Placebo-controlled clinical trials of topical GHK-Cu have documented reductions in fine lines, improvements in skin laxity, and increased keratinocyte proliferation over 12-week protocols
It is uncommon for insurance to cover these treatments, but you can use your HSA
For skin specifically, GHK-Cu has become one of the most studied peptides in cosmetic dermatology
GLP-1 side effects: What to expect when starting
Journal of Pharmacology and Experimental Therapeutics, 325(3), 825-834
Additionally, glutathione delivered through inhalation or IV (intravenous) methods has occasionally caused respiratory issues, particularly in people with asthma