Hello!! Glutathione definitely helps to get fairer as it stop production of eumelanin. It can make you fairer to 2-3 shades and not more. Also the effect will last for only 1-2 yrs and maintanence dose is required after that.
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Also sun protection is required even after taking glutathione to prevent further tanning or to avoid re appearance of tan.
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It is not an US FDA approved treatment for fairness.