what is the pro vitamin/precursor of vitamin niacin
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Answer:Biosynthesis. The liver can synthesize niacin from the essential amino acid tryptophan, requiring 60 mg of tryptophan to make one mg of niacin. Riboflavin, vitamin B6 and iron are required in some of the reactions involved in the conversion of tryptophan to NAD.A provitamin is a substance that may be converted within the body to a vitamin. The term previtamin is a synonym. ... The term "provitamin" is used when it is desirable to label a substance with little or no vitamin activity, but which can be converted to an active form by normal metabolic processes.
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