Peptides, which are short chains of amino acids, have gained popularity in recent years for their role in supporting hair health. Scientifically, peptides are thought to promote hair growth and strength by stimulating the production of key proteins found in hair follicles, such as keratin and collagen. Some laboratory and clinical studies suggest that topical application of certain peptides (like copper peptides or biomimetic peptides) may help prolong the anagen (growth) phase of the hair cycle, improve follicle health, and increase hair density.

For example, copper peptides have been shown in small-scale studies to increase follicle size and reduce hair loss by enhancing blood flow and reducing inflammation in the scalp. Other peptides, such as palmitoyl tetrapeptide-7, are included in cosmetic formulations with claims of improving scalp condition and stimulating growth, though evidence from large, well-controlled clinical trials is limited. Most available research supports only modest benefits, and results can vary depending on the specific peptide used and formulation.

Overall, while initial scientific evidence supports the potential benefits of peptides for hair health, more comprehensive clinical studies are needed to confirm efficacy and determine optimal use. The use of peptides for hair is based on emerging scientific validation rather than traditional use.