Emily is thinking about taking a dietary supplement. She knows she should try to get her vitamins and minerals from the food she eats, but she doesn’t always have the chance to eat right. And with more than 50,000 dietary supplements on the market, like a lot of other people, Emily has questions. Like: How much vitamin A is good for you — and how much is too much? If something’s natural, doesn’t it mean it’s safe? Can folic acid prevent birth defects? Should we be taking calcium and vitamin D supplements? Luckily, there’s a place everyone can go for answers. It’s the website of the Office of Dietary Supplements. We’re part of the National Institutes of Health, and since 1995 we’ve been conducting, funding, and evaluating research that we use to educate the public. Giving Emily plenty of information she can share and discuss with her health care providers. We’re ODS. For what you need to know about dietary supplements.