Supplements. Vitamins, minerals, herbs, or other substances taken orally and meant to correct deficiencies in the diet.
U.S. Pharmacopeia (USP). A nonprofit authority that sets standards and certifies supplements that meet certain quality, strength, and purity standards, some of which are called the Good Manufacturing Practices (GMP). Many supplements carry the USP symbol on their label.
Vitamins. Naturally found in plants and animals, vitamins are vital to growth, energy, and nerve function. There are two types of vitamins used by the body to support health: fat-soluble and water-soluble.
Water-Soluble. Water-soluble vitamins like B-6, C, and folic acid are easily absorbed by the body. Your body uses the vitamins it needs, then excretes excess water-soluble vitamins in urine. Because these vitamins are not stored in the body, there is less risk of toxicity than with fat-soluble vitamins, but a greater risk of deficiency.