TitrateLab/Vendors/QSC
▸ Vendor trust profile
QSC
Lab-verified evidenceQingdao Sigma Chemical
An independent, evidence-first review of QSC (Qingdao Sigma Chemical) — wondering if QSC is legit? Every number below is sourced from 337 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 258 assayed batches
Purity distribution
258 batches · ProCOAs tracked
337
third-party certs
Pass rate
100%
batches ≥90% purity
Compounds
88
distinct peptides
Coverage
2022-12 → 2026-06
first → latest test
The batch-by-batch distribution is a Pro feature
See every one of QSC's 258 assayed batches plotted by purity around the 99.0% average — the real per-batch readings behind the headline stats.
Go Pro — $9/mo or $33 lifetimeCompounds tested
88 distinctPeptides with at least one tracked certificate from this vendor. Tap a linked compound for the full research hub.
Recent certificates
337 total · showing 2A sample of the most recently tested batches. Each links to its full, public certificate page — purity, method, lab, and test date.
The full certificate list is a Pro feature
Open every one of the 337 third-party certificates TitrateLab tracks for QSC — purity, method, lab, and test date on each.
Go Pro — $9/mo or $33 lifetimePer-compound purity
mean purity by peptide · ProAverage assayed purity for each of 88 compounds — the batch-level breakdown behind the headline average. Tap the tile to unlock with Pro.
Per-compound purity is a Pro feature
See QSC's average assayed purity for each of its 88 compounds — the batch-level breakdown behind the headline 99.0% average.
Go Pro — $9/mo or $33 lifetimeCommunity reviews
Pro-member sourcedUnlock QSC's full lab evidence
The trust teaser above is free & always will be. Unlock all 337 certificates, the batch-by-batch purity distribution, the per-compound breakdown, plus live pricing, stock & the full Pro review thread.
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Frequently asked
purity & lab evidenceIs QSC legit?
TitrateLab tracks 337 third-party lab certificates of analysis for QSC, averaging 99.0% tested purity across 258 assayed batches, with 100% of those batches at or above the 90% purity line (tests dated 2022-12-10 to 2026-06-08). 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.
What is QSC's average tested purity?
Across the 258 assayed batches TitrateLab tracks for QSC, the mean third-party-tested purity is 99.0%. Purity is measured on the specific batches that were submitted for analysis and is not a guarantee for any other lot.
How many lab certificates does TitrateLab track for QSC?
TitrateLab tracks 337 published third-party certificates of analysis for QSC spanning 88 distinct compounds. Each certificate links to its own public page with the purity, test method, issuing lab, and test date.
What share of QSC's tested batches meet a 90% purity threshold?
100% of the 258 assayed batches TitrateLab tracks for QSC (258 of 258) tested at or above 90% purity. This reflects only the batches that were tested and is purity-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. A high pass rate reflects the batches that were tested; it is not a guarantee of every order. Browse the COA corpus →