    • 0.0Measured content 115.8% of label (90% of label or more)
  • Semax9.0

    Certificate from Freedom Diagnostics Testing, tier A · tested 2026-09-17

    • 3.0Certificate published (base)
    • +2.0Laboratory in our directory at tier A (Freedom Diagnostics Testing)
    • +1.5Verification key printed
    • +1.5Key confirmed at the laboratory's own site
    • +0.5Endotoxin test
    • +0.5Sterility test (USP <71> or a PCR / rapid sterility screen)
    • 0.0Purity 99.43% (99.0% up to but not including 99.7%)
    • 0.0Measured content 122.1% of label (90% of label or more)
  • Melanotan-29.0

    Certificate from Freedom Diagnostics Testing, tier A · tested 2026-05-21

    • 3.0Certificate published (base)
    • +2.0Laboratory in our directory at tier A (Freedom Diagnostics Testing)
    • +1.5Verification key printed
    • +1.5Key confirmed at the laboratory's own site
    • +0.5Endotoxin test
    • +0.5Purity 99.83% (99.7% or higher)
    • 0.0Measured content 124% of label (90% of label or more)
  • Melanotan-19.5

    Certificate from Freedom Diagnostics Testing, tier A · tested 2026-10-12

    • 3.0Certificate published (base)
    • +2.0Laboratory in our directory at tier A (Freedom Diagnostics Testing)
    • +1.5Verification key printed
    • +1.5Key confirmed at the laboratory's own site
    • +0.5Endotoxin test
    • +0.5Sterility test (USP <71> or a PCR / rapid sterility screen)
    • +0.5Purity 99.79% (99.7% or higher)
    • 0.0Measured content 105.4% of label (90% of label or more)
  • PT-1419.5

    Certificate from Freedom Diagnostics Testing, tier A · tested 2026-10-12

    • 3.0Certificate published (base)
    • +2.0Laboratory in our directory at tier A (Freedom Diagnostics Testing)
    • +1.5Verification key printed
    • +1.5Key confirmed at the laboratory's own site
    • +0.5Endotoxin test
    • +0.5Sterility test (USP <71> or a PCR / rapid sterility screen)
    • +0.5Purity 99.92% (99.7% or higher)
    • 0.0Measured content 107.1% of label (90% of label or more)
  • Sermorelin8.5

    Certificate from Freedom Diagnostics Testing, tier A · tested 2026-04-29

    • 3.0Certificate published (base)
    • +2.0Laboratory in our directory at tier A (Freedom Diagnostics Testing)
    • +1.5Verification key printed
    • +1.5Key confirmed at the laboratory's own site
    • +0.5Endotoxin test
    • 0.0Purity 99.09% (99.0% up to but not including 99.7%)
    • 0.0Measured content 103.1% of label (90% of label or more)
  • MOTS-c9.0

    Certificate from Freedom Diagnostics Testing, tier A · tested 2026-10-12

    • 3.0Certificate published (base)
    • +2.0Laboratory in our directory at tier A (Freedom Diagnostics Testing)
    • +1.5Verification key printed
    • +1.5Key confirmed at the laboratory's own site
    • +0.5Endotoxin test
    • +0.5Sterility test (USP <71> or a PCR / rapid sterility screen)
    • 0.0Purity 99.18% (99.0% up to but not including 99.7%)
    • 0.0Measured content 112.5% of label (90% of label or more)
  • NAD+9.5

    Certificate from Freedom Diagnostics Testing, tier A · tested 2026-10-15

    • 3.0Certificate published (base)
    • +2.0Laboratory in our directory at tier A (Freedom Diagnostics Testing)
    • +1.5Verification key printed
    • +1.5Key confirmed at the laboratory's own site
    • +0.5Endotoxin test
    • +0.5Sterility test (USP <71> or a PCR / rapid sterility screen)
    • +0.5Purity 99.98% (99.7% or higher)
    • 0.0Measured content 115.8% of label (90% of label or more)
  • AOD-96048.5

    Certificate from Freedom Diagnostics Testing, tier A · tested 2026-06-03

    • 3.0Certificate published (base)
    • +2.0Laboratory in our directory at tier A (Freedom Diagnostics Testing)
    • +1.5Verification key printed
    • +1.5Key confirmed at the laboratory's own site
    • +0.5Purity 99.78% (99.7% or higher)
    • 0.0Measured content 93.1% of label (90% of label or more)
  • 5-Amino-1MQ8.5

    Certificate from Freedom Diagnostics Testing, tier A · tested 2026-09-17

    • 3.0Certificate published (base)
    • +2.0Laboratory in our directory at tier A (Freedom Diagnostics Testing)
    • +1.5Verification key printed
    • +1.5Key confirmed at the laboratory's own site
    • +0.5Purity 99.99% (99.7% or higher)
    • 0.0Measured content 102.5% of label (90% of label or more)
  • IGF-1 LR39.5

    Certificate from Freedom Diagnostics Testing, tier A · tested 2026-07-24

    • 3.0Certificate published (base)
    • +2.0Laboratory in our directory at tier A (Freedom Diagnostics Testing)
    • +1.5Verification key printed
    • +1.5Key confirmed at the laboratory's own site
    • +0.5Endotoxin test
    • +0.5Sterility test (USP <71> or a PCR / rapid sterility screen)
    • +0.5Purity 99.71% (99.7% or higher)
    • 0.0Measured content 110% of label (90% of label or more)
  • KPV9.5

    Certificate from Freedom Diagnostics Testing, tier A · tested 2026-10-19

    • 3.0Certificate published (base)
    • +2.0Laboratory in our directory at tier A (Freedom Diagnostics Testing)
    • +1.5Verification key printed
    • +1.5Key confirmed at the laboratory's own site
    • +0.5Endotoxin test
    • +0.5Sterility test (USP <71> or a PCR / rapid sterility screen)
    • +0.5Purity 99.88% (99.7% or higher)
    • 0.0Measured content 106.1% of label (90% of label or more)
  • Kisspeptin-108.5

    Certificate from Freedom Diagnostics Testing, tier A · tested 2025-12-19

    • 3.0Certificate published (base)
    • +2.0Laboratory in our directory at tier A (Freedom Diagnostics Testing)
    • +1.5Verification key printed
    • +1.5Key confirmed at the laboratory's own site
    • +0.5Purity 99.788% (99.7% or higher)
    • 0.0Measured content 112.7% of label (90% of label or more)
  • Epitalon9.0

    Certificate from Freedom Diagnostics Testing, tier A · tested 2026-10-20

    • 3.0Certificate published (base)
    • +2.0Laboratory in our directory at tier A (Freedom Diagnostics Testing)
    • +1.5Verification key printed
    • +1.5Key confirmed at the laboratory's own site
    • +0.5Endotoxin test
    • +0.5Sterility test (USP <71> or a PCR / rapid sterility screen)
    • 0.0Purity 99.55% (99.0% up to but not including 99.7%)
    • 0.0Measured content 91.1% of label (90% of label or more)
  • Thymosin Alpha-18.5

    Certificate from Freedom Diagnostics Testing, tier A · tested 2026-05-12

    • 3.0Certificate published (base)
    • +2.0Laboratory in our directory at tier A (Freedom Diagnostics Testing)
    • +1.5Verification key printed
    • +1.5Key confirmed at the laboratory's own site
    • +0.5Endotoxin test
    • 0.0Purity 99.61% (99.0% up to but not including 99.7%)
    • 0.0Measured content 101.4% of label (90% of label or more)
  • Glutathione9.5

    Certificate from Freedom Diagnostics Testing, tier A · tested 2026-09-17

    • 3.0Certificate published (base)
    • +2.0Laboratory in our directory at tier A (Freedom Diagnostics Testing)
    • +1.5Verification key printed
    • +1.5Key confirmed at the laboratory's own site
    • +0.5Endotoxin test
    • +0.5Sterility test (USP <71> or a PCR / rapid sterility screen)
    • +0.5Purity 99.86% (99.7% or higher)
    • 0.0Measured content 102.5% of label (90% of label or more)
  • DSIP9.5

    Certificate from Freedom Diagnostics Testing, tier A · tested 2026-06-11

    • 3.0Certificate published (base)
    • +2.0Laboratory in our directory at tier A (Freedom Diagnostics Testing)
    • +1.5Verification key printed
    • +1.5Key confirmed at the laboratory's own site
    • +0.5Endotoxin test
    • +0.5Sterility test (USP <71> or a PCR / rapid sterility screen)
    • +0.5Purity 99.74% (99.7% or higher)
    • 0.0Measured content 119% of label (90% of label or more)
  • ARA-2909.0

    Certificate from Freedom Diagnostics Testing, tier A · tested 2026-09-15

    • 3.0Certificate published (base)
    • +2.0Laboratory in our directory at tier A (Freedom Diagnostics Testing)
    • +1.5Verification key printed
    • +1.5Key confirmed at the laboratory's own site
    • +0.5Endotoxin test
    • +0.5Sterility test (USP <71> or a PCR / rapid sterility screen)
    • 0.0Purity 99.58% (99.0% up to but not including 99.7%)
    • 0.0Measured content 106.9% of label (90% of label or more)
  • GHRP-69.0

    Certificate from Freedom Diagnostics Testing, tier A · tested 2026-03-19

    • 3.0Certificate published (base)
    • +2.0Laboratory in our directory at tier A (Freedom Diagnostics Testing)
    • +1.5Verification key printed
    • +1.5Key confirmed at the laboratory's own site
    • +0.5Endotoxin test
    • +0.5Purity 99.796% (99.7% or higher)
    • 0.0Measured content 102.7% of label (90% of label or more)
  • GHRP-28.5

    Certificate from Freedom Diagnostics Testing, tier A · tested 2026-03-19

    • 3.0Certificate published (base)
    • +2.0Laboratory in our directory at tier A (Freedom Diagnostics Testing)
    • +1.5Verification key printed
    • +1.5Key confirmed at the laboratory's own site
    • +0.5Endotoxin test
    • 0.0Purity 99.426% (99.0% up to but not including 99.7%)
    • 0.0Measured content 93.8% of label (90% of label or more)
  • VIP7.5

    Certificate from Freedom Diagnostics Testing, tier A · tested 2026-03-17

    • 3.0Certificate published (base)
    • +2.0Laboratory in our directory at tier A (Freedom Diagnostics Testing)
    • +1.5Verification key printed
    • +1.5Key confirmed at the laboratory's own site
    • +0.5Endotoxin test
    • 0.0Purity 99.203% (99.0% up to but not including 99.7%)
    • −1.0Measured content 88.6% of label (80% up to but not including 90% of label)
  • Oxytocin8.5

    Certificate from Freedom Diagnostics Testing, tier A · tested 2026-06-01

    • 3.0Certificate published (base)
    • +2.0Laboratory in our directory at tier A (Freedom Diagnostics Testing)
    • +1.5Verification key printed
    • +1.5Key confirmed at the laboratory's own site
    • +0.5Endotoxin test
    • 0.0Purity 99.41% (99.0% up to but not including 99.7%)
    • 0.0Measured content 125% of label (90% of label or more)
  • LL-378.5

    Certificate from Freedom Diagnostics Testing, tier A · tested 2026-01-19

    • 3.0Certificate published (base)
    • +2.0Laboratory in our directory at tier A (Freedom Diagnostics Testing)
    • +1.5Verification key printed
    • +1.5Key confirmed at the laboratory's own site
    • +0.5Purity 99.926% (99.7% or higher)
    • 0.0Measured content 124% of label (90% of label or more)
  • Pinealon9.0

    Certificate from Freedom Diagnostics Testing, tier A · tested 2026-06-03

    • 3.0Certificate published (base)
    • +2.0Laboratory in our directory at tier A (Freedom Diagnostics Testing)
    • +1.5Verification key printed
    • +1.5Key confirmed at the laboratory's own site
    • +0.5Endotoxin test
    • +0.5Sterility test (USP <71> or a PCR / rapid sterility screen)
    • 0.0Purity 99.2% (99.0% up to but not including 99.7%)
    • 0.0Measured content 104.8% of label (90% of label or more)
  • Thymalin9.0

    Certificate from Freedom Diagnostics Testing, tier A · tested 2026-04-28

    • 3.0Certificate published (base)
    • +2.0Laboratory in our directory at tier A (Freedom Diagnostics Testing)
    • +1.5Verification key printed
    • +1.5Key confirmed at the laboratory's own site
    • +0.5Endotoxin test
    • +0.5Purity 99.76% (99.7% or higher)
    • 0.0Measured content 115.5% of label (90% of label or more)
  • PEG-MGF8.0

    Certificate from Freedom Diagnostics Testing, tier A · tested 2025-08-27

    • 3.0Certificate published (base)
    • +2.0Laboratory in our directory at tier A (Freedom Diagnostics Testing)
    • +1.5Verification key printed
    • +1.5Key confirmed at the laboratory's own site
    • 0.0Purity 99.1% (99.0% up to but not including 99.7%)
    • 0.0Measured content 105% of label (90% of label or more)
    • −0.044Age: more than 12 months old, so 0.25 × 8.0 ÷ the weighted product count comes off the mean (AGE below)
  • P-210.0

    No certificate on file for this product: scores 0, counted at 0.5 weight because it is not one of the core products.

  • HGH Fragment 176-1910.0

    No certificate on file for this product: scores 0, counted at 0.5 weight because it is not one of the core products.

  • SLU-PP-3328.5

    Certificate from Freedom Diagnostics Testing, tier A · tested 2026-05-22

    • 3.0Certificate published (base)
    • +2.0Laboratory in our directory at tier A (Freedom Diagnostics Testing)
    • +1.5Verification key printed
    • +1.5Key confirmed at the laboratory's own site
    • +0.5Endotoxin test
    • 0.0Purity 99.65% (99.0% up to but not including 99.7%)
    • 0.0Measured content 111% of label (90% of label or more)
  • MK-6778.5

    Certificate from Freedom Diagnostics Testing, tier A · tested 2026-05-19

    • 3.0Certificate published (base)
    • +2.0Laboratory in our directory at tier A (Freedom Diagnostics Testing)
    • +1.5Verification key printed
    • +1.5Key confirmed at the laboratory's own site
    • +0.5Endotoxin test
    • 0.0Purity 99.12% (99.0% up to but not including 99.7%)
    • 0.0Measured content 103.2% of label (90% of label or more)
  • Tesofensine8.5

    Certificate from Freedom Diagnostics Testing, tier A · tested 2026-05-22

    • 3.0Certificate published (base)
    • +2.0Laboratory in our directory at tier A (Freedom Diagnostics Testing)
    • +1.5Verification key printed
    • +1.5Key confirmed at the laboratory's own site
    • +0.5Endotoxin test
    • 0.0Purity 99.31% (99.0% up to but not including 99.7%)
    • 0.0Measured content 106.2% of label (90% of label or more)
  • Dihexa8.0

    Certificate from Freedom Diagnostics Testing, tier A · tested 2026-05-21

    • 3.0Certificate published (base)
    • +2.0Laboratory in our directory at tier A (Freedom Diagnostics Testing)
    • +1.5Verification key printed
    • +1.5Key confirmed at the laboratory's own site
    • 0.0No purity figure on the certificate
    • 0.0Measured content 125.6% of label (90% of label or more)

Weighted mean of 46 products (2 non-core products without a certificate counted at half weight): 392.5 ÷ 45.0 = 8.722.

  • −0.044AGE Certificates older than 12 months: 1 scored certificate(s) older than 12 months: peg-mgf 2025-08-27
  • −0.10CLAIM Claims the certificates do not support (cap −0.3): the About page and the 'Is Simple Peptide legit?' page say certificates issued from May 2026 onward include sterility, endotoxin, purity and net peptide content testing, but seven certificates received from May to September 2026 show no microbial or sterility result (semaglutide, cagrilintide, Melanotan II, oxytocin and thymosin alpha-1), and two of them (AOD-9604 of 3 June 2026 and 5-Amino-1MQ of 17 September 2026) show no endotoxin result either

8.722 − 0.144 = 8.578, rounded to 0.1: 8.6/10.

Testing gate: 44 of 46 products have a certificate from a directory laboratory (not tier D, not self-issued) with the key confirmed at the laboratory. That is at least half, so the vendor counts as third-party tested and no cap applies.

Shipping and refunds8.5/10
  • +3

    Returns and refunds

    "we offer a 30-day refund guarantee under the following conditions: Eligibility Product must be unopened, unused, and in original condition"; "Refund Requests Must be submitted within 30 days of the purchase date"; "Refunds are issued to the original payment method"

    Unopened returns are refunded within 30 days of purchase (rule B1: 3). The customer pays return shipping; opened products only case by case.

    simplepeptide.com (opens in new tab) source 2 (opens in new tab)checked

  • +2

    Lost or damaged parcels

    shipping: "In the event of a shipping related issue (such as delay, misdelivery, or loss) Simple Peptide can reship your package 7 business days after the original scheduled delivery date, and once we receive confirmation from the shipping carrier"; refund policy: "If there is an issue with the quality, shipping, or handling of your order (such as missing or damaged items) ... We will work swiftly to resolve the issue, including offering a replacement or refund where applicable."

    A reship is stated for lost parcels and a replacement or refund for damaged ones (rule B2: 2). The FAQ adds that damaged products are replaced with photo documentation. The store is not liable for parcels lost after the carrier confirms delivery.

    simplepeptide.com (opens in new tab) source 2 (opens in new tab) source 3 (opens in new tab)checked

  • +1.5

    Dispatch time

    "Orders placed before 2:00 PM Eastern Time (ET), Monday through Friday, ship the same day via 2nd Day Air."

    Same-day dispatch with a cutoff time (rule B3: 1.5).

    simplepeptide.com (opens in new tab)checked

  • +1

    Tracking on all orders

    "You'll receive a confirmation email with a tracking link as soon as your order ships."

    Rule B4: 1.

    simplepeptide.com (opens in new tab)checked

  • +1.5

    Payment you can dispute

    FAQ: "We accept major credit cards (Visa, MasterCard, American Express) and select business payment options."; site banner: "Pay by card or bank at checkout."

    Cards at checkout (rule B5: 1.5). Checkout was not reached (nothing added to a cart); the site's statements are scored.

    simplepeptide.com (opens in new tab)checked

  • 0

    Shipping rates published

    No shipping rate or free-shipping threshold is shown on the shipping, FAQ, cart or shop pages, signed in or not.

    A shipping rate appears only in the pages' structured data (schema.org OfferShippingDetails), which readers do not see, so nothing is published to readers (rule B6: 0). The 'free 2nd Day Air' wording on the site belongs to the sister brand Simple Cosmetics.

    simplepeptide.com (opens in new tab)checked

  • −0.5

    Policies that contradict each other

    Shipping & returns: "Orders can be modified or canceled within 30 minutes of purchase. After 30 minutes or once shipped, orders cannot be changed or canceled." Refund policy: "you must do so within 60 minutes of placing the order or before the item is packed. After this 60-minute window, no changes or cancellations can be made to the order." FAQ: "Orders can often be adjusted within 24 hours if they haven't shipped."

    Three pages give three different windows for cancelling or changing an order (rule B7). Each read twice on 2026-11-09. Evidence: evidence-local/2026-11-10/simple-peptide/CONTRADICTION.

    simplepeptide.com (opens in new tab) source 2 (opens in new tab) source 3 (opens in new tab)checked

Total +8.5: 8.5/10.

Pricing7.5/10

We compared Simple Peptide’s current single-vial prices on 42 products, each matched to the same product and milligrams per vial, with the median price of the other vendors. Its typical price (the median ratio across those products) is 7% below the market median (ratio 0.93), which the published scale maps to 7.5/10. checked

Operating history7.2/10

Counted from July 18, 2019, the earliest dated evidence of this business operating: 7.3 years as of November 9, 2026, which the published table maps to 7.2/10.

The site names its operating company, Melex Technologies Inc., which the Florida Division of Corporations records as a Florida profit corporation filed on 2019-07-18 and active (document P19000056045), so it counts from that date (an established operating company counts from its own start). The site says the business started small in 2019 and fully launched in 2023. The store domain simplepeptide.com was registered on 2023-12-19 (RDAP) and the Wayback Machine holds a capture of the store from 2024-05-20. No FDA warning letter to the business was found.

Transparency8.0/10

Total +8: 8.0/10.

  • Pricing: prices read 2026-11-09 (US Pacific) in a research account the owner created and signed in to in the PSR Chrome (the catalogue and prices are shown only to signed-in customers), from the store's own product data (/wp-json/wc/store/v1/products, 108 items) and the product pages. Named tirzepatide, retatrutide and semaglutide listings show an automatic 30% discount (Woo Discount Rules, no code, no stated end date or event), so at this first review the price a buyer pays today is used; the regular prices are in each row's notes. Codes (SIMPLE10, SAVE15, LIFESCIENCE5) are not counted. Capsule products are not compared; bacteriostatic water is excluded. r computed with pricingRatios against the listings at this commit; the merger's pricing-recompute will refresh it with the final medians.
  • Catalogue: 108 store items; 46 match our catalogue plus bacteriostatic water. GLP products are also listed under code names (SP-2TZ, SP-3RT, SP-1SG) at the same addresses as the named listings and at equal or higher prices; because named listings that state the compound exist, rule C9 (sold only under code names) does not apply. Not in our catalogue: Ultra-RT 'Ultratrutide', CagriSema, retatrutide/cagrilintide blend, orforglipron capsules, NMN, methylene blue, thymulin, FOXO4-DRI, PE-22-28, MGF, other blends, B12 products, skincare and devices.
Third-party tested: VerifiedLabs: Freedom Diagnostics TestingProducts tracked: 47

Shop Simple Peptide

  • Rated 8.32/10 · Strong
  • 44 COAs confirmed at the issuing lab
  • Best value: Glutathione at $0.05/mg
Visit Simple Peptide → (opens in new tab)

Simple Peptide shows prices and checkout only after you sign in or create an account.

Audit history and why the rating changed

We re-audit vendors against their live COAs and site. Here is what most recently moved this rating, and why.

See the full score history and chart

  1. Most recent audit · 8.30to8.32

    Market prices recalculated on 10 November 2026 after the second catalogue coverage check added 229 listings: pricing 7.4 to 7.5.

  2. Audit · Initial audit

    lab 8.6 / shipping 8.5 / pricing 7.4 / tenure 7.2 / transparency 8.0. First audit after the vendor's submission (reviewed 9 November 2026). 44 of 46 catalogue products have a Freedom Diagnostics Testing certificate, all confirmed with the laboratory; P21 and HGH Fragment 176-191 have none. CLAIM -0.1 for a test-panel claim that seven certificates do not bear out. Testing gate does not apply.

Editor’s notes

Simple Peptide sells research peptides from simplepeptide.com and ships within the United States only. It is owned and operated by Melex Technologies Inc., a Florida corporation registered in 2019, and names its founders, Alex and Melissa Ehrenthal. The only address it gives, in Delray Beach, Florida, is a mailbox at a shipping store, which the site itself calls a mail-order address with no walk-in location. It gives a phone number and dated terms under Florida law. Its catalogue and prices are shown only to signed-in customers, and we read them through an account. Of the 46 catalogue products we list, 44 have a published certificate from Freedom Diagnostics Testing, and we confirmed every one of them with the laboratory; for all but one the store's PDF is identical to the laboratory's own copy, and the one difference is a typo in a lot label. Certificates from mid-2026 onward add an endotoxin test and a PCR microbial screen. The site says certificates issued from May 2026 include sterility and endotoxin testing, but several certificates from May to September 2026, among them the newest ones for semaglutide, cagrilintide, AOD-9604 and 5-Amino-1MQ, do not show one or both of those tests. P21 and HGH Fragment 176-191 have no published certificate, and the PEG-MGF certificate is more than a year old. Unopened products can be returned for a refund within 30 days, a lost parcel can be reshipped once the carrier confirms the loss and a damaged one replaced, and weekday orders placed by 2 PM Eastern ship the same day with tracking. Cards are accepted at checkout. No shipping rate is shown to readers, and three pages give three different windows for cancelling an order. Named tirzepatide, retatrutide and semaglutide listings were 30% below their regular prices at our review, with no end date stated. In November 2026 prices sat about 5% below the market median.

Simple Peptide COAs and lab test results

One row per product: the certificate on file and how the lab rule reads it, the laboratory that issued it and its tier, the date it was tested, the purity it reports, and the lowest price per milligram we recorded (per IU or mL where a product is sold that way).

RetatrutideVerified (opens in new tab)

Freedom Diagnostics TestingTier Atested

Purity
99.96%
Price per mg
$6.55$314.30 / 48mgbest of 5 sizes
TirzepatideVerified (opens in new tab)

Freedom Diagnostics TestingTier Atested

Purity
99.73%
Price per mg
$2.44$146.30 / 60mgbest of 5 sizes
SemaglutideVerified (opens in new tab)

Freedom Diagnostics TestingTier Atested

Purity
99.91%
Price per mg
$6.51$65.10 / 10mg
CagrilintideVerified (opens in new tab)

Freedom Diagnostics TestingTier Atested

Purity
99.66%
Price per mg
$14.00$140.00 / 10mg
BPC-157Verified (opens in new tab)

Freedom Diagnostics TestingTier Atested

Purity
99.87%
Price per mg
$4.25$85.00 / 20mgbest of 3 sizes
BPC-157 + TB-500Verified (opens in new tab)

Freedom Diagnostics TestingTier Atested

Purity
99.12%
Price per mg
$3.30$99.00 / 30mgbest of 3 sizes
TB-500Verified (opens in new tab)

Freedom Diagnostics TestingTier Atested

Purity
99.505%
Price per mg
$6.50$65.00 / 10mgbest of 2 sizes
GHK-CuVerified (opens in new tab)

Freedom Diagnostics TestingTier Atested

Purity
99.97%
Price per mg
$0.55$55.00 / 100mg
GLOWVerified (opens in new tab)

Freedom Diagnostics TestingTier Atested

Purity
99.68%
Price per mg
$1.64$115.00 / 70mg
KLOWVerified (opens in new tab)

Freedom Diagnostics TestingTier Atested

Purity
99.54%
Price per mg
$1.75$140.00 / 80mg
TesamorelinVerified (opens in new tab)

Freedom Diagnostics TestingTier Atested

Purity
99.5%
Price per mg
$7.50$75.00 / 10mg
IpamorelinVerified (opens in new tab)

Freedom Diagnostics TestingTier Atested

Purity
99.77%
Price per mg
$6.50$65.00 / 10mg
CJC-1295Verified (opens in new tab)

Freedom Diagnostics TestingTier Atested

Purity
99.56%
Price per mg
$7.00$35.00 / 5mgbest of 2 sizes
CJC-1295 + IpamorelinVerified (opens in new tab)

Freedom Diagnostics TestingTier Atested

Purity
99.89%
Price per mg
$6.50$65.00 / 10mg
SelankVerified (opens in new tab)

Freedom Diagnostics TestingTier Atested

Purity
99.07%
Price per mg
$5.50$55.00 / 10mg
SemaxVerified (opens in new tab)

Freedom Diagnostics TestingTier Atested

Purity
99.43%
Price per mg
$5.50$55.00 / 10mg
Melanotan-2Verified (opens in new tab)

Freedom Diagnostics TestingTier Atested

Purity
99.83%
Price per mg
$3.80$38.00 / 10mg
Melanotan-1Verified (opens in new tab)

Freedom Diagnostics TestingTier Atested

Purity
99.79%
Price per mg
$4.50$45.00 / 10mg
PT-141Verified (opens in new tab)

Freedom Diagnostics TestingTier Atested

Purity
99.92%
Price per mg
$4.50$45.00 / 10mg
SermorelinVerified (opens in new tab)

Freedom Diagnostics TestingTier Atested

Purity
99.09%
Price per mg
$7.90$79.00 / 10mgbest of 2 sizes
MOTS-cVerified (opens in new tab)

Freedom Diagnostics TestingTier Atested

Purity
99.18%
Price per mg
$2.85$114.00 / 40mgbest of 2 sizes
NAD+Verified (opens in new tab)

Freedom Diagnostics TestingTier Atested

Purity
99.98%
Price per mg
$0.10$97.00 / 1000mgbest of 2 sizes
AOD-9604Verified (opens in new tab)

Freedom Diagnostics TestingTier Atested

Purity
99.78%
Price per mg
$8.00$80.00 / 10mgbest of 2 sizes
5-Amino-1MQVerified (opens in new tab)

Freedom Diagnostics TestingTier Atested

Purity
99.99%
Price per mg
$1.50$75.00 / 50mgbest of 2 sizes
IGF-1 LR3Verified (opens in new tab)

Freedom Diagnostics TestingTier Atested

Purity
99.71%
Price per mg
$60.00$60.00 / 1mg
KPVVerified (opens in new tab)

Freedom Diagnostics TestingTier Atested

Purity
99.88%
Price per mg
$4.50$45.00 / 10mg
Kisspeptin-10Verified (opens in new tab)

Freedom Diagnostics TestingTier Atested

Purity
99.788%
Price per mg
$4.50$45.00 / 10mg
EpitalonVerified (opens in new tab)

Freedom Diagnostics TestingTier Atested

Purity
99.55%
Price per mg
$3.30$33.00 / 10mg
Thymosin Alpha-1Verified (opens in new tab)

Freedom Diagnostics TestingTier Atested

Purity
99.61%
Price per mg
$8.60$86.00 / 10mg
GlutathioneVerified (opens in new tab)

Freedom Diagnostics TestingTier Atested

Purity
99.86%
Price per mg
$0.05$75.00 / 1500mg
DSIPVerified (opens in new tab)

Freedom Diagnostics TestingTier Atested

Purity
99.74%
Price per mg
$7.00$35.00 / 5mg
ARA-290Verified (opens in new tab)

Freedom Diagnostics TestingTier Atested

Purity
99.58%
Price per mg
$7.60$76.00 / 10mg
GHRP-6Verified (opens in new tab)

Freedom Diagnostics TestingTier Atested

Purity
99.796%
Price per mg
$3.90$39.00 / 10mg
GHRP-2Verified (opens in new tab)

Freedom Diagnostics TestingTier Atested

Purity
99.426%
Price per mg
$3.90$39.00 / 10mg
VIPVerified (opens in new tab)

Freedom Diagnostics TestingTier Atested

Purity
99.203%
Price per mg
$10.40$52.00 / 5mg
OxytocinVerified (opens in new tab)

Freedom Diagnostics TestingTier Atested

Purity
99.41%
Price per mg
$4.50$45.00 / 10mgbest of 2 sizes
LL-37Verified (opens in new tab)

Freedom Diagnostics TestingTier Atested

Purity
99.926%
Price per mg
$5.40$54.00 / 10mgbest of 2 sizes
PinealonVerified (opens in new tab)

Freedom Diagnostics TestingTier Atested

Purity
99.2%
Price per mg
$5.00$50.00 / 10mg
ThymalinVerified (opens in new tab)

Freedom Diagnostics TestingTier Atested

Purity
99.76%
Price per mg
$4.20$84.00 / 20mg
PEG-MGFVerified (opens in new tab)

Freedom Diagnostics TestingTier Atested

Purity
99.1%
Price per mg
$19.50$39.00 / 2mg
P-21No public COANo third-party COA was publicly available at audit time
Purity
—
Price per mg
$19.80$198.00 / 10mg
HGH Fragment 176-191No public COANo third-party COA was publicly available at audit time
Purity
—
Price per mg
$10.00$49.99 / 5mg
SLU-PP-332Verified (opens in new tab)

Freedom Diagnostics TestingTier Atested

Purity
99.65%
Price per mg
Gated
MK-677Verified (opens in new tab)

Freedom Diagnostics TestingTier Atested

Purity
99.12%
Price per mg
Gated
TesofensineVerified (opens in new tab)

Freedom Diagnostics TestingTier Atested

Purity
99.31%
Price per mg
Gated
DihexaVerified (opens in new tab)

Freedom Diagnostics TestingTier Atested

Purity
—
Price per mg
Gated
Bacteriostatic WaterLogin-gatedCOAs are provided but sit behind the vendor's login wall
Purity
—
Price per mL
Gated

Learn more about what Simple Peptide carries

Learn about Retatrutide →Learn about Tirzepatide →Learn about Semaglutide →Learn about BPC-157 →

Simple Peptide: Frequently Asked Questions

Is Simple Peptide legit?

Simple Peptide scores 8.32 out of 10 (Strong, #1 of 105) as of November 10, 2026 and passes our testing gate: 44 of the 46 products we score carry a certificate, 44 confirmed with the issuing lab (a lab we grade A). Its strongest area is lab testing (8.6/10); its weakest is operating history (7.2/10), with over seven years of records.

Is there a Simple Peptide promo code, coupon code, or discount code?

We do not have a verified Simple Peptide promo code or coupon code right now. When Simple Peptide runs a sale or issues a discount code, we post it here and on our promos page, so bookmark this page for the latest Simple Peptide discount.

Does Simple Peptide use third-party lab testing?

Yes. We have independently verified third-party COA evidence for this vendor. Laboratories on the certificates we hold: Freedom Diagnostics Testing.

Where can I see Simple Peptide's COAs?

In the "Simple Peptide COAs and lab test results" table on this page. We hold 44 certificates for Simple Peptide, covering 44 of the 47 products we track, issued by Freedom Diagnostics Testing. 44 products' certificates were confirmed at the issuing laboratory itself. Each row links the certificate, its lab, its test date and the purity it reports.

What peptides does Simple Peptide carry?

Simple Peptide carries Retatrutide, Tirzepatide, Semaglutide, Cagrilintide, BPC-157, BPC-157 + TB-500, TB-500, GHK-Cu, and 39 more. Current per-milligram pricing, COA links, and verification keys for each are in the comparison table on this page.

Is the Simple Peptide review on Peptide Source Review affected by affiliate status?

No. All affiliate relationships are publicly disclosed and never change a vendor's score, rank, or gate status. Our scoring formula is published in full and applied identically to every vendor.

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Simple Peptide8.32Strong

44 confirmed at the lab

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