Multivitamins are a combination of many different vitamins that are normally found in foods and other natural sources.
Multivitamins are used to provide vitamins that are not taken in through the diet. Multivitamins are also used to treat vitamin deficiencies (lack of vitamins) caused by illness, pregnancy, poor nutrition, digestive disorders, and many other conditions.
Cosmeceuticals are cosmetic products with bioactive ingredients purported to have medical benefits. The name is a combination of "cosmetics" and "pharmaceuticals". "Nutricosmetics" are related dietary supplement or food or beverage products with additives that are marketed as having special benefits that affect appearance.
A dietary supplement is a manufactured product intended to supplement the diet when taken by mouth as a pill, capsule, tablet, or liquid. A supplement can provide nutrients either extracted from food sources or synthetic, individually or in combination, in order to increase the quantity of their consumption. The class of nutrient compounds includes vitamins, minerals, fiber, fatty acids and amino acids. Dietary supplements can also contain substances that are having beneficial biological effect, such as plant pigments or polyphenols.