Ranked 6 of 20
Peptide Partners
The most heavily tested US retail vendor in independent databases, with a large certificate archive that re-checks at the issuing lab.
Overall score
85.9
Strong. Board median 77.9.
Score breakdown
-
Purity
40% weight85.3
7 of 8 samples passed
-
Trust
25% weight96
6 of 7 checks earned in full
-
Delivery
20% weight82
3 business day median
-
Value
15% weight76
0.94x the market median per mg
Transparency checks
Each check is worth a fixed number of points. Together they make up the trust score of 96.
- Certificates readable before checkout 20 / 20
- Lot on certificate matches the vial 20 / 20
- Testing lab named 12 / 12
- Certificate verifies at the lab 13 / 13
- Mass spec identity confirmation 10 / 10
- Trading history (3 years) 6 / 10
- No public enforcement actions 15 / 15
Facts
- Headquarters
- Not disclosed
- Ships from
- United States
- Trading since
- 2023
- Payments
- Cards, Crypto, Zelle
- Delivery
- 3 business day median, same-day dispatch before 2 PM ET
- Carriers
- USPS, UPS. Free over $150
- Testing labs
- Janoshik Analytical, MZ Biolabs
- Public reviews
- 4.6 average across 1,240 reviews
What stands out
- Largest public test history of any vendor on this list
- Certificates carry lot numbers that match the vial
- Both HPLC purity and mass spec identity on every batch
Where it falls short
- Company address is not published
- Results on a few long peptides have been uneven
Product by product
Rank is this vendor’s position among all vendors tested on that compound. Price is the listed vial normalised to dollars per milligram.
| Product | Rank | Avg purity | Tests | Price | Pass score |
|---|---|---|---|---|---|
| BPC-157 Latest Jul 30, 2026 | 17 | 99.12% | 0 / 1 | $6.80/mg $34 / 5 mg | 39.4 |
| Cagrilintide Latest Dec 15, 2025 | 3 | 99.61% | 1 / 1 | $12.6/mg $63 / 5 mg | 100.0 |
| GHK-Cu Latest Jun 11, 2026 | 4 | 99.83% | 1 / 1 | $0.58/mg $29 / 50 mg | 97.7 |
| Ipamorelin Latest Apr 22, 2026 | 3 | 99.66% | 1 / 1 | $5.80/mg $29 / 5 mg | 90.8 |
| Retatrutide Latest Oct 20, 2026 | 9 | 99.71% | 1 / 1 | $8.60/mg $86 / 10 mg | 100.0 |
| Semaglutide Latest Aug 14, 2026 | 4 | 99.58% | 1 / 1 | $9.80/mg $49 / 5 mg | 86.9 |
| TB-500 Latest Feb 9, 2026 | 8 | 99.55% | 1 / 1 | $8.20/mg $41 / 5 mg | 79.6 |
| Tirzepatide Latest Sep 28, 2026 | 2 | 99.64% | 1 / 1 | $6.80/mg $68 / 10 mg | 96.2 |
| CJC-1295 (no DAC) Listed, not yet tested | n/a | n/a | 0 | $7.60/mg $38 / 5 mg | n/a |
| NAD+ Listed, not yet tested | n/a | n/a | 0 | $0.11/mg $54 / 500 mg, out of stock | n/a |
| PT-141 Listed, not yet tested | n/a | n/a | 0 | $4.10/mg $41 / 10 mg | n/a |
| Tesamorelin Listed, not yet tested | n/a | n/a | 0 | $7.00/mg $70 / 10 mg | n/a |
- BPC-157 39.4
Rank 17, 0 of 1 passed, $6.80/mg
- Cagrilintide 100.0
Rank 3, 1 of 1 passed, $12.6/mg
- GHK-Cu 97.7
Rank 4, 1 of 1 passed, $0.58/mg
- Ipamorelin 90.8
Rank 3, 1 of 1 passed, $5.80/mg
- Retatrutide 100.0
Rank 9, 1 of 1 passed, $8.60/mg
- Semaglutide 86.9
Rank 4, 1 of 1 passed, $9.80/mg
- TB-500 79.6
Rank 8, 1 of 1 passed, $8.20/mg
- Tirzepatide 96.2
Rank 2, 1 of 1 passed, $6.80/mg
-
Rank n/a, 0 of 0 passed, $7.60/mg
- NAD+ n/a
Rank n/a, 0 of 0 passed, $0.11/mg
- PT-141 n/a
Rank n/a, 0 of 0 passed, $4.10/mg
- Tesamorelin n/a
Rank n/a, 0 of 0 passed, $7.00/mg
Test history
Every independent result we hold for Peptide Partners, newest first. Fill is the measured quantity as a share of the label claim.
- Retatrutide Janoshik Analytical Pass
- Tirzepatide Janoshik Analytical Pass
- Semaglutide MZ Biolabs Pass
- BPC-157 Janoshik Analytical Purity below 99.5%
- GHK-Cu MZ Biolabs Pass
- Ipamorelin Janoshik Analytical Pass
- TB-500 Janoshik Analytical Pass
- Cagrilintide MZ Biolabs Pass