By inhibiting the production of melanin, glutathione can help reduce the appearance of dark spots, hyperpigmentation, and uneven skin tone
Qi X, Zheng L, Lee K, Kim D, Kim C, Cai D, et al
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A.MitchellL
The problem, though, is that it's very unstable, turns brown and becomes ineffective in no time (after a few month) and the cosmetics industry is trying to come up with smart derivatives that are stable and have the magic properties of pure Vitamin C