Best sources ranked · 2026

Best Thymosin Alpha-1 Sources

38 US vendors carry Thymosin Alpha-1. Ordered below by the lab-rule score of each vendor’s certificate for Thymosin Alpha-1, then by the vendor’s published score; prices are per milligram. A 28-amino-acid peptide fragment of prothymosin alpha, originally isolated from thymus tissue. Sold for laboratory research use only.

Reviewed by the Peptide Source Review teamLast audited How we rate

Vendors
38

Vendors

With COAs
29

With COAs

Best $/mg
$2.19

Best $/mg

Every Thymosin Alpha-1 source, by certificate

Ordered by the lab-rule score of each vendor's certificate for this product (out of 10), then by the vendor's published score, then alphabetically. How the lab rule scores a certificate. For the market-wide picture, see our 2026 study of peptide vendor testing.

Affiliate links: we may earn a commission if you buy. It never changes a score or rank.

1Southern Aminos
9.5/103 base, +2 Freedom Diagnostics Testing tier A, +1.5 key, +1.5 key confirmed, +0.5 endotoxin, +0.5 sterility, +0.5 purity 99.901certificate

Vendor score 8.09/10Strong

Verified (opens in new tab)Freedom Diagnostics TestingTier A
Price per mg
$6.00
Best price
$60.00 / 10mg
Shop Southern Aminos → (opens in new tab)
2Amino Club
9.5/103 base, +2 ILS Laboratories tier B+, +1.5 key, +1.5 key confirmed, +0.5 endotoxin, +0.5 sterility, +0.5 purity 99.92certificate

Vendor score 8.02/10Strong

Verified (opens in new tab)ILS LaboratoriesTier B+
Price per mg
$4.00
Best price
$39.99 / 10mg
Shop Amino Club → (opens in new tab)
3S1Research
9.5/103 base, +2 Freedom Diagnostics Testing tier A, +1.5 key, +1.5 key confirmed, +0.5 endotoxin, +0.5 sterility, +0.5 purity 99.95certificate

Vendor score 7.75/10Strong

Verified (opens in new tab)Freedom Diagnostics TestingTier A
Price per mg
$3.85
Best price
$38.50 / 10mg
Shop S1Research → (opens in new tab)
4LabFirst Peptides
9.5/103 base, +2 Kovera Labs tier A-, +1.5 key, +1.5 key confirmed, +0.5 endotoxin, +0.5 sterility, +0.5 purity 99.703certificate

Vendor score 7.73/10Strong

Verified (opens in new tab)Kovera LabsTier A-
Price per mg
$13.00
Best price
$130.00 / 10mg
Shop LabFirst Peptides → (opens in new tab)
5Limitless Biotech
9.5/103 base, +2 MZ Biolabs tier A, +1.5 key, +1.5 key confirmed, +0.5 endotoxin, +0.5 sterility, +0.5 purity 99.84certificate

Vendor score 6.97/10Fair

Verified (opens in new tab)MZ BiolabsTier A
Price per mg
$13.20
Best price
$131.99 / 10mg
Shop Limitless Biotech → (opens in new tab)
6Ascension Peptides
9.0/103 base, +2 Kovera Labs tier A-, +1.5 key, +1.5 key confirmed, +0.5 endotoxin, +0.5 sterility, 0 purity 99.394certificate

Vendor score 7.55/10Strong

Verified (opens in new tab)Kovera LabsTier A-
Price per mg
$7.10
Best price
$71.00 / 10mg
Shop Ascension Peptides → (opens in new tab)
7Direct Peptides
8.5/103 base, +2 Horizon Analytical tier A-, +1.5 key, +1.5 key confirmed, +0.5 endotoxin, 0 purity 99.42certificate

Vendor score 7.43/10Strong

Verified (opens in new tab)Horizon AnalyticalTier A-
Price per mg
$9.90
Best price
$99.00 / 10mg
Shop Direct Peptides → (opens in new tab)
8Bluum Peptides
8.5/103 base, +2 Freedom Diagnostics Testing tier A, +1.5 key, +1.5 key confirmed, +0.5 purity 99.82certificate

Vendor score 7.37/10Strong

Verified (opens in new tab)Freedom Diagnostics TestingTier A
Price per mg
$11.80
Best price
$59.00 / 5mg
Shop Bluum Peptides → (opens in new tab)
9BioLongevity Labs
8.5/103 base, +2 BioRegen tier A, +1.5 key, +1.5 key confirmed, +0.5 purity 99.91certificate

Vendor score 7.24/10Strong

Verified (opens in new tab)BioRegenTier A
Price per mg
$13.00
Best price
$129.97 / 10mg
Shop BioLongevity Labs → (opens in new tab)
10Pacific Edge Labs
8.5/103 base, +2 Freedom Diagnostics Testing tier A, +1.5 key, +1.5 key confirmed, +0.5 purity 99.82certificate

Vendor score 7.15/10Strong

Verified (opens in new tab)Freedom Diagnostics TestingTier A
Price per mg
$9.00
Best price
$89.95 / 10mg
Shop Pacific Edge Labs → (opens in new tab)
Show 28 more carriers
11StudzPeptides
8.5/103 base, +2 Freedom Diagnostics Testing tier A, +1.5 key, +1.5 key confirmed, +0.5 purity 99.85certificate

Vendor score 6.99/10Fair

Verified (opens in new tab)Freedom Diagnostics TestingTier A
Price per mg
$4.30
Best price
$42.99 / 10mg
Shop StudzPeptides → (opens in new tab)
12Peptyes
8.5/103 base, +2 Horizon Analytical tier A-, +1.5 key, +1.5 key confirmed, +0.5 endotoxin, 0 purity 99.32certificate

Vendor score 6.55/10Fair

Verified (opens in new tab)Horizon AnalyticalTier A-
Price per mg
$12.60
Best price
$126.00 / 10mg
Shop Peptyes → (opens in new tab)
13Hello Stacks
8.5/103 base, +2 Vanguard Laboratory tier B+, +1.5 key, +1.5 key confirmed, +0.5 endotoxin, 0 purity 99.1certificate

Vendor score 6.14/10Fair

Verified (opens in new tab)Vanguard LaboratoryTier B+
Price per mg
$7.90
Best price
$79.00 / 10mg
Shop Hello Stacks → (opens in new tab)
14NextGen Peps
8.5/103 base, +2 Bioviridian tier A-, +1.5 key, +1.5 key confirmed, +0.5 endotoxin, 0 purity 99.58certificate

Vendor score 5.95/10Fair

Verified (opens in new tab)BioviridianTier A-
Price per mg
$6.70
Best price
$67.00 / 10mg
Shop NextGen Peps → (opens in new tab)
15Peptide Pro
8.5/103 base, +2 Bioviridian tier A-, +1.5 key, +1.5 key confirmed, +0.5 purity 99.78certificate

Vendor score 5.60/10Fair

Verified (opens in new tab)BioviridianTier A-
Price per mg
$8.07
Best price
$80.74 / 10mg
Shop Peptide Pro → (opens in new tab)
16Azyrion Labs
8.5/103 base, +2 Freedom Diagnostics Testing tier A, +1.5 key, +1.5 key confirmed, +0.5 purity 99.76certificate

Vendor score 5.45/10Weak

Verified (opens in new tab)Freedom Diagnostics TestingTier A
Price per mg
$9.80
Best price
$97.99 / 10mg
Shop Azyrion Labs → (opens in new tab)
17Ameano Peptides
8.0/103 base, +2 Janoshik Analytical tier B+, +1.5 key, +1.5 key confirmed, 0 purity 99.68certificate

Vendor score 7.80/10Strong

Verified (opens in new tab)Janoshik AnalyticalTier B+
Price per mg
$6.20
Best price
$62.00 / 10mg
Shop Ameano Peptides → (opens in new tab)
18NuuVive Peptides
8.0/103 base, +2 Janoshik Analytical tier B+, +1.5 key, +1.5 key confirmed, 0 purity 99.311certificate

Vendor score 6.93/10Fair

Verified (opens in new tab)Janoshik AnalyticalTier B+
Price per mg
$11.50
Best price
$115.00 / 10mg
Shop NuuVive Peptides → (opens in new tab)
19Rogue Compounds
8.0/103 base, +2 ILS Laboratories tier B+, +1.5 key, +1.5 key confirmed, 0 purity 99.23certificate

Vendor score 6.88/10Fair

Verified (opens in new tab)ILS LaboratoriesTier B+
Price per mg
$8.50
Best price
$84.99 / 10mg
Shop Rogue Compounds → (opens in new tab)
20VoriLabs
8.0/103 base, +2 Freedom Diagnostics Testing tier A, +1.5 key, +1.5 key confirmed, 0 purity 99.6certificate

Vendor score 6.87/10Fair

Verified (opens in new tab)Freedom Diagnostics TestingTier A
Price per mg
$12.10
Best price
$120.99 / 10mg
Shop VoriLabs → (opens in new tab)
21FRO Peptides
8.0/103 base, +2 Accumark Labs tier B+, +1.5 key, +1.5 key confirmed, 0 purity 99.18certificate

Vendor score 6.50/10Fair

Verified (opens in new tab)Accumark LabsTier B+
Price per mg
$8.00
Best price
$79.99 / 10mg
Shop FRO Peptides → (opens in new tab)
22NextSelf Labs
8.0/103 base, +2 ILS Laboratories tier B+, +1.5 key, +1.5 key confirmed, 0 purity 99.1certificate

Vendor score 6.26/10Fair

Verified (opens in new tab)ILS LaboratoriesTier B+
Price per mg
$8.00
Best price
$79.99 / 10mg
Shop NextSelf Labs → (opens in new tab)
23GhostLabz
8.0/103 base, +2 ILS Laboratories tier B+, +1.5 key, +1.5 key confirmed, 0 purity 99.1certificate

Vendor score 6.14/10Fair

Verified (opens in new tab)ILS LaboratoriesTier B+
Price per mg
$6.50
Best price
$64.99 / 10mg
Shop GhostLabz → (opens in new tab)
24Prime Peptide Solutions
6.5/103 base, +2 BT Labs tier B, +1.5 key, 0 purity 99.6certificate

Vendor score 7.14/10Strong

View (opens in new tab)BT LabsTier B
Price per mg
$7.00
Best price
$69.99 / 10mg
Shop Prime Peptide Solutions → (opens in new tab)
25AminoVault
5.5/103 base, +2 MDx BioAnalytical Laboratory tier A+, +0 accreditation (tested 2025-10-15, before 2026-06-09), +0.5 purity 99.8certificate

Vendor score 5.78/10Fair

Verified (opens in new tab)MDx BioAnalytical LaboratoryTier A+
Price per mg
$8.42
Best price
$84.15 / 10mg
Shop AminoVault → (opens in new tab)
26Vyal Labs
5.5/103 base, +2 Accurate Test Lab tier B-, +0.5 purity 99.83certificate

Vendor score 4.70/10Weak

View (opens in new tab)Accurate Test LabTier B-
Price per mg
$13.90
Best price
$139.00 / 10mg
Shop Vyal Labs → (opens in new tab)
27Based Research
4.5/103 base, +0 Analytical Formulations tier C, +1.5 key, 0 purity 99.5certificate

Vendor score 4.54/10Weak

View (opens in new tab)Analytical FormulationsTier C
Price per mg
$14.90
Best price
$149.00 / 10mg
Shop Based Research → (opens in new tab)
28Swiss Chems
2.0/10no laboratory named on the certificate = 2.0 flatcertificate

Vendor score 5.39/10Weak

No lab named (opens in new tab)
Price per mg
—
Best price
—
Shop Swiss Chems → (opens in new tab)
29Redline Bio Labs
2.0/10SteriGenix Analytical tier D: independence not established = 2.0 flatcertificate

Vendor score 4.80/10Weak

Vendor report (lab not established) (opens in new tab)SteriGenix AnalyticalTier D
Price per mg
$6.50
Best price
$65.00 / 10mg
Shop Redline Bio Labs → (opens in new tab)
30Prism Labs
2.0/10Proof Point Analytical tier D: independence not established = 2.0 flatcertificate

Vendor score 3.92/10Poor

Vendor report (lab not established) (opens in new tab)Proof Point AnalyticalTier D
Price per mg
$10.00
Best price
$49.99 / 5mg
Shop Prism Labs → (opens in new tab)
31BioInfinity
2.0/10Verum Analytics tier D: independence not established = 2.0 flatcertificate

Vendor score 3.70/10Poor

Vendor report (lab not established) (opens in new tab)Verum AnalyticsTier D
Price per mg
$13.00
Best price
$130.00 / 10mg
Shop BioInfinity → (opens in new tab)
32GenX Bio
0.0/10no certificatecertificate

Vendor score 4.45/10Weak

Login-gatedCOAs are provided but sit behind the vendor's login wall
Price per mg
$14.67
Best price
$44.00 / 3mg
Shop GenX Bio → (opens in new tab)
33Spartan Peptides
0.0/10no certificatecertificate

Vendor score 3.38/10Poor

NoneNo third-party COA was publicly available at audit time
Price per mg
$19.80
Best price
$99.00 / 5mg
Shop Spartan Peptides → (opens in new tab)
34RapidCore Bio
0.0/10no certificatecertificate

Vendor score 3.25/10Poor

NoneNo third-party COA was publicly available at audit time
Price per mg
$11.00
Best price
$110.00 / 10mg
Shop RapidCore Bio → (opens in new tab)
35Stack Research
0.0/10posted copy differs from the lab's copy = 0certificate

Vendor score 2.51/10Poor

View COA (differs from lab copy) (opens in new tab)Accumark LabsTier B+
Price per mg
—
Best price
—
Shop Stack Research → (opens in new tab)
36Peptara Labs
0.0/10no certificatecertificate

Vendor score 2.38/10Poor

NoneNo third-party COA was publicly available at audit time
Price per mg
—
Best price
—
Shop Peptara Labs → (opens in new tab)
37Welon Peptide Solutions
0.0/10no certificatecertificate

Vendor score 2.13/10Poor

NoneNo third-party COA was publicly available at audit time
Price per mg
$2.19
Best price
$219.00 / 10 x 10mg pack
Shop Welon Peptide Solutions → (opens in new tab)
38Medura Peptides
0.0/10no certificatecertificate

Vendor score 1.63/10Poor

NoneNo third-party COA was publicly available at audit time
Price per mg
$15.30
Best price
$152.99 / 10mg
Shop Medura Peptides → (opens in new tab)

“Shop” links may be affiliate links (rel="sponsored"); we may earn a commission. Affiliate status never affects any rating, rank, or gate. Disclosure.

Affiliate partners carrying Thymosin Alpha-1

Affiliate links: we may earn a commission if you buy. It never changes a score or rank.

Highest-placed partner

Amino Club9.5/10 certificate

The highest-placed affiliate partner in the table above for Thymosin Alpha-1: certificate 9.5/10, vendor score 8.02/10.

Shop Amino Club → (opens in new tab)

Largest partner reader code

Ascension Peptides50% off

The largest reader discount among our affiliate partners carrying Thymosin Alpha-1: 50% off with code PSR50.

Shop Ascension Peptides → (opens in new tab)
Ascension Peptides discount code →

Thymosin Alpha-1: Frequently Asked Questions

Who has the best Thymosin Alpha-1?

In our 2026 audit, Southern Aminos is listed first for Thymosin Alpha-1: its certificate for Thymosin Alpha-1 scores 9.5/10 on our lab rule, and its published vendor score is 8.09/10. The full ordered table is on this page.

What is the cheapest Thymosin Alpha-1 per mg?

The lowest recorded price per milligram for Thymosin Alpha-1 in our audit is the "Best $/mg" figure at the top of this page, and every carrier's price per mg is in the table. Cheapest is not the same as best: the table is ordered by certificate and vendor score, not by price.

How do you rate Thymosin Alpha-1 vendors?

Ordered by the lab-rule score of each vendor's certificate for this product (out of 10), then by the vendor's published score, then alphabetically. The certificate score is the same lab rule that builds each vendor's lab sub-score, applied to that vendor's certificate for Thymosin Alpha-1; the vendor score is the published overall score. Price per mg is shown but does not change the order. See our methodology for the lab rule.

Also available at these peptide pages

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