However, if you need to choose one specifically for pigmentation, glutathione should be your priority
Hu P, Lee CW, Xu JP, Simien C, Fan CL, Tam M, Ramagli L, Brown BW, Lynch P, Frazier ML, Siciliano MJ, Coolbaugh-Murphy M
A comparative study of the BPC 157 beneficial effect was done with intraperitoneal application, once daily, intraperitoneally (per kg body weight) 10 g, 10 ng, or 10 pg BPC 157, while standard agents 10 mg atropine, 50 mg ranitidine, and 50 mg omeprazole provide only a weak effect
Pharmaceutical research, 16(9), 14121416
Tissue Remodeling: Unlike molecules that simply promote cell proliferation, GHK-Cu is a master regulator of tissue remodeling