Red-Flag Watchlist
Where the supply chain is failing. These vendors and results carry the highest risk in our database as of 28 May 2026 — underdosed, overdosed, impure or simply not what the label claims.
12
Vendors rated E
21
Rated D or E
25
Critical failures
88
Large deviations
Vendors on the watchlist
| Vendor | Rating range | Worst grade | Avg | Tests | Products | Spread |
|---|---|---|---|---|---|---|
| HK Peptides | A A to E | E | 7.0 | 343 | 11 | 4 grades |
| Qing Li Peptide | A A to E | E | 6.9 | 260 | 13 | 4 grades |
| ZLZ Peptide | A A to E | E | 6.8 | 199 | 9 | 4 grades |
| Oupeptide | A A to E | E | 6.7 | 149 | 8 | 4 grades |
| Peptide-S | A A to E | E | 7.2 | 125 | 11 | 4 grades |
| Peptide Sciences | A A to E | E | 6.8 | 123 | 10 | 4 grades |
| Tianjin Ruiwang New Material Technology Co | A A to E | E | 7.3 | 107 | 6 | 4 grades |
| Yiwu Aozuo Trading Co | A A to E | E | 7.8 | 91 | 8 | 4 grades |
| Skye Peptides | A A to E | E | 7.1 | 73 | 10 | 4 grades |
| Uther | A A to E | E | 7.5 | 69 | 13 | 4 grades |
| Paramount Peptides | A A to E | E | 6.7 | 65 | 8 | 4 grades |
| Suaway Lab Research | A A to E | E | 5.4 | 39 | 8 | 4 grades |
| Amino Amigos | A A to E | E | 5.6 | 37 | 6 | 4 grades |
| Biolongevity Labs | A A to E | E | 6.0 | 33 | 5 | 4 grades |
| Loti Labs | A A to E | E | 5.0 | 32 | 6 | 4 grades |
| Injectify | A A to E | E | 7.3 | 29 | 6 | 4 grades |
| Heman Peptide HM | A A to E | E | 6.9 | 29 | 3 | 4 grades |
| Astro Peptides | A A to E | E | 6.6 | 29 | 4 | 4 grades |
| Deuschem | A A to E | E | 4.1 | 29 | 7 | 4 grades |
| Zenith Jove Peptide ZJ | A A to E | E | 7.0 | 26 | 2 | 4 grades |
| Forever Young Pharmacy | A A to E | E | 5.8 | 26 | 5 | 4 grades |
| Coastal Peptides | A A to E | E | 4.7 | 26 | 5 | 4 grades |
| Shandong Shengyuan Peptide Technology | A A to E | E | 7.5 | 24 | 2 | 4 grades |
| Bulk Peptide Supply | A A to E | E | 7.7 | 20 | 5 | 4 grades |
Worst recent results
| Date | Product | Vendor | Score | Note |
|---|---|---|---|---|
| 24 May 2026 | Tirzepatide | Shenzhen Jiechuang Trading | 0.0 | Compound not detected |
| 24 May 2026 | Tesamorelin | Oupeptide | 0.8 | -99.5% |
| 24 May 2026 | Tirzepatide | Mix Peptides | 1.4 | |
| 24 May 2026 | Tirzepatide | TSC Top Supplements China | 1.6 | -47.6% |
| 23 May 2026 | Tirzepatide | Zenith Jove Peptide ZJ | 0.0 | Compound not detected |
| 21 May 2026 | Tirzepatide | ZZQ Peptides | 1.3 | -69.5% |
| 21 May 2026 | Tirzepatide | Allen Biotechnology Co ABC | 2.0 | Compound not detected |
| 29 Jan 2026 | Retatrutide | Shaanxi Dideu Medichem | 0.0 | Compound not detected |
| 29 Jan 2026 | Tirzepatide | Shandong Shengyuan Peptide Technology | 2.0 | Compound not detected |
| 29 Dec 2025 | Tirzepatide | Hangzhou Youngpeptide Biotechnology HYB | 0.0 | Compound not detected |
| 22 Dec 2025 | Retatrutide | Changan District Sheng Peptide Trading | 0.0 | Compound not detected |
| 25 Nov 2025 | BPC-157 | YB Peptide | 0.0 | Compound not detected |
| 23 Oct 2025 | Tirzepatide | Qingdao VitaConin International Trading | 1.9 | -27.3% |
| 17 Oct 2025 | Tirzepatide | Qingdao Hongshengda Trading | 2.0 | Compound not detected |
| 5 Oct 2025 | Retatrutide | Xingtai Lesda Technology | 0.0 | Compound not detected |
| 5 Sep 2025 | Ipamorelin | Biolabshop Limited | 2.0 | +20.0% |