Vitamins are an important part of a healthy diet. They're essential for helping your body function properly and maintaining good health, so it's always a good idea to make sure you're getting the proper amount. However, with all the choices out there and all the conflicting information about what vitamins do and don't do for your body, it can be hard to know where to start. To get you going on the right foot, here are 5 things you should know before you start taking vitamins.