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  • Vitamin | Definition, Types, Facts | Britannica
    Vitamin, any of several organic substances that are necessary in small quantities for normal health and growth in higher forms of animal life Vitamins generally cannot be synthesized in amounts sufficient to meet bodily needs and therefore must be obtained from the diet or from some synthetic source
  • Vitamin Definition Meaning | Britannica Dictionary
    vitamin ˈ vaɪtəmən Brit ˈ vɪtəmən noun plural vitamins Britannica Dictionary definition of VITAMIN [count] 1 : a natural substance that is usually found in foods and that helps your body to be healthy
  • Nutrition - Vitamins, Minerals, Macronutrients | Britannica
    Nutrition - Vitamins, Minerals, Macronutrients: Vitamins may be defined as organic substances that play a required catalytic role within the cell (usually as components of coenzymes or other groups associated with enzymes) and must be obtained in small amounts through the diet Vitamin requirements are specific for each organism, and their deficiency may cause disease Vitamin deficiencies in
  • Vitamin C | Definition, Structure, Benefits, Facts | Britannica
    Vitamin C, water-soluble, carbohydrate-like substance that is involved in certain metabolic processes of animals Although most animals can synthesize vitamin C, it is necessary in the diet of some, including humans and other primates, in order to prevent scurvy
  • Scurvy | Definition, History, Treatment | Britannica
    Scurvy, nutritional disorder in humans caused by a deficiency of vitamin C
  • Vitamin D | Biosynthesis, Benefits, Recommended Daily Intake - Britannica
    Vitamin D, any of a group of fat-soluble vitamins that plays a role in calcium metabolism in animals The primary source of vitamin D is sunlight exposure, whereby ultraviolet radiation converts sterols present in the skin to vitamin D Learn more about vitamin D synthesis, actions, and deficiency
  • Vitamin B12 | Sources, Deficiency Health Effects | Britannica
    Vitamin B12, a complex water-soluble organic compound that is essential to a number of microorganisms and animals, including humans Vitamin B12 aids in the development of red blood cells in higher animals The vitamin, which is unique in that it contains a metallic ion, cobalt, has a complex
  • Vitamin A | Sources, Deficiency Health Effects | Britannica
    Vitamin A deficiency Deficiency of vitamin A results in various disorders that most commonly involve the eye and the epithelial tissues In humans, one of the earliest signs of vitamin A deficiency is night blindness (nyctalopia), the visual failure to adapt promptly from light to darkness and to see in the dark
  • Large intestine | Definition, Location, Anatomy, Length, Function . . .
    Large intestine, posterior section of the intestine, consisting typically of four regions: the cecum, colon, rectum, and anus The term colon is sometimes used to refer to the entire large intestine The large intestine is wider and shorter than the small intestine and has a smooth inner wall
  • Dietary supplement | Definition, Types, Regulation, Safety | Britannica
    Dietary supplement, any vitamin, mineral, herbal product, or other ingestible preparation added to the diet to benefit health Dietary supplements represent a broad category of products that are distinguishable from conventional foods and drugs Learn more about the regulation and safety of dietary supplements





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