A vitamin is a chemical compound that is needed in small amounts for the human body to work correctly. They include Vitamin A, many B vitamins (like B 1, B 2, B 3, B 6, and B 12), Vitamin C, Vitamin D, Vitamin E, and Vitamin K.For example, citrus fruits such as oranges and lemons contain vitamin C. The term was coined in 1912 by biochemist Casimir Funk, who isolated a complex of micronutrients ... More @Wikipedia
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