Vitamin B3

Vitamin B3

Niacin contributes to the function of the nervous system, reduction of tiredness and fatigue, normal energy-yielding metabolism, normal psychological function, and the maintenance of normal skin and mucous membranes.

Good food sources include meat, fish, wheat flour, potato and eggs.

Daily requirements are 16.5mg for men and 13.2mg for women.

​Deficiency can lead to loss of appetite, headache, nausea, fatigue, mouth ulcers, dry skin, difficulty sleeping, poor memory and irritability. Severe cases can lead to dementia.


  • Prolonged use of oral contraceptives can lead to Niacin deficiency
  • Large doses should be avoided in gout as it can lead to raised uric acid levels