3-Pyridinecarboxylic Acid, also known as nicotinic acid or niacin, is an organic compound with the formula C6H5NO2. It features a pyridine ring with a carboxylic acid group attached at the third position. This compound is a colorless, crystalline solid that is soluble in water and has a slightly acidic nature. This acid is important in biochemistry as it serves as a precursor to NAD and NADP, which are essential coenzymes in cellular metabolism. 3-Pyridinecarboxylic Acid is also used in dietary supplements and can be found in various foods, contributing to overall health and wellness.