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GHK-Cu is classified as a cosmetic ingredient, not a drug
The difference is in the research target
5 PMC NAD+ Pharmacology & ImplicationsPharmacology and potential implications of NAD+ metabolism, aging and therapeutics
One can take glutathione tablets or other oral supplements with water at any time, preferably early morning or at bedtime
Improved cognition: Some studies suggest that glutathione can help improve memory and mental clarity by protecting brain cells from damage
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