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glutathione iv skin whitening results as a agent: Facts, myths, evidence and controversies Systemic Glutathione as a Skin-Whitening
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Cambridge, MA, USA: 2020

It's worth being realistic here: Topically applied Hydrolyzed Collagen conditions the upper layers of skin rather than rebuilding the structural collagen deep in your dermis (the wrinkle-and-firmness benefits people associate with Collagen mostly come from oral supplements in studies, not topicals)

However, what many people describe as a "color change" might actually be a change in the clarity of the eye

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