Glutathione is very famous a decade ago and even until now. From the soap,lotion,capsule to injection. Many people used it. Although I'm not able to used it because of its expensive price, I able to saw how best its effect to my best friend who used it thru injection. Her skin became more fairer and glossy. She looks younger than her age and many people surround us caught her looks. The effect is noticeable after her three months of used. But the problem with the glutathione is when she stop it, her skins returned to the old one and worst she looks matured. I think if you just maintaining glutathione, it it good. But again, it needs to see a doctor prior to using it. As far as what I read to some article, to whiten is just the side effect of glutathione.