If I may make a suggestion, go to Google Scholar & check the research (NOT ad copy from websites selling the pills) them. There isn't a single scientific study from anywhere in the world supporting the claims that these companies are making. there has never been a study able to confirm that an oral or injectable substance or compound will cause melanin production to significantly & visibly lessen. Furthermore, the long-term effects of these high glutathione pills are unknown. The body uses only so much glutathione. Like with some vitamins, mega-dosing is useless: the body merely excretes the surplus. It is only absorbed in certain forms too. As with some vitamins, the body doesn't absorb them in pill or tablet form at all! Please think twice before ingesting stuff. The lightening you think you're seeing is likely due to avoiding the sun & using sunblock. there are scientifically verified (double blind studies) compounds that have been consistantly proven to lighten significantly, effectively, steadily & safely when used correctly. Why experiment with dodgy pills? Think about it: these pills are one of the biggest selling products in the Philippines. If they DID work, there wouldn't be a tan or a brown person left standing! The same is true in Thailand. If these pills worked, no one would be manufacturing or selling creams at all: like manual typewriters or dial telephones, they'd have become obsolete.
Please do not be swayed by the testimonials or the ad copy. The claims they make are vague & even contradictory if you read them carefully.