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In GHK-Cu, it denotes that the tripeptide glycyl-L-histidyl-L-lysine (GHK) is bound to a copper(II) ion, forming the copper-peptide complex researchers study the Cu specifically distinguishes the copper-bound complex from the standalone GHK peptide, which research has shown behaves differently without the copper ion attached

S-acetyl glutathione is typically dosed lower (100-300 mg) than reduced glutathione because of its theoretically better absorption, though head-to-head clinical comparisons with other forms are limited

Without the cells, none of that gene activity changes anything

So what exactly is glutathione