The administration of BPC157 was well tolerated by all dogs, and no visual signs of toxicity were observed, which was consistent with our previous safety evaluation studies
10.1074/jbc.M111.325803 61
MedKoo Cat#: 574133 Name: GHK CAS#: 49557-75-7 Chemical Formula: C14H24N6O4 Exact Mass: 340.1859 Molecular Weight: 340.38 Elemental Analysis: C, 49.40
So somebody who is otherwise desensitized from heightened exposure to things that either desensitize them to caffeine or nicotine or things of this nature, even something like the ADHD medications

According to a 2018 review, GHK-Cu as a cosmetic ingredient has demonstrated the ability to:3 Tighten loose skin Reverse age-related skin thinning Repair the skins protective barrier proteins Improve skin firmness and elasticity Reduce the appearance of fine lines and wrinkles Smooth rough skin Stimulate wound healing Lessen the appearance of photodamage (sun damage), hyperpigmentation, skin spots, lesions, and more Reduce inflammation and damage from free radicals Increase hair growth and thickness Additionally, in research from 2015, the authors noted that GHK-Cu may be able to stimulate collagen, regulate the skin remodeling process, attract immune cells to the site of an injury, and restore replicative vitality to fibroblasts (a cell that helps form connective tissue) in patients whove undergone radiation therapy for cancer.2 6 GHK-Cu isnt limited to topical/cosmetic forms, however
Use a sterile, new needle with each injection