Nicotinic acids

Nicotinic acid (3-pyridinecarboxylic acid) and its amide, nicotinamide, are the common forms of the B-vitamin niacin (vitamin B₃). Outside the field of nutrition, the term "nicotinic" is sometimes used to refer to a broader family of compounds that have as their core nicotinic acid or one of its positional isomers, 2- or 4-pyridinecarboxylic acid (picolinic acid and isonicotinic acid, respectively).