LifeTein

LifeTein, LLC is a custom peptide, protein, and antibody synthesis company headquartered at 100 Randolph Road in Somerset, New Jersey, distinguishing it from the majority of vendors profiled on Peptides.SO — rather than selling a fixed retail catalog of standard research peptides, LifeTein operates as a made-to-order synthesis service for laboratories, spanning peptide chain lengths from 5 to 170 amino acids and production scale from milligram to kilogram quantities.

The company's service scope is unusually broad for the category: specialty modifications include fluorescent (FITC) labeling, biotinylation, phosphorylation, cyclization, cell-permeable peptide design, D-amino acid substitution, peptide stapling, and multiple antigenic peptide (MAP) construction, alongside peptide-nucleic acid (PNA) conjugates, peptide-oligonucleotide conjugates, stable isotope-labeled peptides for mass spectrometry standards, and peptide library synthesis. LifeTein additionally offers gene-to-protein expression services in both E. coli and mammalian expression systems, and custom antibody development (polyclonal, monoclonal, and rabbit monoclonal), backed by free peptide-antigen design consultation for antibody projects. Its proprietary "PeptideSyn" microwave-assisted synthesis technology underpins a stated rush-turnaround capability of 3-5 days for standard orders, with the company noting it has synthesized peptides up to 169 amino acids in length as a record achievement.

On quality control, LifeTein states its in-house PhD scientists analyze each synthesized peptide via HPLC and mass spectrometry, and the company cites its research having been referenced in high-profile journals including Cell, Nature, and Nature Communications. LifeTein also promotes a "No Success, No Fee" guarantee for technically difficult synthesis projects — a risk-sharing structure not typically offered by catalog-based research peptide retailers.