Herbs of Gold Vitamin B3 500mg 60tIndications Vitamin B3 500mg is a high strength vitamin B3 supplement providing 500mg of nicotinamide. Nicotinamide is converted into the active forms of niacin in the body. Nicotinamide is important for energy production in the body. Nicotinamide is an important component of nicotinamide adenine dinucleotide (NAD), a coenzyme that is essential for energy production. NAD is involved in the breakdown of carbohydrate, proteins and fats to produce energy