Polypeptide.ltd provides a full spectrum of high-quality peptide services, ranging from custom peptide synthesis (research and cGMP grade with regular and express deliveries) to high-throughput peptide library service. With access to state-of-the-art equipment and experienced chemists using the latest technologies, we have delivered over 118,000 custom peptides to more than 3,300 scientists worldwide. Now, we have become the first vendor in the peptide industry to be able to deliver peptides in as little as 5 days at 100% guaranteed quantity to meet the ever-increasing peptide needs in biological and drug discovery research.