Vitamin and Derivatives：Vitamins are a group of organic materials necessary to living activities in humans, and they are the important substance to maintain health of human body. Vitamins have critical influence in growth, metabolism and development of human body. When the body can not synthesize vitamins or enough vitamins, the demands of the body can not satisfied, and then vitamins must be imported from external environment. Vitamins are generally classified into two major categories, water soluble and fat soluble.
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