Hello doctors, what does niacin do for your body?

Niacin. It is vitamin b3- very essential for human body. Deficuiency causes pellagra. For more details refer to the following website: http://en.Wikipedia.Org/wiki/niacin.
Niacin. Supplementing with 2000-3000mg of flush free Niacin daily can help to control your cholesterol levels quite nicely, even increasing your HDL and converting your LDL to a less harmful subtype. As a negative, Niacin can cause facial flushing and redness so get the flush free variety. And have your liver enzyme values monitored, as they can be affected by Niacin use.