Qingdao Sigma Chemical QSC reviews
41 independent lab tests across 4 products · 99.1% average purity
- 41 HPLC samples across 4 products
- Catalog avg purity 99.1%
- chat.peppys.org/c/vendor-posts/8 https://qsc-usa.com
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What the testing shows
Across 40 measured samples from Qingdao Sigma Chemical QSC, 12 came in more than 5% under the quantity on the label (30%). Another 14 measured more than 5% over. Purity across 41 readings ran from 93.9% to 99.95%, median 99.87%. Samples span Jul 2025 to Jul 2026.
- Under label
- 12/40
- Median purity
- 99.87%
- Latest sample
- Jul 2026
more than 5% short
93.9%–99.95% range
first tested Jul 2025
Lab testing results
Independent results across 4 products.
Tested products
| Product | Grade | Tests | Avg | Range | Latest | Price | $/mg |
|---|---|---|---|---|---|---|---|
| Tirzepatide | BGOOD | 17 | 82.3% | 99.1% – 99.9% | 6/8/2026 | — | — |
| GHK-Cu | DPOOR | 5 | 60.0% | 99.3% – 99.9% | 7/23/2026 | — | — |
| Retatrutide | DPOOR | 15 | 60.0% | 94.6% – 99.9% | 7/13/2026 | — | — |
| CJC-1295 | EBAD | 4 | 25.0% | 93.9% – 99.9% | 5/20/2026 | — | — |
Individual lab tests
Date
7/23/2026
Purity
99.9%
Quantity
50 mg → 45.9 mg
Lab
Krause Analytical
Vial
No label / Silver crimp / White cap
Date
7/13/2026
Purity
99.9%
Quantity
30 mg → 30.5 mg
Lab
Krause Analytical
Vial
No label / Silver crimp / Violet cap
Date
6/8/2026
Purity
99.9%
Quantity
60 mg → 66.6 mg
Lab
BTLabs
Vial
No label / Silver crimp / Clear Red cap
Date
5/27/2026
Purity
99.5%
Quantity
50 mg → 47.1 mg
Lab
Krause Analytical
Vial
No Label / Silver Crimp / Green Cap
Date
5/20/2026
Purity
99.9%
Quantity
5 mg → 4.96 mg
Lab
Krause Analytical
Vial
Clear label / Silver crimp / Red cap
Date
5/13/2026
Purity
99.3%
Quantity
100 mg → 89.3 mg
Lab
Krause Analytical
Vial
No Label / Silver Crimp / Blue Cap
Date
5/5/2026
Purity
99.9%
Quantity
30 mg → 31.3 mg
Lab
Krause Analytical
Vial
No Label / Silver Crimp / White Cap
Date
3/25/2026
Purity
99.9%
Quantity
60 mg → 69.2 mg
Lab
BTLabs
Vial
No Label / Silver Crimp / Red Cap
Date
3/25/2026
Purity
99.8%
Quantity
10 mg → 10.4 mg
Lab
BTLabs
Vial
No Label / Silver Crimp / Green Cap
Date
3/25/2026
Purity
99.9%
Quantity
30 mg → 32.5 mg
Lab
BTLabs
Vial
No Label / Silver Crimp / Gray Cap
Date
3/10/2026
Purity
99.9%
Quantity
100 mg → 86.6 mg
Lab
Krause Analytical
Vial
No Label / Silver Crimp / Blue Cap
Date
3/10/2026
Purity
99.9%
Quantity
10 mg → 9.86 mg
Lab
Krause Analytical
Vial
No Label / Silver Crimp / White Cap
Date
3/4/2026
Purity
99.6%
Quantity
100 mg → 151.5 mg
Lab
BTLabs
Vial
No Label / Silver Crimp / Blue Cap
Date
3/4/2026
Purity
99.9%
Quantity
30 mg → 26.7 mg
Lab
Krause Analytical
Vial
No Label / Silver Crimp / Violet Cap
Date
2/22/2026
Purity
99.28%
Quantity
20 mg → 20.6 mg
Lab
Krause Analytical
Vial
No Label / Silver Crimp / Clear Green Cap
Date
2/20/2026
Purity
99.9%
Quantity
10 mg → 14.7 mg
Lab
Krause Analytical
Vial
No Label / Silver Crimp / Green Cap
Date
2/20/2026
Purity
99.87%
Quantity
10 mg → 11.7 mg
Lab
Krause Analytical
Vial
White Label / Silver Crimp / Yellow Cap
Date
2/11/2026
Purity
99.9%
Quantity
45 mg → 48.6 mg
Lab
Krause Analytical
Vial
No Label / Silver Crimp / Black Cap
Date
1/26/2026
Purity
99.9%
Quantity
20 mg → 20.2 mg
Lab
Krause Analytical
Vial
No Label / Silver Crimp / Blue Cap
Date
1/26/2026
Purity
99.8%
Quantity
30 mg → 35.6 mg
Lab
BTLabs
Vial
No Label / Silver Crimp / Green Cap
Date
1/26/2026
Purity
99.9%
Quantity
30 mg → 31.9 mg
Lab
BTLabs
Vial
No Label / Silver Crimp / Orange Cap
Date
1/15/2026
Purity
99.8%
Quantity
10 mg → 11.2 mg
Lab
BTLabs
Vial
No Label / Silver Crimp / Yellow Cap
Date
1/15/2026
Purity
99.6%
Quantity
5 mg → 10 mg
Lab
BTLabs
Vial
No Label / Silver Crimp / Clear Blue Cap
Date
12/29/2025
Purity
99.6%
Quantity
10 mg → 10.2 mg
Lab
BTLabs
Vial
No Label / Silver Crimp / White Cap
Date
12/11/2025
Purity
99.48%
Quantity
15 mg → 14.9 mg
Lab
Krause Analytical
Vial
No Label / Silver Crimp / Orange Cap
Date
10/29/2025
Purity
98.32%
Quantity
20 mg → 17.3 mg
Lab
Krause Analytical
Vial
No Label / Silver Crimp / Clear Orange Cap
Date
10/29/2025
Purity
99.8%
Quantity
50 mg → 45.3 mg
Lab
Krause Analytical
Vial
No Label / Silver Crimp / Clear Yellow Cap
Date
10/21/2025
Purity
93.9%
Quantity
10 mg → 10.3 mg
Lab
Krause Analytical
Vial
White Label / Silver Crimp / White Cap
Date
10/21/2025
Purity
98.17%
Quantity
10 mg → 10.9 mg
Lab
Krause Analytical
Vial
White Label / Silver Crimp / Red Cap
Date
10/21/2025
Purity
99.95%
Quantity
75 mg → 86.2 mg
Lab
Krause Analytical
Vial
White Label / Silver Crimp / White Cap
Date
10/17/2025
Purity
99.37%
Quantity
10 mg → 10.5 mg
Lab
Krause Analytical
Vial
No Label / Silver Crimp / Orange Cap
Date
10/17/2025
Purity
95.99%
Quantity
20 mg → 17 mg
Lab
Krause Analytical
Vial
White Label / Silver Crimp / Orange Cap
Date
10/17/2025
Purity
99.95%
Quantity
50 mg → 54.8 mg
Lab
Krause Analytical
Vial
White Label / Silver Crimp / Yellow Cap
Date
10/17/2025
Purity
94.62%
Quantity
15 mg → 13.6 mg
Lab
Krause Analytical
Vial
No Label / Silver Crimp / Blue Cap
Date
10/17/2025
Purity
99.44%
Quantity
10 mg → 10.3 mg
Lab
Krause Analytical
Vial
White Label / Silver Crimp / Orange Cap
Date
10/3/2025
Purity
99.68%
Quantity
60 mg → 60.4 mg
Lab
Krause Analytical
Vial
No Label / Siver Crimp / Orange Cap
Date
9/18/2025
Purity
99.92%
Quantity
40 mg → 36.9 mg
Lab
Krause Analytical
Vial
No Label / Silver Crimp / White Cap
Date
7/2/2025
Purity
99.11%
Quantity
10 mg → 9.76 mg
Lab
Krause Analytical
Vial
No Label / Silver Crimp / Yellow Cap
| Product | Date | Score | Purity | Quantity | Lab | COA |
|---|---|---|---|---|---|---|
| GHK-CuNo label / Silver crimp / White cap | 7/23/2026 | 10.0 | 99.9% | 50 mg → 45.9 mg | Krause Analytical | View |
| RetatrutideNo label / Silver crimp / Violet cap | 7/13/2026 | 10.0 | 99.9% | 30 mg → 30.5 mg | Krause Analytical | View |
| TirzepatideNo label / Silver crimp / Clear Red cap | 6/8/2026 | 10.0 | 99.9% | 60 mg → 66.6 mg | BTLabs | View |
| TirzepatideNo Label / Silver Crimp / Green Cap | 5/27/2026 | 9.9 | 99.5% | 50 mg → 47.1 mg | Krause Analytical | View |
| CJC-1295Clear label / Silver crimp / Red cap | 5/20/2026 | 10.0 | 99.9% | 5 mg → 4.96 mg | Krause Analytical | View |
| GHK-CuNo Label / Silver Crimp / Blue Cap | 5/13/2026 | 9.9 | 99.3% | 100 mg → 89.3 mg | Krause Analytical | View |
| TirzepatideNo Label / Silver Crimp / White Cap | 5/5/2026 | 10.0 | 99.9% | 30 mg → 31.3 mg | Krause Analytical | View |
| TirzepatideNo Label / Silver Crimp / Red Cap | 3/25/2026 | 10.0 | 99.9% | 60 mg → 69.2 mg | BTLabs | View |
| TirzepatideNo Label / Silver Crimp / Green Cap | 3/25/2026 | 10.0 | 99.8% | 10 mg → 10.4 mg | BTLabs | View |
| TirzepatideNo Label / Silver Crimp / Gray Cap | 3/25/2026 | 10.0 | 99.9% | 30 mg → 32.5 mg | BTLabs | View |
| Retatrutide | 3/18/2026 | 10.0 | 99.9% | 10 mg → 11.3 mg | Krause Analytical | View |
| Retatrutide | 3/10/2026 | 10.0 | 99.9% | 30 mg → 27.9 mg | Krause Analytical | View |
| GHK-CuNo Label / Silver Crimp / Blue Cap | 3/10/2026 | 10.0 | 99.9% | 100 mg → 86.6 mg | Krause Analytical | View |
| RetatrutideNo Label / Silver Crimp / White Cap | 3/10/2026 | 10.0 | 99.9% | 10 mg → 9.86 mg | Krause Analytical | View |
| Tirzepatide | 3/10/2026 | 10.0 | 99.9% | 30 mg → 26.2 mg | Krause Analytical | View |
| GHK-CuNo Label / Silver Crimp / Blue Cap | 3/4/2026 | 10.0 | 99.6% | 100 mg → 151.5 mg | BTLabs | View |
| RetatrutideNo Label / Silver Crimp / Violet Cap | 3/4/2026 | 10.0 | 99.9% | 30 mg → 26.7 mg | Krause Analytical | View |
| RetatrutideNo Label / Silver Crimp / Clear Green Cap | 2/22/2026 | 9.9 | 99.28% | 20 mg → 20.6 mg | Krause Analytical | View |
| RetatrutideNo Label / Silver Crimp / Green Cap | 2/20/2026 | 10.0 | 99.9% | 10 mg → 14.7 mg | Krause Analytical | View |
| TirzepatideWhite Label / Silver Crimp / Yellow Cap | 2/20/2026 | 10.0 | 99.87% | 10 mg → 11.7 mg | Krause Analytical | View |
| RetatrutideNo Label / Silver Crimp / Black Cap | 2/11/2026 | 10.0 | 99.9% | 45 mg → 48.6 mg | Krause Analytical | View |
| TirzepatideNo Label / Silver Crimp / Blue Cap | 1/26/2026 | 10.0 | 99.9% | 20 mg → 20.2 mg | Krause Analytical | View |
| RetatrutideNo Label / Silver Crimp / Green Cap | 1/26/2026 | 10.0 | 99.8% | 30 mg → 35.6 mg | BTLabs | View |
| TirzepatideNo Label / Silver Crimp / Orange Cap | 1/26/2026 | 10.0 | 99.9% | 30 mg → 31.9 mg | BTLabs | View |
| RetatrutideNo Label / Silver Crimp / Yellow Cap | 1/15/2026 | 10.0 | 99.8% | 10 mg → 11.2 mg | BTLabs | View |
| CJC-1295No Label / Silver Crimp / Clear Blue Cap | 1/15/2026 | 10.0 | 99.6% | 5 mg → 10 mg | BTLabs | View |
| RetatrutideNo Label / Silver Crimp / White Cap | 12/29/2025 | 10.0 | 99.6% | 10 mg → 10.2 mg | BTLabs | View |
| RetatrutideNo Label / Silver Crimp / Orange Cap | 12/11/2025 | 9.9 | 99.48% | 15 mg → 14.9 mg | Krause Analytical | View |
| RetatrutideNo Label / Silver Crimp / Clear Orange Cap | 10/29/2025 | 9.8 | 98.32% | 20 mg → 17.3 mg | Krause Analytical | View |
| TirzepatideNo Label / Silver Crimp / Clear Yellow Cap | 10/29/2025 | 10.0 | 99.8% | 50 mg → 45.3 mg | Krause Analytical | View |
| CJC-1295White Label / Silver Crimp / White Cap | 10/21/2025 | 9.4 | 93.9% | 10 mg → 10.3 mg | Krause Analytical | View |
| CJC-1295White Label / Silver Crimp / Red Cap | 10/21/2025 | 9.8 | 98.17% | 10 mg → 10.9 mg | Krause Analytical | View |
| GHK-CuWhite Label / Silver Crimp / White Cap | 10/21/2025 | 10.0 | 99.95% | 75 mg → 86.2 mg | Krause Analytical | View |
| TirzepatideNo Label / Silver Crimp / Orange Cap | 10/17/2025 | 9.9 | 99.37% | 10 mg → 10.5 mg | Krause Analytical | View |
| RetatrutideWhite Label / Silver Crimp / Orange Cap | 10/17/2025 | 9.6 | 95.99% | 20 mg → 17 mg | Krause Analytical | View |
| TirzepatideWhite Label / Silver Crimp / Yellow Cap | 10/17/2025 | 10.0 | 99.95% | 50 mg → 54.8 mg | Krause Analytical | View |
| RetatrutideNo Label / Silver Crimp / Blue Cap | 10/17/2025 | 9.5 | 94.62% | 15 mg → 13.6 mg | Krause Analytical | View |
| TirzepatideWhite Label / Silver Crimp / Orange Cap | 10/17/2025 | 9.9 | 99.44% | 10 mg → 10.3 mg | Krause Analytical | View |
| TirzepatideNo Label / Siver Crimp / Orange Cap | 10/3/2025 | 10.0 | 99.68% | 60 mg → 60.4 mg | Krause Analytical | View |
| TirzepatideNo Label / Silver Crimp / White Cap | 9/18/2025 | 10.0 | 99.92% | 40 mg → 36.9 mg | Krause Analytical | View |
| TirzepatideNo Label / Silver Crimp / Yellow Cap | 7/2/2025 | 9.9 | 99.11% | 10 mg → 9.76 mg | Krause Analytical | View |
About Qingdao Sigma Chemical QSC
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