Vitamin B3 - is one of 8 B vitamins and also known as niacin (nicotinic acid).

Niacin plays a crucial role in energy metabolism in the scalp and hair cells. It facilitate new hair growth as it repairs existing hair damage through the dilation of the blood vessels. In it's niacinamide form, the vitamin works to prevent water loss and retain skin's moisture content. It is also known to increase keratin. 

Other benefits: It may help lower cholesterol, ease arthritis and boost brain function. When it comes to aging skin, niacinamide improves the surface structure, helping smooth out skin's texture and reduce the look of wrinkles.