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 is one of the B vitamins, sometimes also called vitamin B-3 or nicotinic acid. Because it is a water-soluble vitamin, your body is unable to store niacin.Rather, you must obtain it regularly from food in your diet.Niacin helps keep your skin, hair and eyes healthy and also supports the function of your nervous and digestive systems.our body converts niacin into a compound called nicotinamide, which is then modified to form two compounds, called NAD and NADP. Your cells and tissues use more than 200 enzymes to convert nutrients into energy, and most of these enzymes require NAD or NADP to function.