RESEARCH-GRADE PEPTIDES
Purity You Can Verify.
Quality You Can Trust.
Analytical-grade peptides, independently third-party tested with a Certificate of Analysis on every lot. Built for serious research.
SHOP THE CATALOG
The Research Catalog
Analytical-grade research peptides, grouped by research category. Every vial ships with its lot-matched Certificate of Analysis.
BEYOND PURITY
What “99% pure” doesn’t tell you.
Every supplier publishes a purity number. But HPLC and mass spectrometry — the tests behind that number — were never designed to detect contamination. They measure the molecule, not what’s around it. Most suppliers stop at purity. We test for the four things it can’t see.
Endotoxins
Bacterial remnants invisible to HPLC and mass spec — yet biologically active enough to corrupt research data before the experiment begins.
Sterility
Live microbial contamination that purity tests never culture for — screened to USP standards on every batch, never assumed from a clean chromatogram.
Heavy Metals
Lead, arsenic, mercury, cadmium — inorganic contaminants that require ICP-MS screening, a test most suppliers skip entirely.
Batch Consistency
Multiple samples pulled per batch, tested against the same reference every time — so vial 900 matches vial 1.
Purity is the floor. Not the ceiling.
BESTSELLING COMPOUNDS
The research peptides our customers reorder most.
Our best-selling compounds — every vial backed by a lot-matched Certificate of Analysis.
SHOP BY RESEARCH AREA
Find your compound.
Explore the catalog by the pathway you’re researching.
GLOBAL SUPPLY · BUILT ON DATA
Synthesized, tested & shipped worldwide.
Chinapeptides is built on documented quality control — produced under GMP-compliant processes, tested before release, and fulfilled with tracked worldwide shipping. When you order, you get the analytical paperwork to match.
WHY RESEARCHERS CHOOSE US
Six commitments. Independently verified.
Every one backed by a number, not a claim.
Independent 3rd-Party Testing
Every batch verified by HPLC-MS purity, MALDI identity, and endotoxin screening.
Same-Day Shipping
Orders before 2PM ship the same day. Tracked, insured, delivered worldwide.
Damage & Error Coverage
Vial broken in transit or wrong product shipped? Notify us within 72 hours for a free replacement.
Documented Quality Control
Synthesized and packaged under GMP-compliant processes. Full chain of custody — no black boxes.
Discreet Packaging
Plain unmarked outer box, generic return address, non-descript billing descriptor.
Expert Support
Researchers on staff — not a script-reading call center. Reconstitution, sourcing, and COA questions welcome.
THE TESTING STANDARD
Seven layers. Zero compromises.
Most sellers ship on a supplier’s word. We put every single batch through seven independent layers of third-party testing — and if any layer fails, that batch never reaches you.
Sterility
USP <71> sterility testing runs a full 14-day incubation plus inspection — because slow-growing microorganisms simply don’t appear in a rushed 2-day check. For sensitive research material, that patience is the whole point.
Endotoxin Testing (LAL)
Bacterial endotoxins are invisible, heat-stable, and can invalidate an entire study — or skew your results. We screen every batch to USP <85> pyrogen limits.
Purity — HPLC
High-performance liquid chromatography confirms ≥99% purity and quantifies every impurity present. A clean peak isn’t assumed — it’s measured and printed on the COA.
Heavy Metals — ICP-MS
Inductively-coupled plasma mass spec screens for lead, arsenic, cadmium, and mercury down to trace limits — contaminants that carry over from raw materials if no one checks.
Identity — Mass Spectrometry
Mass spec confirms the molecular weight matches the exact peptide sequence claimed on the label — proving it is what it says it is, not a cheaper substitute.
Batch Consistency
Every batch is tested in full — never one sample tested once and the rest assumed. Identity and concentration are verified so vial 900 matches vial 1.
Quantity Verified — Net Content
The milligrams on the label are the milligrams in the vial. Fill mass and net peptide content are assayed on every batch — a 10 mg vial is verified to contain 10 mg, not “approximately.”
INDEPENDENT THIRD-PARTY VERIFIED — EVERY BATCH, NO EXCEPTION
VERIFIED LAB TESTING
Every compound. Every lot. Proven.
Every compound is independently third-party tested, with a lot-matched Certificate of Analysis (COA) available for download. No request needed — the paperwork is public.
WHY CHINAPEPTIDES
We publish the proof.
Every product is backed by analytical testing and lot-level documentation — no guesswork, no black boxes.
Analytical Purity
≥99% purity, verified twice.
Why purity testing misses it — ≥99% purity verified by HPLC and mass spectrometry.
Why it matters — Each lot is characterized before release so your assays start from a known baseline.
COA on Every Lot
Identity, purity, and results — documented.
Why purity testing misses it — A lot-matched Certificate of Analysis is produced for every batch.
Why it matters — Identity, purity, and analytical results travel with the vial — available for every product, every batch.
Documented Quality Control
Tested before any vial leaves the facility.
Why purity testing misses it — Production runs under documented, GMP-compliant quality control.
Why it matters — Compounds are tested before release, then shipped tracked with protective packaging.
ANSWERS
Questions, answered.
Are these products third-party tested?
Yes. Every lot is tested for identity and purity before it ships, and a lot-matched Certificate of Analysis (COA) is available for each product. Purity is verified by HPLC and mass spectrometry to ≥99%.
What does ‘Research Use Only’ mean?
All products are supplied strictly for laboratory and in-vitro research use only. They are not drugs, foods, supplements, or cosmetics, and are not intended for human or veterinary use.
How fast do orders ship?
Orders placed before 2PM typically ship the same business day in protective packaging with tracking provided. Free worldwide shipping on orders over $150.
How should these compounds be stored?
Store lyophilized material at -20°C, protected from light and moisture. Once reconstituted for laboratory use, refrigerate at 2–8°C. Always consult the product COA for compound-specific handling.
Do you provide a Certificate of Analysis?
Yes — a lot-matched COA is available for every product and every batch, documenting identity, purity, and analytical results. Contact our team if you need the COA for a specific lot.
on orders by 2PM
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Ready to put your research on verified ground?
Join 15,000+ researchers who start from a known baseline — not a supplier’s word.