Glycyl-l-histidyl-l-lysine, also known as GHK, is a tripeptide composed of glycine, histidine, and lysine. With a molecular weight of 340.42, it is recognized for its potential skin-renewing properties. GHK has been studied for its purported role in promoting wound healing and tissue repair, making it a sought-after ingredient in skincare formulations aimed at supporting skin regeneration and rejuvenation.