Vitamins are organic molecules (or a set of closely related molecules called vitamers) that are essential to an organism in small quantities for proper metabolic function. These essential …

Jan 2, 2026 · What are the vitamin requirements in human beings? There is no uniform agreement concerning vitamin requirements for humans, but recommended daily vitamin …

Get all the information you need on vitamins and supplements, from A to Z, with WebMD's comprehensive database. Our expert resources cover everything from health benefits to …

Jan 21, 2025 · There are 13 essential vitamins. This means that these vitamins are required for the body to work properly. They are: Vitamins are grouped into two categories: Fat-soluble …

Vitamins are organic substances that are generally classified as either fat soluble or water soluble. Fat-soluble vitamins (vitamin A, vitamin D, vitamin E, and vitamin K) dissolve in fat and tend to …

Oct 5, 2023 · This article explains what vitamins are, what they do, and which foods are good sources. Follow the links in blue below for more information about each vitamin.

Very few foods naturally have vitamin D. Fatty fish such as salmon, tuna, and mackerel are among the best sources. Fortified foods like milk provide most of the vitamin D in American diets.

Sep 4, 2025 · Vitamins are essential nutrients that help with many body functions, including metabolism and energy. There are two types of vitamins: fat-soluble and water-soluble, each …

Learn about the functions that each vitamin and mineral performs in the body. Discover what minerals your body needs to stay healthy and work properly. Learn what vitamins your body …

Aug 22, 2023 · Learn about the 13 essential vitamins your body needs for proper function, their roles, and how to get them through a balanced diet. Plus, the risks of vitamin deficiencies and …