Introduction. 1  If you were a single-celled organism and you lived in a nutrient-rich place, staying alive would be pretty straightforward. 2  However, odds are you are not an amoebaâgiven that you're using Khan Academy right nowâand things arenât quite so simple for big, many-celled organisms like human beings.
The daily niacin requirement varies with the number of calories burned daily (the energy expenditure) and the protein intake. One niacin equivalent equals 1 mg of preformed niacin or 60 mg of dietary tryptophan. Niacin can be synthesized in the body from the essential amino acid tryptophan.Tissues can form an average of I mg of niacin from 60 mg of tryptophan provided by dietary protein. Consequently a high-quality protein diet supplies substantial tryptophan for niacin synthesis.he daily niacin requirement varies with the number of calories burned daily (the energy expenditure) and the protein intake. One niacin equivalent equals 1 mg of preformed niacin or 60 mg of dietary tryptophan. Niacin can be synthesized in the body from the essential amino acid tryptophan.
Niacin. NIacin is sometimes called nicotinic acid or vitamin B-3. When you eat foods containing niacin, your body uses it to produce two compounds, NAD and NADP, which are coenzymes.Coenzymes activate enzymes your body needs to fuel many biochemical reactions and are often made from vitamins.NAD and NADP fuel more than 200 reactions, notes the Linus Pauling Institute.iacin. NIacin is sometimes called nicotinic acid or vitamin B-3. When you eat foods containing niacin, your body uses it to produce two compounds, NAD and NADP, which are coenzymes.