There are different types of peptides - performing different roles in topical skincare. Biomimetic peptides are short-chain amino acids that mimic naturally-occurring protein - the building blocks that comprise skin’s structure. The Biomimetic Peptide – Acetyl Tetrapeptide-3 — in The Scalp Serum is a signal peptide that helps trigger skin’s own ability to create collagen and optimize hair follicle health.