Tripeptide‑29 is a synthetic collagen‑mimicking tripeptide composed of the amino acids glycine, proline and hydroxyproline, which correspond to the repeating Gly‑Pro‑Hyp motif found in human type I collagen. Modern peptide synthesis allows this collagen fragment to be manufactured from non‑animal raw materials to produce a pure, low‑molecular‑weight peptide. Because of its small size, Tripeptide‑29 can penetrate the upper layers of skin more readily than whole collagen molecules and acts as a cell‑signalling peptide: fragments of collagen “trick” dermal fibroblasts into sensing collagen breakdown and stimulate new collagen production. This suggests it may help restore dermal matrix integrity, reduce fine lines and improve skin firmness. Its origin and purity have low antigenicity, making it a suitable anti‑ageing active for vegan and cruelty‑free cosmetics.

In skin‑care formulations, Tripeptide‑29 is marketed as an anti‑ageing and hydrating active. In addition to stimulating collagen synthesis, the peptide demonstrates a double moisture‑holding effect and helps enhance the skin’s water retention, giving a plumping and smoothing feel to dehydrated skin. Some in vitro studies and supplier reports also suggest antioxidant, anti‑glycation and anti‑inflammatory actions: the peptide may scavenge reactive oxygen species, inhibit matrix metalloproteinases and reduce accumulation of advanced glycation end products, thereby slowing extracellular matrix degradation. These properties imply potential soothing and barrier‑support benefits in sensitive or mature skin. In hair‑care, marketing claims highlight the ability of Tripeptide‑29 to strengthen hair fibres, improve elasticity and colour stability, lock in moisture and reduce frizz, leading to fuller‑looking hair. The peptide is thus incorporated into leave‑in conditioners, primers and volumizing treatments where it nourishes and fortifies the hair shaft.