Do I need a multivitamin or am I buying expensive urine?

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Can St John's wort interfere with birth control pills? Creatine is the one sports supplement with real evidence — what dose and when? Where do vegans get B12 if they refuse to take a supplement? How much tuna is too much when it comes to mercury? Iron tablets made me constipated — what else can raise low ferritin? Is there real evidence that turmeric or ginger reduces inflammation? Does vitamin D do anything for people who already get plenty of sun? Greens powders: can a scoop replace vegetables? Do collagen powders reach your skin or get digested like any other protein? Which foods should someone on warfarin keep steady rather than avoid?