Manufacturers that make peptides to your sequence, from research milligrams to GMP batches.
33 companies are listed as custom peptide synthesis companies. 17 hold active US Drug Master Files for peptide APIs, most often for Semaglutide, Tirzepatide, Octreotide. 10 have a regulator record of GMP manufacturing. 18 score High (90 or more). 1 listing carries 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.
Privately owned Barcelona peptide CDMO founded in 1989, making GMP generic peptide APIs and custom NCE peptides. Holds US DMFs for 10 peptide APIs.
Gwangju peptide API maker founded in 2000 as Anygen, KOSDAQ-listed since 2016, with MFDS-approved GMP peptide plants; holds US DMFs for ganirelix and vasopressin.
US peptide API CDMO with facilities in the US and China.
Greek peptide manufacturer producing GMP and non-GMP peptides and resins.
Belgian biotech firm and CDMO, part of Kaneka, selling research peptides, oligos and antibodies and running GMP manufacturing that it says is FDA inspected.
Peptide-focused CDMO running GMP manufacturing sites on three continents.
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.
Mumbai peptide API maker acquired by Piramal Pharma in 2021; its oxytocin API is WHO-prequalified; US DMF for oxytocin.
Osaka-based maker of research peptides, glyco compounds and amino acid reagents since 1977, also offering custom synthesis and GMP peptide drug development.
German peptide maker founded in 2001 near Berlin, selling catalogue peptides and peptide pools and offering custom synthesis on in-house built synthesis robots.
Korean peptide drug developer founded in 1997 that also runs an ISO 9001-certified custom peptide synthesis service and markets a 3.75 mg depot injection.
Heidelberg company founded in 2000 that synthesizes custom peptides and produces specific antibodies from the Heidelberg Technology Park.
Shenzhen peptide CDMO and API maker founded in 2009, with 13 cGMP lines and 85,000 L of SPPS/LPPS reactor volume. Holds US DMFs for 6 peptide APIs.
Suzhou peptide API and formulation maker founded in 2000, flagship of Tianma Pharma Group, offering CRO/CMO/CDMO services. Holds US DMFs for 8 peptide APIs.
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.
UK lab in Redditch that synthesizes custom research peptides and peptide libraries and also runs UKAS-accredited amino acid analysis and protein sequencing.
Canadian life science research supplier, headquartered in Markham, Ontario and Amherst, New York, offering custom and GMP peptide and oligo synthesis.
Shanghai maker of protected amino acids, custom and catalogue peptides, drug peptides, cosmetic peptides and antibodies, with eight production bases.
Hangzhou peptide maker founded in 2014 offering pharmaceutical, cosmetic and catalog peptides plus peptide CRO/CDMO work; holds an active US DMF for semaglutide.
Hangzhou peptide developer offering peptide APIs, intermediates, impurities and ADC/PDC linkers plus custom synthesis and process development; holds an active US DMF for tirzepatide.
Tübingen peptide company with about 30 years in peptide synthesis, making custom peptides, libraries, arrays, PNAs and neoantigen vaccine peptides.
Berlin peptide maker offering custom synthesis, peptide catalogues, peptide pools, microarrays and pre-GMP peptides, with a TÜV Rheinland-certified ISO 9001 system.
New Jersey contract research company founded in 2008 that makes custom peptides, peptide conjugates and PNAs, and also provides protein and antibody services.
Ningxia API and peptide maker founded in 2016 in Pingluo, offering peptide API development and manufacturing; holds US DMFs for semaglutide and tirzepatide.
UK custom peptide maker trading as Peptide Synthetics. It says it synthesizes every peptide in its own Hampshire laboratory and outsources none.
Weihai Sino-US joint venture founded 2016 making peptide APIs and cosmetic peptides; US DMFs for leuprolide and semaglutide.
Shenzhen peptide company founded in 2020 making GLP-1 peptide APIs, sterile vials and peptide reference materials at a Zhongshan plant; holds an active US DMF for tirzepatide.
Leshan-based peptide producer founded in 2015 with SPPS and LPPS lines; holds US DMFs for eptifibatide, semaglutide and tirzepatide.
Suzhou peptide CRDMO with GMP workshops built to ICH Q7; US DMFs for semaglutide and tirzepatide.
Harbin peptide API maker founded in 2011. Holds US DMFs for 11 peptide APIs. FDA issued it a CGMP warning letter in May 2026 that remains open.
33 companies. Each listing shows location, business model, documentation and a score from 0 to 100.
By score: Apicore LLC (RK Pharma) (98), BCN Peptides SA (98), HLB Pep Co., Ltd. (formerly Anygen Co., Ltd.) (98), AmbioPharm (95), CBL Patras (95). Scores measure checkable evidence, not product quality, and paid placement does not change them.
Apicore LLC (RK Pharma), BCN Peptides SA, HLB Pep Co., Ltd. (formerly Anygen Co., Ltd.), AmbioPharm, CBL Patras, PolyPeptide Group, Hemmo Pharmaceuticals Pvt Ltd (Piramal Pharma Solutions), Shenzhen JYMed Technology Co., Ltd. (JYMed Peptide), Suzhou Tianma Pharma Group Tianji Bio-Pharmaceutical Co., Ltd., Hangzhou Go Top Peptide Biotech Co., Ltd. and 7 more 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.