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D.KhanalS.LeeE.ChoiJ.BoharaG.RimalN.et al (2025)

As a skin whitening agent, glutathione helps to reduce melanin production, resulting in a lighter, more even skin tone

One of the major roles of vitamin C is as an antioxidant, protecting cells of the immune system from damage due to oxidative stress that results from the response to infection

That's sort of the nature of glutathione - it's very sulfuric, and smells/tastes a bit like rotten eggs
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