Vitamin B complex with Vitamin B1, B2, B3, B6 & B12 Supports normal energy-yielding metabolism & contributes to the reduction of tiredness & fatigue Holland & Barrett Complete B Vitamin B Complex provides an excellent source of B vitamins to support normal energy yielding metabolism and the reduction of tiredness and fatigue. Thiamin (B1), Riboflavin (B2), Niacin (B3), and vitamins B6 and B12 also contribute to the normal functioning of the nervous system. Vitamin B complex with Vitamin B1, B2, B3, B6 & B12 Supports normal energy-yielding metabolism & contributes to the reduction of tiredness & fatigue Holland & Barrett Complete B Vitamin B Complex provides an excellent source of B vitamins to support normal energy yielding metabolism and the reduction of tiredness and fatigue. Thiamin (B1), Riboflavin (B2), Niacin (B3), and vitamins B6 and B12 also contribute to the normal functioning of the nervous system.