Nicotinic acid is an important compound that is used in various industrial and medical applications. This compound is also known by different names, including niacin, vitamin B3, and nicotinamide. Niacin is the most common name used for nicotinic acid in the food and vitamin industry. Nicotinamide is a derivative of nicotinic acid that is used in cosmetic products. Vitamin B3 is the commonly used name for nicotinic acid in pharmacology. Besides these names, nicotinic acid is also known by other synonyms such as nicotinoyl chloride, isonicotinic acid, and 3-pyridinecarboxylic acid. All these different names reflect the varied uses of nicotinic acid in various fields.