This is a high strength supplement that provides a level of niacin that has been used in scientific studies. Each tablet provides a full 250mg of Vitamin B3 and is made in the UK to pharmaceutical standards.Niacin is the general term for vitamin B3, as it can occur in several forms including nicotinic acid, niacinamide, and nicotinamide, the latter of which we think is the best form to use in supplements. Niacin contributes to the normal function of the nervous system, as well as to the maintenance of normal skin and mucous membranes. Like many of the B vitamins it is also involved in the metabolic processes that release energy from food, and it contributes to the reduction of tiredness and fatigue.Daily intake: 1 to 2 tablets