real glutathione L-Glutathione (GSH) 1500mg Holika Holika The Real Mask

While injectable GHK-Cu has prospects in specific therapeutic uses, it doesn't have enough research to support its efficacy for skin or hair concerns

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Evid Based Complement Alternat Med (2020) 2020:1303524

Since similar enhancement of collagen synthesis was shown for the tripeptide in complex with copper (see below) it was not clear whether the activity was intrinsic to GHK or whether it was resulting from the formation of active copper complexes due to the presence of copper ions in the tissue culture medium

J Fish Biol