Are vitamins actually useful? The vast majority of people who eat normally don’t need vitamin supplements. It’s all mostly scammy to me: selling people a product that has almost no value unless you are malnourished. It’s big business sure, but it’s on the level of homeopathy for most people. Providing vitamins to undernourished kids might be valuable, but there isn’t any money in that. Vitamins are right up there with “organic” in terms of quantifiable health benefits.