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Niacin deficiency is a consequence of a diet low in both niacin and the amino acid tryptophan, a precursor for the vitamin. Low plasma tryptophan is a non-specific indicator, meaning it can have other causes. The signs and symptoms of niacin deficiency start to revert within days of oral supplementation with large amounts of the vitamin. [23] [24]
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Niacin has been linked to a higher risk of heart disease. It is often added to flour and fortified cereals in the U.S. The B vitamin used to be a popular medication to lower high cholesterol.
Carcinoid syndrome thus may produce niacin deficiency and clinical manifestations of pellagra. Anti-tuberculosis medication tends to bind to vitamin B 6 and reduce niacin synthesis, since B 6 (pyridoxine) is a required cofactor in the tryptophan-to-niacin reaction. Several therapeutic drugs can provoke pellagra.
Example of a label showing the amount of niacin (Vitamin B3), and specifying to be niacinamide in the ingredient section.. The United Stated adopted in 1942 the terms niacin to nicotinic acid and niacinamide to nicotinamide to avoid references to nicotine, [12] [13] the terms were incorporated into the United States Adopted Name [14] that was created later in 1961.
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Pellagra was the first disease to be associated with NAD+ deficiency. [12] It was linked to nutritional deficiency by Joseph Goldberger in 1914, and to deficiency of niacin (vitamin B 3) by Conrad Elvehjem in 1937. NAD+ (then called coenzyme I) was shown to be extremely low in cases of pellagra, and NA and NAM were identified as molecular ...
Hartnup disease (also known as "pellagra-like dermatosis" [1] and "Hartnup disorder" [2]) is an autosomal recessive [3] metabolic disorder affecting the absorption of nonpolar amino acids (particularly tryptophan that can be, in turn, converted into serotonin, melatonin, and niacin).