Which vitamin can be made from the amino acid tryptophan?
a. riboflavin
b. niacin
c. thiamin
d. pantothenic acid

The correct answer is Niacin.

Niacin is one of the eight vitamins that make the B complex. It is also known as as nicotinic acid and vitamin B-3. It is a water soluble vitamin which the body cannot store. Niacin can be found in common foods, beets, fish, yeast based food. Niacin can be synthesized from the amino acid Tryptophan.

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