|MadSci Network: Biochemistry|
Niacin - either nicotinic acid or nicotinamide (shown
here) - is designated as Vitamin PP ("PP" stands for
"Pelagra-Preventing"). Because of its inclusion in the B-complex group of
vitamins, I have also seen it referred to as vitamin B3; however, this
name is not recognized by IUPAC or any scientific organization I could find -
they all refer to it as vitamin PP. Niacin is used by cells to make the
dinucleotide coenzymes NAD+
(Nicotinamide Adenosine Dinucleotide) and NADP+
(NAD-Phosphate), which are important
for energy transfer and storage. The numbered B-complex vitamins are thiamine
(vitamin B1), riboflavin (vitamin B2), pyridoxine (vitamin
B6), and cobalamin (vitamin B12). The B-complex also
includes biotin, folic acid, and pantothenic acid.
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