From our results, we observed that GHK-Cu exhibits low potential of inducing skin irritation response in comparison with CuCl 2 and Cu(OAc) 2
Joshi, Pratibha C., and David M
If you read content stating that GHK-Cu injectable is illegal in the United States, including our own earlier version of this post, that information is outdated as of April 2026
Our criteria: After researching, corresponding with brands, and combing through customer reviews, our editors have chosen the best clean and effective glutathione supplements to support cellular health and antioxidant defense
GHK-Cu functions at the molecular level by affecting gene expression and cellular pathways involved in tissue repair, inflammation control, and oxidative stress reduction
This provides no additional benefit and may cause irritation or copper excess locally