Sitohang IBS, Ninditya S.Dermatol Res Pract
Unlike synthetic signal peptides, GHK itself is endogenous, meaning the body already recognizes it as part of its repair cascade
Limited data exists for: Understudied Populations: Adults over 75 years (increased sensitivity to appetite suppression) Adolescents (ongoing development considerations) Individuals with BMI under 27 (insufficient safety data) Pregnant or lactating individuals (no safety data) Individuals with significant psychiatric conditions Gender Considerations: Research suggests some metabolic peptides may show differential effects between males and females, though data for cagrilintide and retatrutide specifically remains limited
Subcutaneous injection delivers GHK-Cu systemically, which makes more sense for wound healing and skin remodeling protocols
Although the majority of users do not find any problem with it, some report getting red patches or reddening following its use
Subcutaneous injection bypasses the penetration problem entirely but delivers the peptide systemically rather than locally