Vendor profile
Research · US · —
Qingdao Sigma Chemical QSC
B
Composite 7.4 / 10
Last updated 2026-10-05. Composite is computed from the live database; missing sub-scores redistribute weight across the others.
Peptide breakdown
| Peptide | Score | Lab quality | Tests | Purity | Qty var. | $/mg verified | Last test | Ranking |
|---|---|---|---|---|---|---|---|---|
| Tirzepatide | 8.1B+ |
8.3 | 18 | — | — | — | — | view |
| GHK-Cu | 7.9B+ |
8.2 | 6 | — | — | — | — | view |
| Retatrutide | 7.6B+ |
7.0 | 16 | — | — | — | — | view |
| BPC-157 | 5.8C |
4.8 | 3 | — | — | — | — | view |
| CJC-1295 | 3.9D |
2.9 | 4 | — | — | — | — | view |
| LL-37 | — |
— | 0 | — | — | — | — | view |
| Ipamorelin | — |
— | 0 | — | — | — | — | view |
| PT-141 | — |
— | 0 | — | — | — | — | view |
| TB-500 | — |
— | 0 | — | — | — | — | view |
| Tesamorelin | — |
— | 0 | — | — | — | — | view |
| MOTS-c | — |
— | 0 | — | — | — | — | view |
COA transparency
- ○ Publishes per-batch COAs (not just one COA for everyone) (pending)
- ○ Both HPLC and mass spec shown (pending)
- ○ Endotoxin or sterility data shown (pending)
- ○ At least one COA independently cross-checked (pending)
- ○ Most recent COA within 90 days (pending)
All vendor grades, side-by-side
Compare Qingdao Sigma Chemical QSC against every other vendor in the grade hub →
Top-5 ranked vendors per peptide, plus the highest-rated vendors overall. Daily refresh.