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This is an excellent visualisation on vitamins and supplements and the proof behind claims. Has been around for about 10 years but he keeps it updated.
There is an article in this months Which magazine about supplements. They have a list of vitamins that are proven to work and ones that aren't proven by medical studies to work.
Was suprised to see that there is no evidence that eating glucosamine supplements leads to more glucosamine being made available to joints. Loads of people swear by it but there is vanishingly little evidence to support efficacy.
Edit: There was also a fairly sobering warning about taking too much Vitamin D. Aparently more than 100ug per day over a period if time can weaken bones and damage your heart and kidneys.