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Description
Metaxas et al., 2017

But "well tolerated" here borrows heavily from the broader copper-peptide class and from cosmetic use, because AHK-Cu has very little dedicated safety data of its own

These findings support a personalised approach, where absorption efficiency may be more relevant than absolute dosage

Without enough, we can get anemia and other serious health problems
If what you want is a cosmetic product for occasional, localized skin concerns, then a topical fits the bill