Glutathione:Is it really effective?

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Everywhere I go,I would always see posters of lovely women with fair complexion. Lotions, soaps, facial cleansers,face powder, and many other beauty products all claim to have whitening effects. Famous local & Hollywood personalities also claimed to have used it in whitening their skin. With the advent of the so-called master of whitening which is Glutathione, everyone became curious about this product.Who doesn't want to have blemished-free,fairer & smoother skin anyway? Skin much like that of a celebrity huh?But how does this "vitamin-supplement" really work? How effective is it in lightening one's complexion?Is there anyone here who could vouch for its efficacy regardless of brand names?