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 synthesized from the amino acid tryptophan. If you suffer from Hartnup (unable to use the tryptophan in the body so it is excreted in the urine), you can given niacin. mon: the purpose of tryptophan is to make niacin. if you lack tryptophan we can skip the middle man and just treat you with niacin. Biological function of Niacin (B3)