What is the difference in niacin and niacinamide?

Niacin, also known as vitamin B3 or nicotinic acid, is a water-soluble vitamin that plays a crucial role in energy metabolism and the functioning of the nervous system. Niacinamide, or nicotinamide, is the amide form of niacin and is often used in skincare products due to its anti-inflammatory and skin-repairing properties. While both compounds can be converted into each other in the body, niacin can cause flushing and other side effects at high doses, while niacinamide is generally well-tolerated without such effects.