I would not recommend injecting GHK-Cu. We just have little information on human injections. GHK-Cu passes the stratum corneum rather easily, so just using the product on your skin, should put some GHK-Cu into your body. And GHK-Cu works at 1 nanomolar on cells. The Russian anti-anxiety studies in rats found GHK strongly affects the rats within 12 minutes at a dosage that would correspond to 35 micrograms in humans.