Best Testagen Vendors
7 vendors we track carry Testagen. The 4 that pass our testing gate are ranked below by PSR score, with the certificate each one posts for Testagen, a price matched at 20mg and any reader code. For laboratory research use only.
- Carry it
- 7
Carry it
- Pass testing gate
- 4
Pass testing gate
- Lab-confirmed COAs
- 2
Lab-confirmed COAs
Want every carrier ordered by its Testagen certificate instead, with sizes and stock? See the full Testagen comparison. How a score is built: How we rate. How to check a certificate yourself: how to read a peptide COA.
Top 3 Testagen vendors by PSR score
The highest PSR scores among open stores that carry Testagen and pass our testing gate. Affiliate status plays no part in this list.
Affiliate links: we may earn a commission if you buy. It never changes a score or rank.
#1 by PSR score
Modern Aminos7.88Strong- Certificate
- Verified (opens in new tab)
- Lab
- Freedom Diagnostics TestingTier A
- Purity
- 99.5%
- Tested
- Price
- $2.70/mg ($54.00 for 20mg)
#2 by PSR score
BioLongevity Labs7.24Strong- Certificate
- Verified (opens in new tab)
- Lab
- BioRegenTier A
- Purity
- 99.83%
- Tested
- (first seen)
- Price
- $4.00/mg ($79.97 for 20mg)
#3 by PSR score
Hello Stacks6.14Fair- Certificate
- No public COANo third-party COA was publicly available at audit time
- Price
- $1.95/mg ($39.00 for 20mg)
Best Testagen vendors with a reader discount
Affiliate partners that pass the testing gate and give readers a code that applies to Testagen, in PSR score order. This block is a convenience only: the ranking below is the same with or without it.
Affiliate links: we may earn a commission if you buy. It never changes a score or rank.
- BioLongevity Labs7.24Strong
- Hello Stacks6.14FairNoneNo third-party COA was publicly available at audit time
- NextGen Peps5.95FairNoneNo third-party COA was publicly available at audit time
Every Testagen vendor that passes the gate, by PSR score
4 vendors, highest PSR score first; equal scores are listed alphabetically. Price per mg is matched at 20mg, the size most carriers sell, so vials compare like for like. The certificate column is the vendor’s certificate for Testagen only. Affiliate status never affects the order (how we keep it separate).
Affiliate links: we may earn a commission if you buy. It never changes a score or rank.
| # | Vendor | PSR score | Testagen certificate | $/mg at 20mg | Reader code | Links |
|---|---|---|---|---|---|---|
| 1 | Modern Aminos | 7.88Strong | Verified (opens in new tab) | $2.70/mg | Shop → | |
| 2 | BioLongevity Labs | 7.24Strong | Verified (opens in new tab) | $4.00/mg | Shop → | |
| 3 | Hello Stacks | 6.14Fair | NoneNo third-party COA was publicly available at audit time | $1.95/mg | Shop → | |
| 4 | NextGen Peps | 5.95Fair | NoneNo third-party COA was publicly available at audit time | $2.50/mg | Shop → |
Listed separately: 3 vendors outside the ranking
These carry Testagen but do not meet our testing gate, so they are never placed in the ranking above, whatever their score. The gate records what we could verify; it is not a finding of a quality or safety problem.
Show 3 vendors that fail the testing gate
| # | Vendor | PSR score | Testagen certificate |
|---|---|---|---|
| 1 | Swiss Chems | 5.39Weak | NoneNo third-party COA was publicly available at audit time |
| 2 | GenX Bio | 4.45Weak | Login-gatedCOAs are provided but sit behind the vendor's login wall |
| 3 | Peptara Labs | 2.38Poor | NoneNo third-party COA was publicly available at audit time |
Best Testagen vendors: frequently asked questions
Who is the best Testagen vendor?
By PSR score, Modern Aminos is the highest-rated open store carrying Testagen that passes our testing gate (7.88/10, Strong). BioLongevity Labs (7.24) and Hello Stacks (6.14) follow. The certificate each of them posts for Testagen is shown beside the score, so a reader can check it before buying.
Where can I buy Testagen with a discount code?
3 affiliate partners carrying Testagen pass our testing gate and give readers a code that applies to it. The highest rated is BioLongevity Labs (code PSR, 15% off). We may earn a commission on those links; it never changes a score or a rank.
How are these Testagen vendors ranked?
By PSR score, the published vendor score out of 10, built from lab testing, certificate verification, pricing, shipping, operating history and reviews under the rules on How We Rate. Equal scores are listed alphabetically. Price per mg and the certificate for Testagen are shown but do not change the order, and affiliate status never does.
Why are some Testagen vendors listed separately?
3 vendors carrying Testagen do not meet our testing gate: third-party testing could not be established or independently verified. They are listed below the ranking rather than in it. The gate records what we could verify; it is not a finding of a quality or safety problem.
How do I check a Testagen certificate of analysis?
Open the certificate from the vendor's row, confirm it names Testagen and a batch, then look up the verification key on the testing laboratory's own site. 2 of the 7 Testagen certificates we track were confirmed at the lab. Our guide on how to read a peptide COA walks through each field. For laboratory research use only.