Nutrients that Matter to Power You Special K Protein has been purposefully designed with high fibre bran flakes along with ingredients that are natural sources of protein like linseeds and sunflower seeds to help give you strength. High Fibre Feeding your daily fibre needs Vitamin B12 Feeding energy by supporting your nutrient metabolism Iron Feeding endurance by helping to reduce tiredness Vitamin D Feeding defences by supporting your immune system Protein Feeding strength by helping to build and repair muscles and maintain bones A serving of Special K Protein contains ≥15% RI of iron which contributes to the reduction of tiredness and fatigue, vitamin D which contributes to the normal function of the immune system, vitamin B12 which contributes to normal energy-yielding metabolism and is a source of protein which contributes to the growth and maintenance of muscle mass and the maintenance of normal bones.