QSC

Qingdao Sigma Chemical

Is QSC legit?

TitrateLab has 733 lab test records for QSC, tested from to , covering 143 product names. Median measured purity is 99.5% across 538 purity tests; 6 were below 90%. 1 test did not detect the expected compound. In the last 6 months, 37 fill tests compared the measured amount with the label: 0 were more than 15% under and 8 were more than 15% over. None of the 19 classified endotoxin tests failed. Buyers have left 233 approved reviews: read the QSC reviews. Lab results describe the batches that were tested, not every product or order.

The HGH catalog investigation examined its overseas listings, without confirming supply arrangements. The retatrutide comparison placed it outside the top five based on eligible report count, not reliability.

733Test records143 recorded name groups

Reports by test date

2022-06-242026-10-06

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99.5%Median purity538 positive purity tests
233Community reviewsRead QSC reviews →
0

Endotoxin failures

19 classified tests · All time

1

Expected compound not detected

539 reported purity outcomes · All time

0

Underfilled >15%

37 fill tests · Last 6 months

8

Overfilled >15%

37 fill tests · Last 6 months

0

Reported zero amount

407 numeric amount results · All time

None recorded

Lab reports

733 test records on file · June 2022 to October 2026

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Test results

How the fills compare

252 fill tests · All time

Measured against the printed amount. Finnrick quantities are excluded.

Beyond the purity average

538 positive tests

Mean 98.6% · Median 99.5%. The 90% grouping is not a safety threshold.

Test coverage & missing results

194 records have no usable purity outcome. 481 do not have a comparable fill test. 714 lack a classified endotoxin result. A classified pass does not mean no endotoxin was detected.

Reports behind these results

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QSC reviews

The 10 most recent approved reviews. Buyer experiences—not lab results or verified purchases.

222Positive
9Neutral
2Negative
0Unclassified
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Public review excerpts

Prices & value

Market price index →

Recorded offers—not a live stock guarantee. Package quantity, delivery market and price basis stay attached.

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Research involving QSC

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Published investigations, with the sources and context behind the findings.

Questions about QSC

Answers based on the published evidence—not a vendor endorsement.

Is QSC legit?

TitrateLab has 733 lab test records for QSC, tested from June 24, 2022 to October 6, 2026, covering 143 product names. Median measured purity is 99.5% across 538 purity tests; 6 were below 90%. 1 test did not detect the expected compound. In the last 6 months, 37 fill tests compared the measured amount with the label: 0 were more than 15% under and 8 were more than 15% over. None of the 19 classified endotoxin tests failed. Buyers have left 233 approved reviews: read the QSC reviews. Lab results describe the batches that were tested, not every product or order.

How to check if a peptide vendor is legit: six checks, and what they cannot prove.

What is QSC's average purity?

98.6% mean measured purity across 538 positive purity tests; 6 below 90%. The 90% grouping is not a safety threshold. 1 additional test did not detect the expected compound.

How many QSC lab test records has TitrateLab tracked?

TitrateLab has 733 lab test records for QSC. Tested from 2022-06-24 to 2026-10-06. A test record is not necessarily a unique certificate. 2 repeated records excluded by the certificate index.

How do QSC's measured fills compare with the label?

Last 6 months: 29 of 37 fill tests within ±15% of label, 0 more than 15% under and 8 more than 15% over. All time: 194 of 252 fill tests within ±15% of label, 5 more than 15% under and 53 more than 15% over. The measured amount is compared with the printed label. Finnrick quantity comparisons are excluded because they use a vendor batch claim. Missing tests are not passes.

Has QSC failed an endotoxin test?

Of 19 classified endotoxin tests, 0 failed, 0 were borderline and 19 passed. A pass does not mean no endotoxin was detected.

Sources, definitions & limits

Names on reports; vendor role unverified. A test record is not necessarily a unique certificate.

The reports describe the batches that were tested, not an untested vial or an offer from this vendor.

735 published records are attributed to this vendor. The current certificate index excludes 2 repeated records using file hashes and supported lab verification links. Missing identity keys can leave repeated certificates. Recorded name groups can include variants, mixtures and unclassified names.

Evidence dates describe the tested samples, not when the vendor was founded, current stock, or a performance trend. Purity uses positive measurements only. Exact-zero purity is a not-detected identity outcome, not proof of an empty vial. A zero measured amount requires an explicit numeric amount result; missing amounts are not zero.

Underfills and overfills here exceed 15% in either direction against the printed amount. Vendor batch claims are not used; Finnrick quantity comparisons are excluded. Recent outcomes cover 2026-05-01 through 2026-11-01, inclusive. The summary, charts and FAQ use these same definitions. Missing tests are not passing results.

Endotoxin failures, borderline outcomes and passes use the recorded lab verdict. A pass is not proof of no endotoxin. Only 19 records have a classifiable result. Community sentiment describes reviews, not laboratory measurements or independently verified purchases. Results are not certification, medical advice or endorsement.

Independent evidence · Not certification or endorsement · Browse vendors

Contact advisory · QSC

Phishing warning: qsc-supply.com is not affiliated with Qingdao Sigma Chemical (QSC). QSC states that it accepts orders only through Telegram. Do not place orders, create an account, or send payment through that domain. Independently verify any payment destination before sending funds.

Read this warning before relying on ordering or payment details. Contact research cannot guarantee a vendor's identity.

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