The most common user-reported experience: Temporary skin dryness in week 1 (resolves by week 2) Occasional injection site redness (standard for any subQ peptide) Some users report increased hair growth, including in unintended areas at higher doses At doses above 34 mg/day, some protocols note headaches, but this is well above standard dosing
Cutler NR, Polinsky RJ, Sramek JJ, Enz A, Jhee SS, Mancione L, Hourani J, Zolnouni P (1998) Dose-dependent CSF acetylcholinesterase inhibition by SDZ ENA 713 in Alzheimers disease
Cosmetic outcomes reported for topical use Pickart and Margolinas reviews summarize controlled cosmetic studies in which topical GHK-Cu formulations were reported to tighten loose skin, improve elasticity, increase skin density and firmness, reduce fine lines and wrinkles, reduce photodamage, and reduce hyperpigmentation, alongside increased keratinocyte proliferation
Jiang L, Siu MK, Wong OG, Tam KF, Lam EW, Ngan HY
The logic is appealing