Makes me wonder if there are other vitamins that we need but we don't know about yet that could account for some sickness. They pretty much don't research that stuff anymore, there's no profit in it. Then you look at things like most salt in the USA no longer having iodine added, etc so even the known vitamins are probably lacking in a lot of peeps. But you read that 'if you eat a healthy diet' you won't have probs. THat's bs, you can eat all healthy foods and still be missing certain vitamins, a lot depends on which foods you choose and how they are produced. Then they tell you to not go in the sun without sun screen but almost no docs tell you to take vit D to make up for it. Milk has vit D added but they tell you to drink nonfat milk, well vit D requires fat to be absorbed, many peeps do not realize you need to take your D vitamins with fat or it's useless. You almost have to be a scientist and dedicate months of research just to eat healthy because they make it hard to figure out and they give you bad advice.