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Days · 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.
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HPLC / MS verified purity
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Lots third-party tested
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Researchers served
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Average researcher rating
#1 Research Peptide
Retatrutide
Our best-selling triple-agonist research peptide — GIP, GLP-1 and glucagon receptor activity in a single lot-matched vial. Synthesized by solid-phase synthesis, verified to ≥99% by mass spectrometry, and backed by a downloadable Certificate of Analysis for every lot.
COA CertifiedEvery batch tested
99%+ PurityLab-verified
Same-Day ShipOrders by 2PM EST
Secure Payment256-bit encryption
USA-BasedDomestic sourcing
Shop the Catalog
66 research compounds across 9 categories — each synthesized to analytical standards and verified against a lot-matched Certificate of Analysis.
GLP-1 & Metabolic 5Research Peptides 27Peptide Blends 6Nasal Sprays 3Dissolving Strips 3Bioregulators 7Research Bundles 10Lab Supplies 5Merch 6
GLP-1 & Metabolic
5 productsResearch Peptides
27 productsPeptide Blends
6 productsNasal Sprays
3 productsDissolving Strips
3 productsBioregulators
7 productsResearch Bundles
10 productsLab Supplies
5 products
Beyond Purity
Purity testing measures one thing. We test for the four things it can't see.
Every peptide 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. A peptide can test 99.9% pure and still contain bacterial endotoxins, heavy metals, or microbial growth. The chromatogram won't show it. Most suppliers won't test for it. We do.
01 — Endotoxins
Toxic fragments left behind by dead bacteria.
Heat-stable. Survive sterilization. Biologically active on their own.
Why purity testing misses them
HPLC and mass spec measure chemistry. Endotoxins are biological remnants — invisible to both. A vial can be 99% pure and still loaded with them.
Why it matters
Endotoxins are biologically active. They trigger immune responses, inflammation, and cytokine release on their own — corrupting research data before the experiment begins.
02 — Sterility
The absence of living microbial contamination.
Cultured against USP standards. Not assumed from a clean chromatogram.
Why purity testing misses it
Purity tests don’t culture for bacteria, fungi, or yeast. Live contamination can grow in a vial that "passed" purity testing.
Why it matters
Microbial growth introduces unknown variables into every experiment. We test every batch against USP sterility standards.
03 — Heavy Metals
Lead, arsenic, mercury, and cadmium introduced during synthesis.
Inorganic. Invisible to HPLC and mass spec. Detected only by ICP-MS.
Why purity testing misses them
Heavy metals are inorganic. HPLC and mass spec are blind to them entirely. They require a separate test (ICP-MS) most suppliers skip.
Why it matters
Heavy metals accumulate in biological tissue and produce confounding effects in long-term studies. We screen for all four primary contaminants on every batch.
04 — Batch Consistency
Verification that every batch matches the last.
Multi-sample. Reference-tested. Reproducibility, audited.
Why most suppliers miss it
Spot-checking one vial per run is industry standard. We pull multiple samples per batch and test against the same reference every time.
Why it matters
Reproducibility is the foundation of legitimate research. If batches drift, your data drifts with them.
Purity is the floor. Not the ceiling.
Shop by Research Area
Not sure where to start? Explore the catalog by the pathway you're researching.
Most Popular
The research peptides our customers reorder most — led by Retatrutide, Tirzepatide and Semaglutide.
American-Owned · Built on Data
Synthesized, tested & shipped in the U.S.A.
American Peptides is built on documented quality control — produced domestically, tested before release, and fulfilled same-day from our own facility. 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.
01
Independent 3rd-Party Testing
Every batch verified by Bioviridian — HPLC-MS purity, MALDI identity, and endotoxin screening.
99.7%avg purity · last 50 batches
02
Same-Day Shipping
Orders before 2PM EST ship same day. Tracked, insured, delivered in 2–3 business days.
2–3 daysavg delivery · domestic
03
Damage & Error Coverage
Vial broken in transit or wrong product shipped? Notify us within 72 hours and we'll replace it at no cost.
72 hoursto report · free replacement
04
Made in the USA
Synthesized and packaged in GMP-compliant US facilities. Fully domestic supply chain — no imports.
100% USsynthesis · packaging · ship
05
Discreet Packaging
Plain unmarked outer box, generic return address. Statement reads as a non-descript billing descriptor.
Zeroidentifying marks · inside or out
06
Expert Support
Researchers on staff — not a script-reading call center. Reconstitution, sourcing, and COA questions welcome.
< 6 hrsavg first response · weekdays
Verified by
BioviridianHPLC-MS Lab
GMPCompliant Facility
FDA-registeredUS Manufacturer
256-bit SSLEncrypted Checkout
≤ 0.05 EU/mLEndotoxin Verified
The Testing Standard
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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.
Endotoxin Testing (LAL)
Bacterial endotoxins are invisible, heat-stable, and can invalidate an entire study — or skew your results. We screen to USP <85> pyrogen limits on every batch.
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
Research Stacks
Curated multi-compound stacks — combined at a saving versus buying each vial individually. Every component ships with its lot-matched COA.
Verified Lab Testing
Every compound is independently third-party tested, with a lot-matched Certificate of Analysis (COA) and a GHS-format Safety Data Sheet (SDS) available for download.
RETATRUTIDE (RETA)
RETATRUTIDE + CAGRILINTIDE
SEMAGLUTIDE
TIRZEPATIDE
BPC-157
GHK-Cu (Copper Peptide)
KISSPEPTIN-10
MELANOTAN-2
NAD+
P-21
SELANK
SEMAX
TESAMORELIN
THYMOSIN ALPHA-1
BPC-157 + TB-500 (Wolverine Blend)
CJC-1295 (NO DAC) + GHRP-6
CJC-1295 (NO DAC) + IPAMORELIN
TESAMORELIN + IPAMORELIN
SELANK + SEMAX NASAL SPRAY
SELANK NASAL SPRAY
SEMAX NASAL SPRAY
Melts Pro™ Selank + Semax Dissolving Strips
Why American Peptides
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 by HPLC and mass spectrometry. Each lot is characterized before release so your assays start from a known baseline.
COA on Every Lot
A lot-matched Certificate of Analysis documents identity, purity, and analytical results — available for every product, every batch.
U.S. Manufacturing
Produced in the United States under documented quality control, then tested before any vial leaves the facility. Same-day domestic shipping.
Trusted by 2,400+ Researchers
★★★★★
Purity matches the COA every time. Shipping is genuinely same-day. I've reordered 11 times and American Peptides is the only supplier I trust for my work.
Dr. M. ChenVerified Buyer · 11 orders
★★★★★
The COA-before-purchase policy is why I stay. No other domestic supplier does this. The standard American Peptides has set is what the industry should follow.
J. RiveraVerified Buyer · 8 orders
★★★★★
Ordered at 1PM, arrived 2 days later. Packaging was discreet, product was exactly as described. Real labs. Real quality.
K. PattersonVerified Buyer · 3 orders
Answers
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 research use only (RUO). They are not drugs, foods, supplements, or cosmetics, are not approved by the FDA, and are not intended to diagnose, treat, cure, or prevent any disease, or for human or veterinary consumption.
How fast do orders ship?
Orders placed before 12pm CT typically ship the same business day from our U.S. fulfillment center, in protective packaging with tracking provided. Free shipping on orders $300 and over.
How should these compounds be stored?
Store lyophilized material at -20°C, protected from light and moisture. Once reconstituted with bacteriostatic water for laboratory titration, 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.