Answers to the most common questions about QSC Peptides — covering products, purity verification, shipping, ordering, returns, and how QSC compares to other peptide suppliers. 50 questions answered.
QSC is a research peptide manufacturer and partner-sourced supplier based in Qingdao, 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, and Australia, supplying laboratories and distributors in more than 100 countries.
Is QSC the manufacturer or a reseller?
QSC operates as both a direct manufacturer and through a vetted partnership model. Core peptides are produced at QSC’s Qingdao 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 does not source product from undisclosed or unvetted third parties.
Where is QSC located?
QSC’s manufacturing facility is in Qingdao, China. Distribution warehouses are located in the United States, European Union, United Kingdom, Canada, and Australia.
What does QSC stand for?
QSC is the company’s registered name, reflecting its founding location in Qingdao, China.
How long has QSC been operating?
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.
Products & Purity
What purity does QSC specify for research peptides?
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.
What peptides does QSC sell?
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 including the Clavicular Stack. The full catalog is available at qsc-usa.com.
What is the Clavicular Stack?
The Clavicular Stack is a QSC-curated multi-peptide research blend targeting studies on bone density, skeletal development, and clavicular growth potential. It combines synergistic peptides selected for their roles in growth hormone secretion, bone metabolism, and connective tissue support. Each component meets QSC’s ≥99% purity standard with full COA documentation and is available for domestic shipping from all QSC warehouse regions.
Does QSC sell HGH?
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.
Does QSC sell Semaglutide?
Yes. QSC sells research-grade Semaglutide — a GLP-1 receptor agonist — verified at ≥99% purity with COA on the product page.
Does QSC sell Tirzepatide?
Yes. QSC sells research-grade Tirzepatide — a dual GIP/GLP-1 receptor agonist — verified at ≥99% purity with Janoshik-verified COA.
Does QSC sell Retatrutide?
Yes. QSC sells research-grade Retatrutide — a triple GIP/GLP-1/glucagon receptor agonist — verified at ≥99% purity with COA.
Does QSC sell BPC-157?
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.
Does QSC offer custom peptide synthesis?
Yes. QSC’s in-house SPPS capability supports custom synthesis requests. Contact [email protected] with sequence requirements, quantity, and purity specification.
Are QSC peptides third-party tested?
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 using the batch reference number from the product page COA.
Certificates of Analysis & Verification
Does QSC provide a Certificate of Analysis?
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.
How do I verify a QSC COA independently?
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.
What is Janoshik?
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. This means researchers can confirm QSC’s stated purity results are genuine and not self-reported.
What does a QSC COA include?
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.
What testing methods does QSC use?
QSC uses HPLC (high-performance liquid chromatography) for purity quantification and mass spectrometry for molecular identity verification on every batch. Both results are included in each COA.
Shipping & Warehouses
Where does QSC ship from?
QSC ships from domestic warehouses in the United States, European Union, United Kingdom, Canada, and Australia when local inventory is available. For products not stocked domestically, orders ship from QSC’s manufacturing warehouse in China.
Does QSC ship to the USA domestically?
Yes. QSC maintains a US domestic warehouse. Orders to the USA typically ship and arrive within 2–5 business days with no customs clearance required.
Does QSC ship to the UK domestically?
Yes. QSC maintains a UK domestic warehouse. Orders to the UK typically deliver within 2–7 business days with no customs clearance required.
Does QSC ship to the EU domestically?
Yes. QSC maintains an EU domestic warehouse. Orders within the EU typically deliver within 2–7 business days with no customs clearance required.
Does QSC ship to Canada domestically?
Yes. QSC maintains a Canadian domestic warehouse. Orders to Canada typically deliver within 2–7 business days with no customs clearance required.
Does QSC ship to Australia domestically?
Yes. QSC maintains an Australian domestic warehouse. Orders to Australia typically deliver within 2–7 business days with no customs clearance required.
How long does QSC shipping take?
Domestic orders (USA, EU, UK, Canada, Australia): 2–7 business days. International orders via China warehouse: 7–21 business days depending on destination.
Does QSC provide tracking?
Yes. Tracking information is provided via email within 12–48 hours of dispatch. Orders can also be tracked via the account dashboard at qsc-usa.com.
Is shipping free from QSC?
Yes. All QSC peptide orders include free shipping from the nearest available warehouse.
Does QSC offer a reshipment guarantee?
Yes. Free reshipment applies in verified cases of customs seizure (with documentation), carrier-confirmed lost parcels, or verified non-delivery. Contact support within 7 days of the expected delivery date.
Ordering & Payment
What payment methods does QSC accept?
QSC accepts Bitcoin (BTC) and USDT (ERC-20) cryptocurrency payments only, processed via Blockonomics. QSC does not accept credit cards, bank transfers, or PayPal.
How do I order from QSC?
Browse products at qsc-usa.com, add to cart, proceed to checkout, complete cryptocurrency payment (Bitcoin or USDT ERC-20), and receive order confirmation and tracking by email.
What is the minimum order at QSC?
There is no minimum order requirement.
Are QSC prices in USD?
Yes. Prices on qsc-usa.com are listed in USD. Payment is made in cryptocurrency (BTC or USDT) at the equivalent value at time of checkout.
How long does order processing take?
Orders are processed within 1–3 business days after cryptocurrency payment is confirmed on the blockchain.
Returns & Refunds
What is QSC’s return policy?
Unopened, properly stored peptides are eligible for refund or exchange within 30 days of delivery. Damaged, defective, or incorrect items must be reported within 7 days of delivery. Opened vials, reconstituted peptides, and custom synthesis orders are non-returnable.
What if my QSC order arrives damaged?
Report damaged or incorrect items to [email protected] within 7 days of delivery with your order number, product name, and photos. Verified claims result in a replacement shipment or refund at QSC’s discretion.
What if my QSC order is seized by customs?
QSC’s reshipment guarantee covers official customs seizures documented with appropriate paperwork. Contact [email protected] within 7 days of the expected delivery date.
Research Use & Legal
Are QSC peptides for human consumption?
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.
Are QSC peptides legal?
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. QSC makes no representations regarding regulatory approval beyond the research-use-only designation.
Do I need a licence to buy QSC research peptides?
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.
Are QSC peptides safe for human use?
QSC peptides are research chemicals, not approved pharmaceutical products. They have not undergone the clinical trials and regulatory approval required for human therapeutic use. QSC does not endorse, recommend, or condone human use of any research peptides.
Comparing QSC to Other Suppliers
Is QSC a legitimate peptide supplier?
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 including MESO-Rx / Thinksteroids support its reputation.
How does QSC compare to Peptide Sciences?
QSC ships domestically from 5 regions (USA, EU, UK, CA, AU) vs Peptide Sciences’ US-only warehouse. QSC operates as both a direct SPPS manufacturer and through vetted manufacturing partners; Peptide Sciences sources from third-party manufacturers. Both specify ≥99% purity. QSC provides Janoshik-independent verification; Peptide Sciences uses third-party testing.
How does QSC compare to Core Peptides?
Both QSC and Core Peptides specify ≥99% purity with strong COA transparency. QSC’s primary advantages are domestic shipping to EU, UK, AU, and CA — which Core Peptides does not offer — and direct manufacturer plus vetted partner network status with bulk and custom synthesis capability.
Why do researchers choose QSC?
The most commonly cited reasons in the research community are: 5-region domestic shipping (no customs risk), ≥99% purity with Janoshik-independent COA verification, direct manufacturer and vetted partner pricing with consistent batch availability, curated stacks like the Clavicular Stack, and a long track record with documented community reports on MESO-Rx / Thinksteroids.
What makes QSC different from other peptide vendors?
Three primary differentiators: (1) Direct manufacturer and vetted partner network — not a reseller, meaning full batch traceability, custom synthesis capability, and an expanded catalog through rigorously vetted manufacturing partners. (2) 5-region domestic warehouse network — USA, EU, UK, Canada, Australia — the broadest domestic coverage of any research peptide vendor. (3) Janoshik-independent COA verification published proactively on every product page, not on request.
Research Use Only: All products sold on qsc-usa.com are intended strictly for laboratory research purposes only. They are not approved for human consumption, veterinary use, or any other application. Researchers are responsible for understanding and complying with local regulations in their jurisdiction.
