can l glutathione whiten skin Whitening capsules-L-glutathione, antioxidant, anti-aging effects Glutathione (L-Glutathione) (Reduced, China)

Powell MF, et al

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Potential Clinical Applications of GHK-Cu Peptide Canada Laboratory studies have found that GHK-Cu that GHK-Cu can have the following clinical applications: Enhances Collagen Synthesis According to studies, GHK-Cu activates fibroblasts, the skin cells that produce collagen, which greatly increases collagen production and provides anti-aging advantages

So they switched them onto the next approach

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Stimulating collagen production while allowing sun damage to break it down simultaneously produces minimal net benefit