Frequently Asked Questions

QSC is a research peptide manufacturer and partner-sourced supplier based in China. Core peptides are produced in-house using solid-phase peptide synthesis (SPPS), and QSC also partners with rigorously vetted manufacturers to expand its catalog. All products — whether in-house or partner-sourced — undergo the same QSC quality control process. QSC distributes globally from domestic warehouses in the USA, EU, UK, Canada, Australia, Singapore, Thailand, and Vietnam, supplying laboratories and distributors in more than 100 countries.

QSC operates as both a direct manufacturer and through a vetted partnership model. Core peptides are produced at QSC's China facility — synthesised, purified by preparative HPLC, verified by mass spectrometry, lyophilized, and distributed. QSC also partners with rigorously vetted manufacturers to expand its product range. All partner-sourced products undergo the same QSC quality control and analytical verification before distribution.

QSC's manufacturing facility is in China. Domestic distribution warehouses are located in the United States, European Union, United Kingdom, Canada, Australia, Singapore, Thailand, and Vietnam.

QSC is the company's registered name, reflecting its founding location in China.

QSC has been active in the research peptide market for several years and is one of the most recognised peptide suppliers in the global research community, supplying laboratories and distributors in over 100 countries.

No. QSC (qscpeptidew.com) has no affiliation with qingdaosigmachemical.com, qingdaosigmachemical.net, or qingdaosigma.com. Those websites are fraudulent. The only official QSC storefront is qscpeptidew.com.

QSC specifies ≥99% purity for all research peptides — whether manufactured in-house or partner-sourced — verified by HPLC (high-performance liquid chromatography) peak area analysis. This is a per-batch minimum guarantee, not an average.

QSC's catalog includes GLP-1 and metabolic peptides (Semaglutide, Tirzepatide, Retatrutide, AOD-9604, HGH Fragment 176-191), growth hormone axis peptides (HGH, Sermorelin, CJC-1295 No DAC, Ipamorelin, GHRP-2, GHRP-6, IGF-1 LR3), recovery peptides (BPC-157, TB-500, BPC-157+TB-500 Blend), longevity peptides (Epitalon, NAD+, Thymosin Alpha-1), cosmetic peptides (Melanotan II, GHK-Cu), nootropic peptides (Semax, Selank), and curated stacks.

Yes. QSC sells research-grade recombinant human growth hormone (HGH/somatropin) in multiple IU sizes including 10 IU, 15 IU, 24 IU, and 36 IU vials, plus 100 IU kits.

Yes. QSC sells research-grade Semaglutide — a GLP-1 receptor agonist — verified at ≥99% purity with COA on the product page.

Yes. QSC sells research-grade Tirzepatide — a dual GIP/GLP-1 receptor agonist — verified at ≥99% purity with Janoshik-verified COA.

Yes. QSC sells research-grade BPC-157 as standalone vials, TB-500 as standalone, and a pre-blended BPC-157 + TB-500 Blend vial. All verified at ≥99% purity.

Yes. QSC's in-house SPPS capability supports custom synthesis requests. Contact https://www.my-a1.xyz/chat?tenant=w2bz8ixju0&locale=auto with sequence requirements, quantity, and purity specification.

Yes. A Certificate of Analysis (COA) is published on every QSC product page for every batch. Each COA includes HPLC purity data with chromatogram, mass spectrometry molecular weight confirmation, batch number, and Janoshik verification reference.

Go to verify.janoshik.com and enter the batch reference number from the COA linked on the QSC product page. The Janoshik record confirms the compound tested, the purity result, and the date — independently of QSC.

Janoshik is an independent analytical testing laboratory that verifies peptide testing results. QSC submits batch samples to Janoshik for independent confirmation, and the results are published in publicly searchable records.

Each COA includes: the compound name and batch number, the HPLC purity result (≥99%) with chromatogram, the mass spectrum confirming correct molecular weight, water content data, appearance description, and the Janoshik verification reference number.

Yes. Every QSC batch — whether manufactured in-house or partner-sourced — is independently verified through Janoshik, an independent analytical laboratory. The verification record is publicly searchable at verify.janoshik.com.

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Domestic warehouse (USA, EU, UK, CA, AU, SG, TH, VN): 3-7 business days. China warehouse: 7-14 business days. All shipping is free regardless of which warehouse fulfills your order.

QSC ships from domestic warehouses in the United States, European Union, United Kingdom, Canada, Australia, Singapore, Thailand, and Vietnam when local inventory is available — no customs clearance required. For products not stocked regionally, orders ship from China.

After order completion, the order number is expected to be shipped within 1-4 business days. You can track the logistics on our website's logistics tracking page.

QSC supports Bitcoin (BTC), Ethereum (ETH), USDT, USDC and bank wire transfer for account recharge.

Yes. All QSC orders include free shipping regardless of which warehouse fulfills the order. If your order splits across multiple warehouses, all shipments are covered.

No. There is no minimum order requirement.

No. Orders cannot be modified or cancelled once submitted and payment is confirmed. Please review your order carefully before completing payment.

No. All sales are final. QSC does not offer refunds under any circumstances. In verified cases of customs seizure, carrier-confirmed lost parcel, or non-delivery, QSC provides one free reshipment or store credit for a future order — at the customer's choice.

QSC provides one free reshipment or store credit for a future order for orders seized by customs. The guarantee is limited to one occurrence per order. Submit documented proof to https://www.my-a1.xyz/chat?tenant=w2bz8ixju0&locale=auto within 7 days of the expected delivery date.

Report damaged or incorrect items to https://www.my-a1.xyz/chat?tenant=w2bz8ixju0&locale=auto within 7 days of delivery with your order number, product name, and photos. Verified claims are resolved via replacement shipment at QSC's discretion.

In the rare event that an ordered item becomes unavailable after payment is confirmed, QSC will issue store credit for use on a future order. Refunds are not available.

No. All products sold by QSC are intended strictly for laboratory research purposes only. They are not approved for human consumption, veterinary use, diagnostic, or therapeutic application.

The legal status of research peptides varies by jurisdiction. Researchers are solely responsible for determining the legality of importing, possessing, or using specific compounds in their location.

Requirements vary by country and compound. Researchers are responsible for understanding and complying with local regulations before ordering. QSC sells to verified researchers for laboratory use.

QSC peptides are research chemicals, not approved pharmaceutical products. They have not undergone clinical trials and regulatory approval required for human therapeutic use. QSC does not endorse human use of any research peptides.

QSC is one of the most recognised peptide suppliers in the global research community with documented supply to 100+ countries. Independent verification through the Janoshik portal, published COAs on every product page, and an extensive track record on research forums support its reputation.

QSC ships domestically from 8 regions (USA, EU, UK, CA, AU, SG, TH, VN) vs Peptide Sciences' US-only warehouse. QSC provides Janoshik-independent COA verification while Peptide Sciences uses third-party testing.

Both specify ≥99% purity with strong COA transparency. QSC's primary advantages are domestic shipping to EU, UK, AU, CA, SG, TH, and VN and direct manufacturer plus partner network status with bulk and custom synthesis capability.

Common reasons include: 8-region domestic shipping (no customs risk), ≥99% purity with Janoshik-independent COA verification, direct manufacturer pricing with consistent batch availability, curated stacks (Clavicular Ascension Stack, Venus Protocol, Midas Longevity Protocol), and a long community track record.