RS Synthesis

RS Synthesis is a private U.S.-based peptide synthesis company that provides custom peptide products and services to pharmaceutical, cosmetic, and broader life science research customers. Its offerings span research-scale custom peptide synthesis, cGMP/API peptide manufacturing, peptide library services, peptide modifications, catalog peptides, cosmetic peptides, and antibody-related services. The company appears to operate primarily as a service and manufacturing organization rather than a therapeutic drug developer, with commercial offerings available from milligram to kilogram scale. Based in Louisville, Kentucky, RS Synthesis positions itself as a global supplier for peptide R&D through commercialization support.