Answers to the most common questions about QSC Peptides — covering products, purity verification, COA, shipping from 8 domestic warehouse regions, ordering, returns, and how QSC compares to other peptide suppliers. 44 questions answered.
⚠️ Warning: Active Impersonation Scam
We are not associated with qingdaosigmachemical.com / qingdaosigmachemical.net / qingdaosigma.com. They are running a fraudulent scheme impersonating well-known vendors. Their other websites all look the same, only with different vendor name and domain name, including wuhanwanshengbio.com / wuhanwanshengbiotechnology.com, sigmaaudley.shop, and ggpeps.net.
If you have sent payment to their website, it might be lost, and QSC is unable to intervene.
🛡️ QSC’s only official storefront is qsc-usa.com. Always verify you are on the correct site before making any payment.
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.
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 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 does not source product from undisclosed or unvetted third parties.
Where is QSC located?
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.
What does QSC stand for?
QSC is the company’s registered name, reflecting its founding location in 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.
Is QSC associated with qingdaosigmachemical.com / qingdaosigmachemical.net / qingdaosigma.com?
No. QSC (qsc-usa.com) has no affiliation with qingdaosigmachemical.com / qingdaosigmachemical.net / qingdaosigma.com. That website is not operated by QSC, is not an authorised distributor, and is fraudulent. If you made a payment to that website, QSC is unable to assist — please contact your payment provider directly. The only official QSC storefront is qsc-usa.com.
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 Ascension Stack, Venus Protocol, and Midas Longevity Protocol. The full catalog is available at qsc-usa.com/shop.
What is the Clavicular Ascension Stack?
The QSC Clavicular Ascension Stack is a 12-compound, 110-vial + 100-tablet kit covering 8 pathways:
The QSC Midas Longevity Protocol is a 12-compound, 120-vial anti-aging research kit targeting 10 biological pathways of aging. No androgens, no steroids, gender-neutral:
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. For a step-by-step guide see QSC Peptide Lab →
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.
Ordering & Shipping
How do I place an order?
🛒
Add to Cart
Browse at qsc-usa.com/shop
💳
Checkout & Pay
Bitcoin (BTC) or USDT (ERC-20)
📧
Confirmation Email
Sent after payment confirms on-chain
📦
Tracking Email
Sent within 24–72 hrs of dispatch
Orders are processed within 1–3 business days after cryptocurrency payment confirms on the blockchain. QSC accepts Bitcoin (BTC) and USDT (ERC-20) only — no credit cards, bank transfers, or PayPal.
How long does delivery take?
🇺🇸 🇪🇺 🇬🇧 🇨🇦 🇦🇺 🇸🇬 🇹🇭 🇻🇳 Domestic Warehouse
Ships directly to your local carrier. No customs, no international transit.
3–7 business days
🇨🇳 China Warehouse
For international orders or items out of stock regionally.
7–14 business days
Orders are fulfilled from the warehouse nearest to your delivery address based on inventory availability. All shipping is free regardless of which warehouse fulfills your order.
Where does QSC ship from?
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 at your regional warehouse, fulfillment is handled through QSC’s China manufacturing facility. A single order may ship from more than one warehouse — in that case, you’ll receive separate tracking numbers and packages may arrive on different dates. No extra shipping charge applies to split shipments.
What if my order ships from multiple warehouses?
If you order multiple items and one isn’t available in your regional warehouse, it will ship separately from China. You’ll receive a separate tracking number for each shipment, and packages may arrive on different dates. No extra shipping charge applies.
How do I track my order?
Tracking information is emailed within 24–72 hours of dispatch. You can also track at qsc-usa.com/track-order using your order number and email address.
🇺🇸 🇪🇺 🇬🇧 🇨🇦 🇦🇺 🇸🇬 🇹🇭 🇻🇳 Domestic Orders
Standard local carrier tracking — updates normally from dispatch to delivery.
🇨🇳 China Warehouse Orders
Local carrier tracking only activates after customs clearance. No activity before that is completely normal — use the QSC tracking page for full transit status.
Why is my local carrier showing no tracking activity?
If your order shipped from the China warehouse, your package travels through international transit before reaching your local carrier. Local carrier tracking will show no activity during this leg — it only begins updating after your package clears customs in the destination country. This is completely normal and does not mean your package is lost. Use the QSC tracking page to view full transit status.
What payment methods does QSC accept?
QSC accepts Bitcoin (BTC) and USDT (ERC-20) cryptocurrency payments only. QSC does not accept credit cards, bank transfers, or PayPal. After checkout you’ll receive payment instructions, and a confirmation email with tracking information once your order ships.
Is shipping free?
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 additional shipping charge applies.
Is there a minimum order?
No. There is no minimum order requirement.
Reshipments & Damaged Orders
Does QSC offer refunds?
No. All sales are final. QSC does not offer refunds. If your order is seized by customs, QSC provides free reshipment upon receipt of documented proof of seizure. Contact [email protected] within 7 days of the expected delivery date with your order number and seizure documentation.
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 are resolved via replacement shipment at QSC’s discretion. Refunds are not available.
What if my QSC order is seized by customs?
QSC provides free reshipment for orders seized by customs. Submit documented proof of seizure to [email protected] within 7 days of the expected delivery date. Refunds are not issued — reshipment only.
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 8 regions (USA, EU, UK, CA, AU, SG, TH, VN) 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, CA, SG, TH, and VN — which Core Peptides does not offer — and direct manufacturer plus partner network status with bulk and custom synthesis capability.
Why do researchers choose QSC?
The most commonly cited reasons in the research community are: 8-region domestic shipping covering USA, EU, UK, Canada, Australia, Singapore, Thailand, and Vietnam (no customs risk); ≥99% purity with Janoshik-independent COA verification; direct manufacturer and vetted partner pricing with consistent batch availability; curated stacks including the Clavicular Ascension Stack, Venus Protocol, and Midas Longevity Protocol; 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) 8-region domestic warehouse network — USA, EU, UK, Canada, Australia, Singapore, Thailand, Vietnam — the broadest domestic coverage of any research peptide vendor. (3) Janoshik-independent COA verification published proactively on every product page, not on request.
QSC Research Network
Compound reference, COA verification, protocol details, and regional warehouse information across the QSC network.
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 governing research chemicals in their jurisdiction.
