Good hair days aren’t a myth. When you take a closer look, they’re simply hiding behind the right science. Peptides: the buzzy ingredient that has massively moved from skincare royalty into my haircare routine. These tiny chains of amino acids that are hair growth actives, popping up everywhere in serums, tonics and treatments promising thicker, stronger hair. “Peptides are naturally occurring molecules composed of amino acids, the foundational units of proteins,” Michelle Green, MD , board-certified dermatologist, shared with the New York Post. “Unlike proteins, which contain 50 or more amino acids, peptides are much smaller, containing fewer than 50. Peptides may help promote hair growth. Peptides promote collagen production, a protein that can enhance follicle size and prolong the hair growth (anagen) phase.” Peptides also help repair cellular damage, which can strengthen hair follicles.…