Simple Peptide vs Zeptix Labs
Two top US peptide sources scored on the identical published formula: lab credibility, shipping, pricing, operating history, and transparency.
- Simple Peptide
- 8.32/10
Simple Peptide
- Zeptix Labs
- 8.23/10
Zeptix Labs
Affiliate links: we may earn a commission if you buy. It never changes a score or rank.
Factor by factor
- 8.6Lab Credibilityweight 55%8.3
- 8.5Shipping & Refundweight 20%10.0
- 7.5Pricingweight 15%8.8
- 7.2Operating Historyweight 5%1.3
- 8.0Transparencyweight 5%5.5
- 44Certificates confirmed at the lab20
- 1Labs named on certificates2
Show as a table
| Category | Simple Peptide | Zeptix Labs |
|---|---|---|
| Lab Credibility | 8.6 | 8.3 |
| Shipping & Refund | 8.5 | 10.0 |
| Pricing | 7.5 | 8.8 |
| Operating History | 7.2 | 1.3 |
| Transparency | 8.0 | 5.5 |
| Overall | 8.32 | 8.23 |
Products both carry, price for price
| Peptide | Simple Peptideper unit | Zeptix Labsper unit |
|---|---|---|
| RetatrutideGuide → | $6.55/mg | $2.83/mg |
| TirzepatideGuide → | $2.44/mg | $3.67/mg |
| SemaglutideGuide → | $6.51/mg | $7.00/mg |
| Cagrilintide | $14.00/mg | $10.00/mg |
| BPC-157Guide → | $4.25/mg | $3.00/mg |
| BPC-157 + TB-500 | $3.30/mg | $5.00/mg |
| TB-500Guide → | $6.50/mg | $9.50/mg |
| GHK-CuGuide → | $0.55/mg | $0.40/mg |
| GLOW | $1.64/mg | $1.71/mg |
| KLOW | $1.75/mg | $0.87/mg |
| Tesamorelin | $7.50/mg | $5.00/mg |
| IpamorelinGuide → | $6.50/mg | $6.00/mg |
| CJC-1295 + Ipamorelin | $6.50/mg | $8.00/mg |
| Selank | $5.50/mg | $7.00/mg |
| Melanotan-2 | $3.80/mg | $5.00/mg |
| PT-141 | $4.50/mg | $4.50/mg |
| Sermorelin | $7.90/mg | $7.00/mg |
| MOTS-c | $2.85/mg | $3.00/mg |
| NAD+ | $0.10/mg | $0.18/mg |
| Epitalon | $3.30/mg | $3.00/mg |
| Bacteriostatic Water | — | $2.00/mL |
How they compare: the verdict
Simple Peptide takes this matchup by a razor-thin margin, 8.32 to 8.23 on the published formula. Its biggest edge is operating history, where it scores 7.2 against Zeptix Labs's 1.3.
It isn't a clean sweep. Zeptix Labs actually edges ahead on shipping & refunds (10.0 vs 8.5), so if that factor matters most to you it's worth weighing.
On lab evidence, the heaviest-weighted factor, both Simple Peptide and Zeptix Labs have independently verified third-party COAs, so the gap comes down to the other categories.
Across the 20 peptides both carry, pricing is evenly split (Simple Peptide 10, Zeptix Labs 10). The price-for-price table below has the detail, per mg (or per IU or mL for products sold that way).
Affiliate links: we may earn a commission if you buy. It never changes a score or rank.
Simple Peptide vs Zeptix Labs: FAQ
Simple Peptide or Zeptix Labs: which is better?
Simple Peptide takes this matchup by a razor-thin margin, 8.32 to 8.23 on the published formula. Its biggest edge is operating history, where it scores 7.2 against Zeptix Labs's 1.3. It isn't a clean sweep. Zeptix Labs actually edges ahead on shipping & refunds (10.0 vs 8.5), so if that factor matters most to you it's worth weighing. On lab evidence, the heaviest-weighted factor, both Simple Peptide and Zeptix Labs have independently verified third-party COAs, so the gap comes down to the other categories. Across the 20 peptides both carry, pricing is evenly split (Simple Peptide 10, Zeptix Labs 10). The price-for-price table below has the detail, per mg (or per IU or mL for products sold that way).
Do Simple Peptide and Zeptix Labs both use third-party testing?
Simple Peptide: independently verified third-party COAs. Zeptix Labs: independently verified third-party COAs.
How was this comparison scored?
Both vendors are scored on the identical published formula: lab credibility 55%, shipping 20%, pricing 15%, operating history 5%, transparency 5%. When third-party testing cannot be independently verified, a testing gate holds the score under a cap that starts at 6.0 and rises by at most 2.5 points for operating history, shipping and reviews. Neither vendor can pay to change a score.
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