So, what's the difference between japan glutathione & those USA made? I have tried GNC before but I was way too underdose( 6 tabs of their 50mg making it 300mg). Although I noticed nicer skin, it never made me whiter. :mad: Right now, I combined 2 glutathione pills to get to 3000mg glutathione/day & I think I have whitened more than a shade in my 15days(I forgot to take them for 2 days so that makes it 13days) with the high dose. How come these Japan made glutathione have become very popular these days?