QSC Supply

QSC Supply provides wholesale research peptides and raw powders manufactured directly by Qingdao Sigma Chemical.

Best for Laboratories and research institutions

8.8
Peptide Ad Lab Score8.8 / 10
61% evidence coverage Visit Supplier

Company Overview

The site states that QSC Supply is the B2B and wholesale information resource for Qingdao Sigma Chemical (QSC), a direct manufacturer of research peptides and raw powders. The supplier's offerings are aimed at research institutions, laboratories, and procurement agents. The site publishes a catalogue of over 75 SKUs across six primary compound categories, alongside purity standards of ≥99% HPLC and ESI-MS identity confirmation.

According to the site, all production batches include an independent Janoshik Certificate of Analysis, and standard orders are placed via qsc-usa.com using Bitcoin or USDT with no minimum order quantity. Fulfillment is handled through domestic warehouses in eight global regions (USA, EU, UK, Canada, Australia, Singapore, Thailand, and Vietnam), with custom volume discussions available through direct contact. Buyers would still need to inquire about public wholesale pricing tiers, exact lead times for non-standard volumes, and terms for distribution agreements.

Pros
  • Direct manufacturer sourcing from Qingdao Sigma Chemical
  • Independent Janoshik Certificates of Analysis provided for every batch
  • Domestic fulfillment across eight global regions
  • No minimum order quantity for standard catalogue purchases
Considerations
  • Public pricing is unstated for volume and wholesale orders
  • Accepted payment methods are limited to cryptocurrencies (Bitcoin and USDT)
  • Specific lead times for custom or non-standard volume orders are unstated

Score Breakdown

Overall score is calculated from these seven dimensions using the house weighting, and each dimension is calculated from the verified criteria beneath it. Open a dimension to see every criterion, its verified state, the source it was verified from and the date it was checked. Comparison pages may re-weight the dimensions for buyer intent.

Testing & Documentation 25%
10.0
  • ✓Independent third-party testingSource: qsc-supply.com/ · checked 2026-09-08Verified
  • ✓Batch-specific certificates of analysisSource: qsc-supply.com/ · checked 2026-09-08Verified
  • ✓COAs publicly accessibleSource: qsc-supply.com/ · checked 2026-09-08Verified
  • ✓HPLC purity results publishedSource: qsc-supply.com/ · checked 2026-09-08Verified
  • ✓Mass spectrometry / identity verificationSource: qsc-supply.com/about.html · checked 2026-09-08Verified
  • ✓Testing laboratory named or identifiableSource: qsc-supply.com/ · checked 2026-09-08Verified
  • ✓Lot / batch traceabilitySource: qsc-supply.com/ · checked 2026-09-08Verified
  • ✓Documentation package available to wholesale buyersSource: qsc-supply.com/ · checked 2026-09-08Verified

18 of 18 verified points met → 10.0/10. Items shown as not confirmed are excluded from both sides of that calculation.

Business Transparency 20%
Not assessed
  • ✓Registered business entity namedSource: qsc-supply.com/about.html · checked 2026-09-08Verified
  • ?Verifiable physical addressNot confirmed
  • ?Named team, ownership or leadershipNot confirmed
  • ?Direct contact email or phone, not a form onlyNot confirmed
  • ?Published terms, shipping and returns policiesNot confirmed
  • ✓Operating or shipping jurisdictions disclosedSource: qsc-supply.com/ · checked 2026-09-23Verified
  • ?Business registration independently verifiableNot confirmed
  • ✓Manufacturing or sourcing origin statedSource: qsc-supply.com/about.html · checked 2026-09-08Verified

Too little of this dimension could be verified to publish a score, so it is excluded from the overall and the other weights are rebalanced.

Wholesale Capabilities 15%
10.0
  • ✓Published wholesale or B2B programSource: qsc-supply.com/ · checked 2026-09-08Verified
  • ✓Tiered or volume pricingSource: qsc-supply.com/ · checked 2026-09-08Verified
  • ✓Minimum order quantity statedSource: qsc-supply.com/ · checked 2026-09-08Verified
  • ✓Bulk quantities (gram scale and above)Source: qsc-supply.com/bulk-peptides.html · checked 2026-09-08Verified
  • ✓Distributor or reseller supportSource: qsc-supply.com/ · checked 2026-09-08Verified
  • ?Private-label programNot confirmed
  • ✓Custom orders acceptedSource: qsc-supply.com/ · checked 2026-09-08Verified
  • ✓Dedicated wholesale enquiry / RFQ processSource: qsc-supply.com/ · checked 2026-09-08Verified

16 of 16 verified points met → 10.0/10. Items shown as not confirmed are excluded from both sides of that calculation.

Manufacturing Capabilities 15%
10.0
  • ✓In-house synthesis rather than resale onlySource: qsc-supply.com/about.html · checked 2026-09-08Verified
  • ✓Manufacturing facility or partner disclosedSource: qsc-supply.com/about.html · checked 2026-09-08Verified
  • ?Stated quality system (cGMP, ISO or equivalent)Not confirmed
  • ?Custom sequence synthesis offeredNot confirmed
  • ?Selectable purity gradesNot confirmed
  • ?Stated production scale rangeNot confirmed
  • ✓Lyophilisation / fill-finish capabilitySource: qsc-supply.com/ · checked 2026-09-08Verified
  • ✓Stability or storage data publishedSource: qsc-supply.com/bulk-peptides.html · checked 2026-09-08Verified

10 of 10 verified points met → 10.0/10. Items shown as not confirmed are excluded from both sides of that calculation.

Commercial Purchasing 10%
Not assessed
  • ?Business account application or approvalNot confirmed
  • ?Quotes and purchase orders supportedNot confirmed
  • ?Account-level or contract pricingNot confirmed
  • –Multiple business payment methodsSource: qsc-supply.com/ordering.html · checked 2026-09-23Not offered
  • ?Formal invoicing and documentationNot confirmed
  • ?Named contact or account managerNot confirmed
  • ?Repeat-order or standing-order supportNot confirmed
  • ?Payment terms available to approved accountsNot confirmed

Too little of this dimension could be verified to publish a score, so it is excluded from the overall and the other weights are rebalanced.

Fulfillment & Logistics 10%
Not assessed
  • ✓Domestic shipping with stated timeframesSource: qsc-supply.com/ · checked 2026-09-08Verified
  • ✓International shippingSource: qsc-supply.com/ · checked 2026-09-08Verified
  • ?Cold-chain or temperature-controlled shippingNot confirmed
  • ?Lead times publishedNot confirmed
  • ?Order tracking providedNot confirmed
  • ✓Stock or availability visible before orderingSource: qsc-supply.com/ · checked 2026-09-08Verified
  • ✓Stated packaging and handling standardsSource: qsc-supply.com/bulk-peptides.html · checked 2026-09-08Verified
  • ?Documented returns or discrepancy processNot confirmed

Too little of this dimension could be verified to publish a score, so it is excluded from the overall and the other weights are rebalanced.

Website / Buyer Experience 5%
Not assessed
  • ✓Secure, working site with no broken commerce pathsSource: qsc-supply.com/ · checked 2026-09-23Verified
  • ?Usable on mobileNot confirmed
  • ✓Product pages with specification detailSource: qsc-supply.com/bulk-peptides.html · checked 2026-09-23Verified
  • ?Search and filtering across the catalogueNot confirmed
  • ?COAs reachable in a few clicksNot confirmed
  • ?Pricing visible or obtainable without frictionNot confirmed
  • ✓Clear path to the wholesale or B2B routeSource: qsc-supply.com/ · checked 2026-09-08Verified
  • ?Visible support channelsNot confirmed

Too little of this dimension could be verified to publish a score, so it is excluded from the overall and the other weights are rebalanced.

Rubric score 10.0 across the 61% of the rubric verified so far, adjusted for evidence coverage to a published score of 8.8. How this is calculated

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