Hair Rescue: Repair is a combination of two potent peptides, GHK-Cu and Zn-Thymulin. In studies, GHK-Cu has been shown to strengthen existing hair by stimulating growth in areas that are lacking thickness. Zn-Thymulin is a combination of Zinc and a nonapeptide called Thymulin. Together, Zn-Thymulin may extend the anagen phase of hair follicles and reduce hair loss associated with a zinc deficiency.