Vitamins are organic substances produced by plants or animals. They often are called "essential" because they are not synthesized in the body (except for vitamin D) and therefore must come from food. Minerals are inorganic elements that originate from rocks, soil, or water.

Where do you get vitamins from?

Try to eat a variety of foods to get different vitamins and minerals. Foods that naturally are nutrient-rich include fruits and vegetables. Lean meats, fish, whole grains, dairy, legumes, nuts, and seeds also are high in nutrients.

How are vitamins produced?

Humans are able to synthesize certain vitamins to some extent. For example, vitamin D is produced when the skin is exposed to sunlight; niacin can be synthesized from the amino acid tryptophan; and vitamin K and biotin are synthesized by bacteria living in the gut.