Niacin is also known as nicotinic acid and is part of the vitamin B complex group.  It is vital for the circulation of the blood and proper performance of the nervous system.  It helps metabolize proteins and carbohydrates.  Vitamin B3 is necessary for the diffusion of sex hormones, cartisone, thyroxin and insulin.

A diet lacking in vitamin B3 can cause a variety of complications such as: Depression, insomnia, headaches, skin eruptions, anemia, digestive disorders, and more.  This diet can also provide relief from migraines and high blood pressure, attributable to HCL, arteriosclerosis or nervousness.
Foods that contain niacin include: green leafy vegetables, whole wheat, you should, liver, poultry, peanuts, dates, figs, prunes, and tomatoes.

It is best and recommended to take vitamin B3, in combination with other be group vitamins.

The recommended daily allowance of niacin for adults is 12 to 20 mg.
The recommended daily allowance of niacin for children is 4.8 to 12 mg.