GHK-Cu works on the follicle itself: it enlarges hair follicle size, strengthens follicles at the structural level reducing the miniaturization that drives androgenetic alopecia and stimulates angiogenesis to improve blood supply to the scalp
The 2025 IV pilot measured cardiac, hepatic, renal, thyroid, and glucose biomarkers and reported no abnormalities (Lee et al., 2025), which gives a sense of what those investigators considered worth checking
Methylcobalamin, on the other hand, is bioactive, meaning its ready for your body to put to work immediately
Sending the Right Signals for Renewal At its core, GHK-Cu is a signaling peptide
When product labels or social media content refer to copper peptide before and after, they are typically describing GHK-Cu, which is the primary copper-binding peptide researched for skin and hair applications