Peptide?

biologically occurring short chains of amino acid monomers linked by peptide (amide) bonds

Generally, composition of <50 amino acids is classified as peptide while> 50 amino acids is accepted as protein.

Peptides are recognized for being highly selective and efficacious and, at the same time, relatively safe and well tolerated. .

Currently, there are more than 60 US Food and Drug Administration (FDA)-approved peptide medicines on the market and this is expected to grow significantly, with approximately 140 peptide drugs currently in clinical trials and more than 500 therapeutic peptides in preclinical development.