Vitamin C is more established for brightening and has extensive research backing, whilst glutathione offers additional antioxidant benefits
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Reconstitution Protocol for GHK-Cu Research Researchers who buy GHK-Cu peptide from PSPeptides receive it in lyophilized (freeze-dried) powder form for maximum stability during shipping and storage
2009 Feb;26(2):128-34
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A vitamin C deficiency can also pose serious health risks