I'm not talking about vitamins in general; I'm talking about vitamin D and how embarrassingly low the U.S. RDA is. There are a great many Americans who would s

I'm not talking about vitamins in general; I'm talking about vitamin D and how embarrassingly low the U.S. RDA is. There are a great many Americans who would see immense benefit by taking (say) 1,000 to 2,000 IU of vitamin D per day. And I feel pretty confident there are no people for whom an extra 2,000 IU would be negative.