In today's class, you talked about how people take vitamins in order to build their immune system, why do you think people who are healthy are misinformed about thinking they have to take a daily vitamin?
Because vitamin manufacturers have really good advertising agents! The American public has been convinced by ads that everyone has to take vitamins, when, in reality, if you have an adequate diet, you don't need them. There is a great book with a fascinating chapter about this called Pandora's Lab, by Paul Offit.