Have you proven the effectivity of Glutahione or Metathione to Whiten skin

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Have you tried using this much talked about Glutathione or Metathione. I don't know if I have even spelled them correctly. You see personnally, I also want to try because I also want to get whiter skin tone. But I don't want my hard-earned money to get wasted because this whitening pills are not cheap. Has anyone tried this please give me feedback. Thansk