Nutrients That Matter To Power You Fibre Feeding your daily fibre needs Vitamin B6 Feeding recovery by helping to reduce fatigue Vitamin B12 Feeding energy by supporting your nutrient metabolism Vitamin D Feeding defences by supporting your immune system Iron Feeding endurance by helping to reduce tiredness A serving of Special K cereals contains ≥15% RI of iron and vitamin B6 which contribute to the reduction of tiredness and fatigue, vitamin D which contributes to the normal function of the immune system and vitamin B12 which contributes to normal energy-yielding metabolism.