40 companies are listed as peptide manufacturers and suppliers in the United States. 4 hold active US Drug Master Files for peptide APIs, most often for Glatiramer, Semaglutide, Bivalirudin. 2 have a regulator record of GMP manufacturing. 8 score High (90 or more). 9 listings carry an open FDA warning letter, which caps the score at 60.
Ordered by score. Scores follow the published rules and are not affected by paid placement. Updated 2026-11-13.
RK Pharma subsidiary offering API process R&D, custom synthesis and generic APIs, with US offices and plants in Gujarat and Andhra Pradesh. Holds US DMFs for 6 peptide APIs.
US peptide API CDMO with facilities in the US and China.
California peptide synthesizer maker founded 1993 that also runs a cGMP peptide CDMO site in Milpitas; US DMF for triptorelin.
US generics, specialty and biosimilars company with operations in the US, India and Ireland; US DMF for glatiramer acetate.
Fremont, California peptide maker founded in 1993, now a subsidiary of Kaneka Eurogentec, offering catalogue, custom and GMP-grade peptides and assay kits.
Texas custom synthesis company in business since 1984, making peptides, oligonucleotides and bioconjugates at its Lewisville facility.
Life-science services company with a large custom peptide synthesis service.
Thermo Scientific custom peptide service making research peptides of 2-110 amino acids by Fmoc solid-phase synthesis, plus peptide libraries and AQUA heavy peptides.
New Jersey contract research company founded in 2008 that makes custom peptides, peptide conjugates and PNAs, and also provides protein and antibody services.
Resellers of research-use-only peptides. Products are not for human consumption.
Research compound store run by Vertex Labs LLC, with lot-by-lot COAs hosted by Freedom Diagnostics and lookup by vial lot or lab accession number.
New York-based research peptide seller with a COA library indexed by its own batch codes, citing Verum Analytics as the testing lab.
Houston-based seller of research peptides and blends with lot-numbered COAs from Janoshik Analytical and endotoxin data listed per product.
Online seller of research-use peptides and blends with batch COAs from Janoshik Analytical and US labs, plus a rotating heavy metal, endotoxin and sterility panel.
Family-run Texas LLC selling research peptides since 2024, with batch records from Freedom Diagnostics, Kovera, MDx and Precision Mass Spec.
Orlando-based seller of 100+ research peptides and blends, with batch COAs from Vanguard Laboratory (HPLC purity only).
Wyoming LLC selling research peptides to registered customers, claiming a per-batch ISO 17025 lab panel with endotoxin, sterility and residual TFA.
Research peptide store operated by Xcel Research LLC that sells only to registered researchers, with third-party testing claimed but no lab named.
Austin, Texas seller of research peptides, aminos, bioregulators and neuroactives, claiming US lyophilization and testing by three outside labs.
Kansas City research peptide store with a library of about 122 downloadable COAs; the testing lab is not named in page text.
Ohio research peptide seller with COAs from SafeCert, BioRegen (COA number plus security key) and AV Analytics; also sells capsules and creams.
Las Vegas-listed seller of lyophilized research peptides such as AOD-9604 and BPC-157, claiming third-party HPLC-MS batch testing.
Austin, Texas seller of research peptides such as retatrutide, Semax, Selank and GLOW, with batch COAs from Janoshik and ACS Laboratories.
Wyoming LLC selling 100+ research peptides and blends with Janoshik COAs carrying task numbers and keys, plus sterility, endotoxin and heavy-metal testing.
Pensacola, Florida seller of research peptides, blends, capsules, sprays and bioregulators, with professional pricing behind login.
Idaho-based research peptide seller with batch-numbered, QR-linked COAs from US labs (Vanguard, Chromate, Freedom Diagnostics) and some capsule products.
Wyoming-registered online seller of research peptides, with COAs from Janoshik and Freedom Diagnostics and products grouped by research goals such as fat loss.
Scottsdale research peptide seller with lot-numbered COAs from Vanguard, Eagle Analytical and others, covering sterility and endotoxin; also sells capsules.
Georgia seller of research peptides, blends, BPC-157 capsules and aerosol misters, claiming per-lot purity, heavy metal, endotoxin and sterility testing.
St. Petersburg, Florida seller of research peptides plus capsules, tablets and liquid sprays, with Kovera and Freedom Diagnostics reports.
Florida research peptide seller operated by Melex Technologies Inc., with a lot/accession COA archive and sterility and endotoxin data on COAs from May 2026.
Connecticut research chemical seller of SARMs and peptides, citing MZ Biolabs and Colmaric Analyticals for HPLC and mass-spec testing.
Online research peptide store with categories such as fat loss and muscle performance; FDA warning letter (March 2026) gives a Rancho Santa Fe, CA address.
Florida research peptide store run by Lovega LLC with 50+ products and third-party testing claims; open FDA warning letter from March 2026.
Colorado research peptide seller with lot-coded COAs (Chromate verify links, Kovera, Vanguard), a 15-test panel and spray/capsule products. Open FDA letter.
Research peptide store (pppepz.com) behind an age gate; FDA warning letter (August 2026) names founder and a Phoenix, Arizona address.
Sarasota research peptide store run by Pirsek Technologies LLC, publishing purity, endotoxin, heavy-metal and sterility files; open FDA warning letter.
Login-only research peptide store claiming third-party testing; FDA warning letter (March 2026) lists a Scottsdale, Arizona address.
Florida research peptide seller with COAs linked to Janoshik verification pages and its own batch codes; also sells capsules and tablets. Open FDA letter.
Texas research peptide store run by TXP Innovations LLC that claims third-party testing; it received an FDA warning letter in August 2026.
Login-only wholesale research peptide supplier powered by Sterling Path LLC in Brooksville, Florida; claims per-batch purity, identity and endotoxin tests.
40 companies. Each listing shows location, business model, documentation and a score from 0 to 100.
By score: Apicore LLC (RK Pharma) (98), AmbioPharm (95), Amneal Pharmaceuticals LLC (90), AnaSpec (90), Bio-Synthesis Inc (90). Scores measure checkable evidence, not product quality, and paid placement does not change them.
Apicore LLC (RK Pharma), AmbioPharm, Amneal Pharmaceuticals LLC and C S Bio Co (CSBio) hold active Type II DMFs for peptide APIs in FDA's DMF list. A DMF is a confidential file submitted to FDA; FDA does not approve DMFs, but drug applications can reference them.
Confirm the legal entity, ask for lot-specific certificates of analysis that the testing lab can verify, check FDA warning letters and import alerts, and for GMP material ask for regulator inspection records rather than marketing claims.