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Feature Comparison Primary use GHK Cu: Anti ageing, skin renewal and repair AHK Cu: Hair growth, scalp health and anti ageing Stability GHK Cu: Less stable AHK Cu: More stable with longer lasting activity Collagen support GHK Cu: Supports fibroblasts and elasticity AHK Cu: Supports fibroblasts and extracellular matrix proteins Hair growth GHK Cu: More skin focused AHK Cu: More targeted to hair follicle and scalp applications Best formulations GHK Cu: Serums and creams AHK Cu: Hair serums, scalp tonics and treatments Available forms GHK Cu: Powder and liposomal forms AHK Cu: 99% powder and 7% or 10% liposomal forms

Most patients tolerate hydroxocobalamin injections well

This synthetic peptide consists of the C-terminal fragment (amino acids 176-191) of human growth hormone with an additional tyrosine residue at the N-terminus, designed to retain the lipolytic properties of growth hormone while avoiding its growth-promoting effects

Some people experience slight soreness at the injection site or mild nausea

Researchers specifically targeting skin aging should consider GHK-Cu as the primary copper peptide, potentially adding AHK-Cu if scalp health is also a concern