10. Multivitamins
Research on multivitamins has delivered mixed results, and there’s really no strong evidence that a daily multivitamin reduces the risk of things like diabetes, cancer, or heart disease. However, if your diet is all over the place or you are too busy to pay much attention to what or when you eat, a multivitamin can be good to smooth out any deficits.
If you go this route, choose a vitamin that doesn’t provide too much of anything, unless the excess can be easily excreted in urine (vitamin C, for example). And steer clear of extra individual supplements except as recommended by your doctor. Daily multivitamins are theoretically designed to be nutritionally complete.