my how the ignorant can blather on! Talk about Snurf brain! lol! The useless totally inaffective dosages you are talking about are as useful as a fart in the wind! These rda levels are designed to fail! The horror stories made and spread by the ignorant keep people from ever feeling or knowing the benefits of vitamin c the above advice should be ignored and actually laughed at ! People who come in here with establishment info need to be pointed out, they are as bad as a big pharma advertisment. Ignorance breeds ignorance!