Topical GHK-Cu seems like a waste to me. Your skin is a barrier, no way a big ass positively charged peptide like that is getting through in significant amounts. A needle bypasses that and lets you absorb 100% of what you paid for.
Injection site doesn't even matter because I've been blasting my gut with 2mg of this copper peptide every 2 days, sometimes I forget a day but that's okay it's a saturation thing. Anyway, the receding Vegeta hairline I was starting to get because of my natural 2000 Test filled back in after GHK-Cu. No local injections, no wasteful topical serums or creams or whatever BS, just a few months of gut pins @1mg/day. 26M btw and the only other stuff in my stack is Reta and MOTS-C so it wasn't those.
#697