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AHK-Cu (Alanyl-Histidyl-Lysine-Copper) is a synthetic copper peptide sometimes favored over GHK-Cu specifically for hair

However, excess selenium may contribute to oxidative stress rather than relieve it

Staresinic M, Sebecic B, Patrlj L, Jadrijevic S, Suknaic S, Perovic D, et al

It won't leave your hair greasy or flat

In addition to its many recognized biological functions, glutathione has also been associated with skin lightening ability

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