TitrateLab/Vendors/QSC
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Qingdao Sigma Chemical
An independent, evidence-first review of QSC (Qingdao Sigma Chemical) — wondering if QSC is legit? Every number below is sourced from 515 third-party lab certificates of analysis, not vendor marketing. The headline trust stats are free; the batch-by-batch evidence, every certificate, pricing & stock are TitrateLab Pro.
Average purity
mean across 404 assayed batches
⚠ 12 batches underdosed — worst -15% vs labeled dose
Purity distribution
404 batches · ProCOAs tracked
515
third-party certs
In-spec rate
97%
12 underdosed · worst -15%
Compounds
107
distinct peptides
Coverage
2022-12 → 2026-07
first → latest test
See every one of QSC's 404 assayed batches plotted by purity around the 98.9% average — the real per-batch readings behind the headline stats.
Go Pro — $12/mo or $33 lifetimePurity tells you how clean the peptide is. Dose tells you how much you actually got — tested milligrams vs the labeled amount. A vial can be 99% pure and still badly underfilled, which never shows on the purity chart. On-target means within ±10% of label; anything outside (under or over) is off-target.
On-target
55%
within ±10% of label
Median
+10%
vs labeled dose
Worst underfill
-15%
12 batches <−10%
Worst overfill
+100%
90 batches >+10%
See every one of QSC's 226 dose-tested batches plotted by deviation from labeled dose — the real per-batch underfill/overfill behind the headline stats.
Go Pro — $12/mo or $33 lifetimeGrouped by class, most-tested first. Tap a linked compound for the full research hub.
No compound matches .
Every third-party certificate of analysis TitrateLab tracks for QSC, grouped by compound. Tap a thumbnail for the full certificate image; each links through to its public cert page — purity, method, lab, and test date.
Every compound QSC has certificates for. Switch the measure — each one reports how many certificates it is actually based on, and compounds never tested for that measure drop out rather than showing as zero.
109 compounds, 82 certificates on the busiest
Relayed from the vendor’s own Discord · not independently verified
After losing a shipment to customs, getting peps that are absolutely useless and throwing away a whole shipment because of it, QSC knock it out of the park. A…
Relayed from the vendor’s own Discord · not independently verified
Ordered july 17th Arrived 30th july No issues arriving to australia!
Relayed from the vendor’s own Discord · not independently verified
Aus warehouse is so OP, getting chinese prices and receiving packs within 3 days is NUTS. Aus is the hardest to land any raw materials. 4/4 local
The trust teaser above and the full certificate list are free & always will be. Unlock every batch's purity inline across all 515 certificates, the batch-by-batch purity distribution, the per-compound breakdown, plus live pricing, stock & the full Pro review thread.
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TitrateLab tracks 515 third-party lab certificates of analysis for QSC, averaging 98.9% tested purity across 404 assayed batches, with 97% of those batches in spec on both purity (≥90%) and labeled dose (filled to within 10% of the labeled amount); 12 assayed batches were significantly underdosed (worst -15% vs the labeled amount) (tests dated 2022-12-02 to 2026-07-27). These are purity analytics from independent certificates, not vendor marketing — TitrateLab does not rank or endorse vendors, and this is research-use-only information, not a recommendation to purchase or use any product.
Across the 404 assayed batches TitrateLab tracks for QSC, the mean third-party-tested purity is 98.9%. Purity is measured on the specific batches that were submitted for analysis and is not a guarantee for any other lot.
TitrateLab tracks 515 published third-party certificates of analysis for QSC spanning 107 distinct compounds. Each certificate links to its own public page with the purity, test method, issuing lab, and test date.
97% of the 404 assayed batches TitrateLab tracks for QSC (392 of 404) were in spec on BOTH tested purity (at or above 90%) and labeled dose (filled to within 10% of the labeled amount). 12 assayed batches were significantly underdosed against the label (worst -15%), so they are counted as out of spec even where tested purity was high. This reflects only the batches that were tested and is analytic information for research use, not a quality guarantee for any order.
Answers are derived from the third-party lab certificates TitrateLab tracks for this vendor and describe tested purity only. This is research-use-only information, not medical advice and not a recommendation to purchase or use any product.
How this is sourced. TitrateLab tracks certificates of analysis posted by the community and verified against the issuing lab. Purity, test dates, and compound names shown here are the same facts published on each public certificate page — aggregated, never edited. The in-spec rate counts a batch only when it clears both purity (≥90%) and labeled dose (filled to within 10% of label, where dose data exists); it reflects the batches that were tested and is not a guarantee of every order. Scores come only from lab data — no vendor pays for placement, and customer orders or Pro never move a grade. Browse the COA corpus →
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QSC has 515 lab results on file - the worst batch tested 15.0% under its label. Pro unlocks every certificate and the full history.
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