Vitamins & Dietary Supplements are substances used to add nutrients to your diet or to lower your risk of health problems. Vitamins & Dietary Supplements come in the form of pills, capsules, powders, gel tabs, extracts, or liquids. They might contain vitamins, minerals, fiber, amino acids, herbs or other plants, or enzymes. Sometimes, the ingredients in dietary supplements are added to foods, including drinks. A doctor’s prescription is not needed to buy dietary supplements.