hello and welcome to HCM forum, i would be glad to answer your query, i would like to inform you that L-glutathione is synthesized by our own body(in liver). it is a very powerful antioxidant and therefore takes care of our skin. but oral supplements should be avoided as they have serious side effects and most of them our eliminated by our body without being absorbed, which makes it useless. therefore, eat fresh fruits, vegetables, meat and dairy products which will enhance production of glutathione in your body itself. do not go by what websites say,instead meet a dermatologist who will tell you about other options available for skin whitening. i hope i answered you query, i wish you good health.