A highly durable, elastic protein that gives tissues their ability to stretch and recoil. Elastin is abundant in skin, blood vessel walls, lungs, and ligaments. Unlike collagen, which provides tensile strength, elastin provides resilience—the ability to deform under stress and return to original shape.

A critical fact for the cosmetic peptide space: the body produces most of its elastin during fetal development and early childhood. Adult elastin production is minimal. This means elastin damage from aging, UV exposure, or inflammation is largely irreversible through natural repair. Several cosmetic peptides claim to “stimulate elastin production” (including Palmitoyl Hexapeptide-12, derived from the elastin sequence VGVAPG), but the clinical evidence that topical peptides can meaningfully restore adult elastin architecture is limited.