Energy Magnesium contributes to a reduction of tiredness and fatigue. Muscle Vitamin D contributes to the maintenance of normal muscle function. Heart EPA & DHA contribute to the normal function of the heart. Brain DHA contributes to normal brain function. Bones Calcium is needed for the maintenance of normal bones, Vision Vitamin B2 contributes to maintenance of normal vision. Metabolism Vitamins B6 & B12 contribute to normal energy yielding metabolism.