Manufacturer · Partner Network · Distributor · 100+ Countries
About QSC
QSC is an international research peptide manufacturer and partner-sourced supplier. Core peptides are produced in-house in China, while a vetted manufacturing partner network expands the catalog further. Every product — whether in-house or partner-sourced — is verified at ≥99% purity and distributed from domestic warehouses in the USA, EU, UK, Canada, and Australia.
⚠️ Scam Website Warning
QSC has no affiliation with qingdaosigmachemical.com. That website is not operated by QSC, is not an authorised distributor, and is fraudulent. It is now offline. 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.
HPLC + MS verification · Janoshik COA on every product page · Uniform QC across all sources
5-Region Warehouses
USA · EU · UK · Canada · Australia · Domestic delivery, no customs
100+ Countries
China warehouse international shipping for remaining markets worldwide
What Is QSC?
QSC is a peptide-focused manufacturer and partner-sourced supplier specialising in high-purity research peptides and specialty research compounds. Founded in China, QSC has grown into one of the most recognised peptide suppliers in the global research community, supplying laboratories and distributors in more than 100 countries.
QSC operates a dual sourcing model. Core peptides are produced in-house — from raw amino acid starting materials through solid-phase peptide synthesis (SPPS), preparative HPLC purification, analytical verification, and lyophilization. To expand its catalog and meet growing demand, QSC also partners with rigorously vetted manufacturers. All partner-sourced products undergo the same QSC quality control pipeline — HPLC purity analysis, mass spectrometry, impurity profiling, and Janoshik-verified COA documentation — ensuring identical standards regardless of production origin.
Orders are fulfilled from the warehouse nearest to the delivery address based on inventory availability. If a product is not in stock locally, fulfillment is handled through QSC’s China manufacturing facility. Orders containing multiple items may ship from more than one warehouse — in these cases, separate tracking numbers are issued and shipments may arrive on different dates.
Manufacturing & Partner Capabilities
In-House Synthesis
Automated SPPS (solid-phase peptide synthesis) · Custom peptide synthesis · Specialty research compounds · Raw peptide powders · Lyophilized formulations
Partner Network
Rigorously vetted manufacturing partners · Expanded compound catalog · Same QSC QC pipeline applied to all partner products · Full batch traceability
Unified Quality Control
Preparative and analytical HPLC · Mass spectrometry (MS) molecular verification · Impurity profiling · Full lyophilization production lines · Batch traceability · Identical QC process for in-house and partner-sourced products
Ordering & Shipping Process
From checkout to delivery — here’s exactly how every QSC order works.
Step 1 — Place Your Order
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Add to Cart
Browse and add items at qsc-usa.com/shop
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Checkout & Pay
Pay with Bitcoin (BTC) or USDT (ERC-20)
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Order Confirmation
Confirmation email sent after payment confirms
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Tracking Email
Tracking info sent within 24–72 hours of dispatch
Orders are processed within 1–3 business days after cryptocurrency payment is confirmed on the blockchain.
Step 2 — Delivery Timelines
🇺🇸 🇪🇺 🇬🇧 🇨🇦 🇦🇺 Domestic Warehouse
Ships directly to your local carrier — no customs, no international transit.
3–7 business days
🇨🇳 China Warehouse
Used for international orders or when an item is out of stock at your regional warehouse.
7–14 business days
Local carrier tracking activates after customs clearance — no activity before that is normal.
⚠️ Split shipments: If you order multiple items and one isn’t available in your regional warehouse, it may ship separately from China. You’ll receive separate tracking numbers — packages may arrive on different dates. No extra shipping charge applies.
⚠️ China warehouse tracking: Local carrier tracking will show no activity while your package is in international transit. This only updates after customs clearance at your destination — this is completely normal.
Region
Warehouse
Delivery
Customs
🇺🇸 United States
US Domestic
3–7 business days
None required
🇪🇺 European Union
EU Domestic
3–7 business days
None required
🇬🇧 United Kingdom
UK Domestic
3–7 business days
None required
🇨🇦 Canada
CA Domestic
3–7 business days
None required
🇦🇺 Australia
AU Domestic
3–7 business days
None required
🇨🇳 All other countries
China (Direct)
7–14 business days
Varies by country
Quality Verification Standards
Every QSC peptide batch — whether in-house or partner-sourced — is verified before distribution. Certificates of Analysis are published directly on each product page and independently verifiable via the Janoshik portal.
HPLC Purity
≥99% specification · Peak area analysis
Mass Spectrometry
Molecular identity confirmation
Impurity Profiling
Deletion sequences, oxidation products
Batch Traceability
Janoshik-verifiable COA per batch
Frequently Asked Questions
What is QSC?
QSC is a research peptide manufacturer and partner-sourced supplier based in China. Core peptides are produced in-house using SPPS, and QSC also partners with rigorously vetted manufacturers to expand its catalog. All products undergo the same QSC quality control process. QSC distributes globally from 5 regional warehouses, supplying laboratories in more than 100 countries. Popular products include Retatrutide, Tirzepatide, Semaglutide, HGH, BPC-157, and the Clavicular Stack.
Is QSC a 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, verified, and lyophilized in-house. 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.
Is QSC associated with qingdaosigmachemical.com?
No. QSC (qsc-usa.com) has no affiliation with qingdaosigmachemical.com. That website is not operated by QSC, is not an authorised distributor, and is fraudulent. It is now offline. 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.
What is the Clavicular Stack?
The QSC Clavicular Ascension Stack is a 12-compound, 110-vial + 100-tablet extended research kit covering 8 biological 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:
Every QSC product page links directly to a Janoshik-verified COA entry. Click the COA link on any product page to open the independent Janoshik verification record — this confirms that the test was conducted by an independent laboratory and the results are authentic.
What payment methods does QSC accept?
QSC accepts Bitcoin (BTC) and USDT (ERC-20) cryptocurrency payments only. Order confirmation and tracking details are sent by email after payment is confirmed on the blockchain.
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.
