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GHK-Cu is the most-studied and appears across skin and scalp cosmetics

Active at nanomolar concentrations: Unlike many peptides that require high systemic concentrations, GHK-Cu has been shown to exert meaningful biological effects at nanomolar (10 M) concentrations making it effective even at low doses

Acetate is metabolized exclusively by glial cells, and [ 13 C]acetate is thus capable when used in combination with magnetic resonance spectroscopy or mass spectrometry, to provide information about glutamine transfer

It may provide nootropic effects by normalizing functional brain cell activity

There was, however, a noticeable spike in motivation in the B12 group