The two peptides share the copper-tripeptide structure, so a degree of read-across is biologically reasonable but "GHK-Cu does X, therefore AHK-Cu does X" is an inference, not a finding
In a recent study, AHK-Cu was found to stimulate the elongation of human hair follicles ex vivo and the proliferation of dermal papilla cells (DPCs) in vitro[2]
Vision disturbances : B12 deficiency may cause vision disturbances, possibly due to damage to the optic nerve (29) Because vitamin B12 deficiency symptoms arent specific to the condition, it may go undetected or get misdiagnosed
Clinical trial protocols allowed a scheduled weekly dose missed by 5 days or fewer to be taken when remembered
They're both likely to be good for anti aging , dry skin , brightening skin , sensitive skin and better texture
Brain Res 2009