A deficiency of it in the body results in maculopathy, and it is known to promote HDL increases in the blood.  
It is synthesized by cleaving the aromatic heterocycle of tryptophan, which rearranges the alpha amino group, and forms the intermediate known as kynurenine.  A deficiency of it in the body results in maculopathy, and it is known to promote HDL increases in the blood.  However, it is better known for its derivatives, which include NAD, NADH, and NADP.  First discovered in nicotine, it is also known as nicotinic acid, and a deficiency in it can cause pellagra.  FTP, identify this water-soluble vitamin otherwise known as B3.
It is synthesized by cleaving the aromatic heterocycle of tryptophan, which rearranges the alpha amino group, and forms the intermediate known as kynurenine.  
niacin (accept early nicotinic acid or vitamin B3)