Vitamin B3 or niasin or nicotinic acid is essential for proper circulation, healthy functioning of the nervous system and proper protein and carbohydrate metabolism. It is essential for synthesis of sex hormones, cortisone, thyroxin and insulin. It is contained in liver, fish and poultry, peanut, whole wheat, green leafy vegetables, dates, prunes and tomato.
A deficiency can lead to skin eruptions and frequent stools, mental depression, insomnia, chronic headaches, digestive disorders and anaemia.
The recommended daily allowance is 12 to 20 milligram for adults and 4.8 to 12 milligram for children. Larget doses of this vitamin say upto 100 milligram with each meal, preferably together with other B group vitamins affords relief in case of migraine and high blood pressure cause by nervousness, high cholesterol and arteriosclerosis.