I find this interactive chart helpful: http://www.informationisbeautiful.net/play/snake-oil-supplements/ http://www.informationisbeautiful.net/play/snake-oil-s

I find this interactive chart helpful: http://www.informationisbeautiful.net/play/snake-oil-supplements/ http://www.informationisbeautiful.net/play/snake-oil-supplem... Particularly, it breaks each supplement down by effect, for example, it lists Antioxidants far negative for 'mortality' (per the article), but positively for 'infertility in men'. It also cites sources. Perhaps, judging by the article, they should have a 'harmful' ranking as well. By this chart, Vitamin D makes sense for 'general health' (I have gotten it recommended for immune system issues like allergies), and Omega 3 for 'heart disease' seem like winners. I didn't see Iodine on there. The question of 'what supplement' seems incomplete without 'for what purpose'.