Tip - Vitamins and Minerals: How Much Do You Need?

How much of a vitamin or mineral supplement should you take? Are your daily multivitamins enough? WebMD tells you what you need to know about RDA, daily value, and upper limits of vitamins and supplements.
Tags: vitamins, dietary supplements, supplements, vitamins and minerals, daily vitamins, vitamin deficiency, RDA, vitamin D, vitamin B6, vitamin A, iron, selenium