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  2. Vitamin | Definition, Types, & Facts | Britannica

    www.britannica.com/science/vitamin

    vitamin, any of several organic substances that are necessary in small quantities for normal health and growth in higher forms of animal life. Vitamins are distinct in several ways from other biologically important compounds such as protein s, carbohydrate s, and lipid s.

  3. What Are Vitamins? - Healthline

    www.healthline.com/health/nutrition/what-are-vitamins

    Vitamins are nutrients that are found in the foods we eat. They’re needed for functions such as growth, metabolism, and nervous system activities. Often, a health-promoting diet...

  4. Vitamins and Minerals – The ... - The Nutrition Source

    nutritionsource.hsph.harvard.edu/vitamins

    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 accumulate in the body.

  5. Vitamin - Wikipedia

    en.m.wikipedia.org/wiki/Vitamin

    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. Essential nutrients cannot be synthesized in the organism in sufficient quantities for survival, and therefore must be obtained through the diet.

  6. Vitamin Definition & Meaning - Merriam-Webster

    www.merriam-webster.com/dictionary/vitamin

    The meaning of VITAMIN is any of various organic substances that are essential in minute quantities to the nutrition of most animals and some plants, act especially as coenzymes and precursors of coenzymes in the regulation of metabolic processes but do not provide energy or serve as building units, and are present in natural foodstuffs or ...

  7. What are vitamins, and how do they work? - Medical News Today

    www.medicalnewstoday.com/articles/195878

    Vitamins are organic substances present in minute amounts in natural foodstuffs. Having too little of any particular vitamin may increase the risk of developing certain health...

  8. Definitions of Health Terms: Vitamins - MedlinePlus

    medlineplus.gov/definitions/vitaminsdefinitions.html

    Vitamins are substances that our bodies need to develop and function normally. They include vitamins A, C, D, E, and K, choline, and the B vitamins (thiamin, riboflavin, niacin, pantothenic acid, biotin, vitamin B6, vitamin B12, and folate/folic acid).

  9. Vitamins: MedlinePlus Medical Encyclopedia

    medlineplus.gov/ency/article/002399.htm

    Vitamins are a group of substances that are needed for normal cell function, growth, and development. There are 13 essential vitamins. This means that these vitamins are required for the body to work properly. They are: Vitamin A; Vitamin C; Vitamin D; Vitamin E; Vitamin K; Vitamin B1 ; Vitamin B2 ; Vitamin B3 ; Vitamin B6 (pyridoxine)

  10. VITAMIN | English meaning - Cambridge Dictionary

    dictionary.cambridge.org/dictionary/english/vitamin

    VITAMIN definition: 1. any of a group of natural substances that are necessary in small amounts for the growth and good…. Learn more.

  11. VITAMIN | definition in the Cambridge English Dictionary

    dictionary.cambridge.org/us/dictionary/english/vitamin

    VITAMIN meaning: 1. any of a group of natural substances that are necessary in small amounts for the growth and good…. Learn more.