QSC Qingdao Sigma Chemical
Vials tend to hold more than the label (median +7.5%); 1 of 17 vials was more than 10% under.
For research use only. VendorVerify sells nothing and takes no money from vendors. No affiliate links, no coupon codes, no paid rankings. How scores work
Every vial we have on file
- Within ±5% / purity 99%+
- 5–20% under, overfilled / purity 95–99%
- Failed: over 20% under, over 50% over, empty or under 95% pure
Dose vs label
17 vials measured · 0 emptyPurity
15 vials measured- Median purity
- 99.23%
- across 15 vials
- Median dose vs label
- +7.5%
- across 17 vials; + means more than the label
- Failed vials
- 7.3%
- 1 of 17 vials; the rate weights each lab report equally and recent reports more, as the score does
- Lab reports
- 15
- Nov 25, 2024 to Sep 17, 2026
Labs: Janoshik, Peptide Test, Prime Analytical Laboratories, LLC, QSC
Key facts
- VendorVerify holds third-party lab results for 17 QSC vials from 15 lab reports, dated Nov 2024 to Sep 2026.
- 1 of 17 QSC vials failed: empty, under 95% pure, more than 20% under the label or more than 50% over it.
- The median QSC vial tested at 99.23% purity across 15 vials with a purity result.
- The median QSC vial held +7.5% compared with its label across 17 vials where the lab measured the amount.
- Buyers have had 11 different compounds from QSC lab tested.
- QSC ranks #19 of 30 ranked vendors on the VendorVerify score.
- QSC vials on file were tested by Janoshik, Peptide Test, Prime Analytical Laboratories, LLC, QSC.
By peptide
| Peptide | Vials | Failed | Median purity | Median dose vs label | Dose vs label, −20% to +20% |
|---|---|---|---|---|---|
| Tirzepatide | 5 | 0 | 99.77% | +7.5% | |
| CJC-1295 | 2 | 1 | 94.70% | +0.2% | |
| NAD+ | 2 | 0 | — | +3.3% | |
| BPC-157 | 1 | 0 | 96.70% | +13.1% | |
| KPV | 1 | 0 | 98.61% | +6.0% | |
| Mazdutide | 1 | 0 | 98.88% | −3.5% | |
| Retatrutide | 1 | 0 | 98.34% | +19.5% | |
| Semaglutide | 1 | 0 | 99.57% | +13.7% | |
| Semax | 1 | 0 | 99.87% | +12.7% | |
| TB-500 | 1 | 0 | 98.99% | +8.0% | |
| Thymosin Alpha-1 | 1 | 0 | 99.44% | +0.5% |
Lab reports
One row per tested vial, newest first.
| Date | Peptide | Lab | Label | Measured | Dose vs label | Purity |
|---|---|---|---|---|---|---|
| Sep 17, 2026 | Thymosin Alpha-1Batch TA-1 10mg violet cap received Sept 2 2026 | Janoshik | 10 mg | 10.05 mg | +0.5% | 99.44% |
| Sep 17, 2026 | KPVBatch KPV 30mg purple cap received Sept 2 2026 | Janoshik | 30 mg | 31.8 mg | +6.0% | 98.61% |
| May 22, 2026 | MazdutideBatch white cap ordered April 2026 | Janoshik | 10 mg | 9.65 mg | −3.5% | 98.88% |
| Oct 21, 2025 | CJC-1295Batch No DAC; tested mod GRF 1-29 | Janoshik | 10 mg | 11.13 mg | +11.3% | 99.23% |
| Oct 6, 2025 | CJC-1295Batch No DAC White Cap | Peptide Test | 10 mg | 8.914 mg | −10.9% | 90.17% |
| Feb 7, 2025 | TirzepatideBatch Qschem-pharma Orange Cap | Peptide Test | 30 mg | 32.26 mg | +7.5% | 98.48% |
| Jan 24, 2025 | TirzepatideBatch Nov 26 Purple Cap | Janoshik | 30 mg | 31.45 mg | +4.8% | 99.79% |
| Jan 24, 2025 | TirzepatideBatch Nov 26 Purple Cap | Janoshik | 30 mg | 31.47 mg | +4.9% | 99.74% |
| Jan 17, 2025 | RetatrutideBatch Xmas 2024 Red caps | Prime Analytical Laboratories, LLC | 10 mg | 11.95 mg | +19.5% | 98.34% |
| Jan 16, 2025 | BPC-157Batch Yellow caps | Janoshik | 20 mg | 22.63 mg | +13.1% | 96.70% |
Other lab tests
Endotoxin, TFA, counterion and contaminant checks, as reported by the lab. They are shown for transparency and are not part of the score.
| Date | Peptide | Test | Result | Lab |
|---|---|---|---|---|
| Sep 15, 2026 | KPVBatch KPV 30mg purple cap received Sept 2 2026 | Endotoxin | <1 EU/Vial. | Janoshik |
| Sep 15, 2026 | Thymosin Alpha-1Batch TA-1 10mg violet cap received Sept 2 2026 | Endotoxin | <1 EU/Vial. | Janoshik |
| Dec 4, 2024 | TirzepatideBatch brown caps | TFA | 0 | Numega Labs |
QSC: common questions
Is QSC legit?
We can't vouch for any vendor as a business, and we don't sell or recommend products. What we can show is what buyers' independent lab tests found: 1 of 17 QSC vials on file failed, meaning they were empty, under 95% pure, more than 20% under the label or more than 50% over it. That places QSC #19 of 30 ranked vendors, below market on our score. Results on file run from Nov 2024 to Sep 2026.
Has QSC been third-party tested?
Yes. We hold results for 17 QSC vials from 15 lab reports, tested by Janoshik, Peptide Test, Prime Analytical Laboratories, LLC, QSC. Each result comes from a lab report a buyer paid for, not from a certificate the vendor supplied.
Are QSC vials dosed correctly?
Across 17 vials where the lab measured the amount, the median QSC vial held +7.5% compared with its label. 1 of 17 held more than 10% less than the label said.
How pure is QSC?
The median QSC vial tested at 99.23% purity across 15 vials with a purity result. We count anything under 95% as a failed vial, and a vial at 99.5% or higher gets full marks for purity.
Does QSC pay to be listed or ranked?
No. VendorVerify sells nothing and takes no money from vendors. No affiliate links, no coupon codes, no paid rankings. A vendor's place comes only from lab results.
Will my QSC vial match these results?
Not necessarily. A lab report describes the vials that were tested, and batches differ. A clean record lowers the odds of a bad vial but doesn't rule one out, which is why newer reports count for more in the score.
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