Qingdao Sigma Chemical QSC reviews
Qingdao Sigma Chemical QSC reviews: 50 independent lab tests across 6 products, with a mixed lab record.
Written by the Peptide Vendor Reviews editorial team
Is Qingdao Sigma Chemical QSC legit? Lab record: Mixed
How we rate- 50 independent tests
- 36 of 49 lots filled to label
- Median purity 99.8%
- 4 of 5 products graded D or E
Some of Qingdao Sigma Chemical QSC's products graded D or E. The shops below tested A or B for the same peptides.
Better-tested BPC-157
Qingdao Sigma Chemical QSC graded E. Zenith Jove Peptide ZJ's BPC-157 graded A across 10 tests.
Buy from Zenith Jove Peptide ZJAll better-tested optionsPeptide Vendor Reviews independently tests products and verifies reviews. Public methodology, no pay-to-rank.
Better-tested options
Where Qingdao Sigma Chemical QSC graded D or E, these shops' samples of the same peptide graded A or B. Ordered by grade, then price per mg. Partner status never changes the order.
Qingdao Sigma Chemical QSC products we've tested
Best-graded first. Grades come from the share of each product's samples that passed purity and quantity checks. Buy links open Qingdao Sigma Chemical QSC's site.
- TirzepatideBGOOD
- Tests
- 18
- Passed
- 83.3%
- RetatrutideDPOOR
- Tests
- 17
- Passed
- 64.7%
- GHK-CuDPOOR
- Tests
- 6
- Passed
- 66.7%
- BPC-157EBAD
- Tests
- 4
- Passed
- 50.0%
- CJC-1295EBAD
- Tests
- 4
- Passed
- 25.0%
- HGH—
- Tests
- 1
- Passed
- —
What the testing shows
Across 49 measured samples from Qingdao Sigma Chemical QSC, 13 came in more than 5% under the quantity on the label (27%). Another 17 measured more than 5% over. Purity across 50 readings ran from 93.9% to 99.95%, median 99.8%. Samples span Jul 2025 to Oct 2026.
- Under label
- 13/49
- Median purity
- 99.8%
- Latest sample
- Oct 2026
more than 5% short
93.9%–99.95% range
first tested Jul 2025
Our read on Qingdao Sigma Chemical QSC
33 of Qingdao Sigma Chemical QSC's 50 graded samples passed (66%), and 100% of all samples were sent in by buyers rather than by the shop.
Results are improving: 85% passed over the latest six months, up from 59% before.
When a sample failed, the most common reason was purity under 99.5% (14 times).
Against the 302 shops with at least five graded tests, Qingdao Sigma Chemical QSC's pass rate is at or above 33% of them, and it has more tests on record than 79% of them.
When and how Qingdao Sigma Chemical QSC was tested
Samples per month. The darker part of each bar failed.
- Labs used
- Krause Analytical (35), BTLabs (14), Harrens Lab (1)
- Who sent the samples
- buyers 100%
- Batches covered
- 26 distinct batch numbers; 6 checked for endotoxins
Why Qingdao Sigma Chemical QSC's failed samples failed
The 6 most recent failed tests, with the lab's reason.
HGH · Jul 13, 2026
purity under 99.5%
GHK-Cu · May 13, 2026
purity under 99.5%
GHK-Cu · Mar 4, 2026
amount in the vial more than 35% off the label
Retatrutide · Feb 22, 2026
purity under 99.5%
Retatrutide · Feb 20, 2026
amount in the vial more than 35% off the label
BPC-157 · Feb 2, 2026
purity under 99.5%
Lab testing results
Independent results across 6 products.
Individual lab tests
Date
10/6/2026
Purity
99.6%
Quantity
20 mg → 22.8 mg
Lab
BTLabs
Vial
No label / Silver crimp / Clear Blue cap
Date
9/30/2026
Purity
99.9%
Quantity
30 mg → 29.99 mg
Lab
Harrens Lab
Vial
No label / Silver crimp / Violet cap
Date
9/16/2026
Purity
99.9%
Quantity
60 mg → 64.4 mg
Lab
BTLabs
Vial
No label / Silver crimp / Red cap
Date
8/28/2026
Purity
99.7%
Quantity
50 mg → 50.4 mg
Lab
BTLabs
Vial
No label / Silver crimp / Clear cap
Date
8/6/2026
Purity
99.9%
Quantity
30 mg → 33 mg
Lab
BTLabs
Vial
No label / Silver crimp / Gray cap
| Product | Date | Score | Purity | Quantity | Lab | COA |
|---|---|---|---|---|---|---|
| BPC-157No label / Silver crimp / Clear Blue cap | 10/6/2026 | 10.0 | 99.6% | 20 mg → 22.8 mg | BTLabs | View |
| RetatrutideNo label / Silver crimp / Violet cap | 9/30/2026 | 10.0 | 99.9% | 30 mg → 29.99 mg | Harrens Lab | View |
| RetatrutideNo label / Silver crimp / Red cap | 9/16/2026 | 10.0 | 99.9% | 60 mg → 64.4 mg | BTLabs | View |
| GHK-CuNo label / Silver crimp / Clear cap | 8/28/2026 | 10.0 | 99.7% | 50 mg → 50.4 mg | BTLabs | View |
| TirzepatideNo label / Silver crimp / Gray cap | 8/6/2026 | 10.0 | 99.9% | 30 mg → 33 mg | BTLabs | View |
Which Qingdao Sigma Chemical QSC products tested best
Tirzepatide has the strongest record, graded A or B.
GHK-Cu, Retatrutide, BPC-157 and CJC-1295 graded D or E: a large share of their samples missed purity or quantity thresholds.
Buying from Qingdao Sigma Chemical QSC
If you order from Qingdao Sigma Chemical QSC, the A- and B-graded products are the safer picks on this record. For the weaker ones, the better-tested options on this page come from other shops.
We don't track Qingdao Sigma Chemical QSC's prices yet. Shipping, payment and refund terms are on their site.
The official store is chat.peppys.org/c/vendor-posts/8 https://qsc-usa.com. Check the address before you pay.
What to check before you pay
- The lot number on the vial matches the certificate
- The certificate names the lab and the test date
- Fill versus label, not purity alone
- A refund policy in writing
Track Qingdao Sigma Chemical QSC
Create a free account to save this vendor, get alerts for new lab tests, and watch price changes.
Qingdao Sigma Chemical QSC: common questions
Is Qingdao Sigma Chemical QSC legit?
We rate lab records, not businesses. Mixed lab record: 50 independent tests, 36 of 49 lots filled to label, median purity 99.8%, 4 of 5 products graded D or E. Each result links to its original certificate in the table above.
What do Qingdao Sigma Chemical QSC reviews say?
We don't hold scored customer reviews for Qingdao Sigma Chemical QSC yet. The independent lab results on this page are the evidence we have.
Which Qingdao Sigma Chemical QSC peptides tested best?
We have graded 5 Qingdao Sigma Chemical QSC products. Tirzepatide graded A or B. GHK-Cu, Retatrutide, BPC-157 and CJC-1295 graded D or E.
Is there a Qingdao Sigma Chemical QSC coupon code?
We don't have a verified Qingdao Sigma Chemical QSC coupon code. A discount changes the price, not what is in the vial.
Ordering from Qingdao Sigma Chemical QSC?
Mixed lab record: 50 independent tests, 36 of 49 lots filled to label, median purity 99.8%, 4 of 5 products graded D or E.
About Qingdao Sigma Chemical QSC
DO NOT purchase from qingdaosigmachemical.com: evidence of fraud, verify from a trusted source that you are purchasing from the legitimate vendor, and not from a fake site.