Niacin, Nicotinic acid equiv formerly known as (B3) 

EU RDA (1) Per Day
European Union Recommended Daily Amounts for Nutritional Labelling of Food Products.
18 mg

Best Sources
Meat, poultry, fish, fortified cereals, peanuts, potatoes, dairy products, eggs.

Functions
Involved in carbohydrate, protein and fat metabolism.

Deficency Symptons
Skin disorders, diarrhoea, indigestion, general fatigue.

Toxic? (4)
Nicotinic acid form should be taken only under doctor's care.

Tips
Roast or grill beef, veal, lamb and poultry. Cook potatoes in minimal water.

Did you know?
Niacin is formed in the body by converting an amino acid found in proteins.

Definitions
EU RDA - European Union Recommended Daily Amounts. These are the values used for vitamins for the nutritional labelling of food products.

Sources
EU RDA - Directive, 90/496/EEC, 1990.
Also information from the U.S. Food and Drug Administration, the American Institute for Cancer Research, and the U.S. Department of Agriculture.

(1) EU RDA - European Union Recommended Daily Amounts for Nutritional Labelling of Food Products.

(2) Safe intake per day.

(3) There is no EU RDA for vitamin K.

(4) Note that some vitamins in large or very large excess could produce toxic symptoms. Always keep to the recommended dosage as advised by your doctor or medical advisor.

Source:
The European Food Information Council