So, worth noting is that we might as well attack the question from a theoretical angle as well as an empirical one, when we are choosing to disregard so many st

So, worth noting is that we might as well attack the question from a theoretical angle as well as an empirical one, when we are choosing to disregard so many studies due to confounders and the like. It turns out that a surprising number of people in developed countries nonetheless suffer vitamin deficiencies: Vitamin D deficiency at 41% of population: http://www.ncbi.nlm.nih.gov/pubmed/21310306 http://www.ncbi.nlm.nih.gov/pubmed/21310306 Other deficiencies: http://www.cdc.gov/media/releases/2012/p0402_vitamins_nutrients.html http://www.cdc.gov/media/releases/2012/p0402_vitamins_nutrie... It is commonly stated that vitamin supplements do not do anything for people who do not have vitamin deficiencies. But even in rich Western countries, a significant proportion of people do have vitamin deficiencies! So the supplements are not always misguided. Worth noting that potassium is never included in vitamin supplements due to technical limitations (high concentrations of potassium are cytotoxic). Eat your vegetables! Also worth noting is I'm drunk so this post contains errors...