Answer:
Vitamin B3, also known as niacin, plays an essential role in the metabolism of carbohydrates, proteins, and fats. It is also important for maintaining healthy skin, nerves, and digestion. Niacin helps to lower cholesterol and triglyceride levels in the blood, which reduces the risk of heart disease. It is also used to treat pellagra, a condition caused by niacin deficiency, which can cause skin rashes, digestive problems, and mental impairment. Additionally, niacin has been shown to have potential benefits for reducing inflammation and improving brain function.