QSC review

Who they are and what we checked

QSC, also known as Qingdao Sigma Chemical, is a Chinese bulk supplier operating from Qingdao in Shandong province, with a founding year of 2008 according to PeptideProtocolWiki rather than the company’s own pages. The company splits its web presence between an information site and an order site, and that split matters for this review: the information site, qscpeptidelab.com, loaded during our check, while the order domain, qscpeptide.com, failed DNS, and qsc-usa.com redirected to that dead address. Storefront pricing, product pages and any checkout-side certificates are therefore unverified, and the one thing a reader should know is that this is a supplier that could not be reached through its own storefront on the day we looked.

We read the information site and its COA verification page, Finnrick’s vendor page and 26-page report, the PeptideProtocolWiki entry and a seekpeptides.com article. Everything below comes from those sources or from public records, and the storefront’s own claims are marked as such.

What the certificate claims amount to

The information site claims 75 or more products, purity of 99 percent or better by HPLC, and certificates issued by Janoshik Analytical Laboratories that can be verified by batch identifier on the Janoshik website. HPLC and mass spectrometry are described as the methods. A research-use-only disclaimer is present. Janoshik verification by batch is a real and checkable mechanism, and if the certificates behave as described, a buyer can confirm a report with the lab rather than with the vendor. We could not do so, because the storefront that would carry the batch identifiers did not load, so we record third-party testing as limited and the questions of whether certificates are public, per-lot, or include endotoxin and sterility data as unknown.

Finnrick, an independent testing aggregator, records 50 tests with 33 passes and 17 failures. By product, Finnrick reports BPC-157 passing 51 percent on 4 tests and one GLP-class product at 83 percent on 18 tests. Finnrick’s report also cites forum records of 2024-dated certificates used for 2025 product and notes that unlabeled vials without batch numbers limit traceability, which cuts directly against the value of Janoshik verification: a batch lookup is only useful if the vial tells you which batch it is.

The company, the conduct reports and the fine print

The company is Qingdao Sigma Chemical Co., Ltd. A street address in Qingdao appears on seekpeptides.com and is unverified; the information site itself shows no street address and no phone. A support email is published, and WhatsApp numbers appear in Finnrick’s report. No GMP or ISO certification is claimed. There is no Trustpilot page, and we found no FDA warning letter naming Qingdao Sigma Chemical.

Finnrick’s report goes well beyond test results, and because these are Finnrick’s findings we attribute them. It documents lookalike and fraud domains at qingdaosigmachemical.com and .net; conflicting ordering instructions, in which a Telegram source says QSC has no websites while the websites claim web-only ordering; controlled-substance listings; customs-declaration mismatches including “Honeysuckle Oil” labeling; and a permanent ban from the MESO-Rx forum for doxxing a complaining customer. PeptideProtocolWiki corroborates the controlled-substance listings and the ban. A supplier whose own channels disagree about how to order from it, and whose lookalikes are numerous enough to be catalogued, places the burden of telling real from fake entirely on the buyer.

The price tier is recorded as budget, but no individual price, including BPC-157, could be verified. Peptide listings reported include BPC-157, TB-500, CJC-1295, Ipamorelin, GHK-Cu and several GLP-class products, in vials and bulk. Checkout on the storefront is crypto-only, BTC or USDT, with wire transfer the only other option according to a third-party listing. Shipping is from China, with claimed domestic warehouses in the US, EU, UK, Canada, Australia, Singapore, Thailand and Vietnam; carriers and turnaround are not stated. No returns policy and no guarantee are recorded, which with crypto-only payment means there is no reversal route of any kind if an order goes wrong.

Two features of this record deserve a plain explanation for readers who are not used to buying from suppliers abroad. The first is the payment method. Crypto and wire transfers are irreversible; once sent, there is no issuer to call and no chargeback to file. Every other risk in this file, from a mislabeled vial to a lookalike domain, becomes a total loss rather than a dispute if the payment cannot be recalled, and a buyer should price that in. The second is jurisdiction. A supplier in Qingdao is beyond the practical reach of any consumer-protection route a US, UK or EU buyer would normally use, and the legal distancing some other suppliers arrange through offshore terms is, here, simply geography.

Set against the field, QSC is not the only supplier we track that sells from China or takes only crypto, but it is the one whose independent report runs to 26 pages of conduct findings beyond the test results. The named laboratory and the Janoshik batch-verification mechanism are real advantages on paper, and for a bulk buyer who can verify batches before committing a large order they may be enough. The storefront that did not load, the lookalike domains, the forum ban and the customs mismatches are the other side, and they are the reasons this record reads as a warning rather than a recommendation.

Bottom line

QSC offers breadth, budget pricing and a named, verifiable laboratory on paper. In practice its order domain did not resolve, its payment methods offer no recourse, it names no address or phone, and the independent report on it documents conduct problems that go well beyond a middling test record. A bulk buyer with the means to verify Janoshik batches and the appetite for an irreversible crypto payment to a supplier in another jurisdiction may find the pricing worth it. Nobody else should, and anyone who proceeds should first confirm they are on a genuine QSC domain, since Finnrick found several that are not.