GLUTATHIONE: Is this just good enough for skin whitening?

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Hey healthy-conscious mylotters, have you heard about this Glutathione? Some said it is good for our liver, but what I heard usually heard and see on TV ads, it is good for skin whitening. In fact some known personalities endorsed Glutathione. There are how many really kinds of Glatathione? What's really Glutathione is? Your reply is highly appreciated...Thanks..