Magnesium: contributes to a reduction of tiredness & fatigue, electrolyte balance, as well as normal muscle function. Vitamin B6: supports normal protein & glycogen metabolism & the normal function of the immune system. Riboflavin: plays a role in the normal metabolism of iron & protection of cells from oxidative stress. Zinc: contributes to normal carbohydrate metabolism. Thiamine: supports normal functioning of the heart & energy-yielding metabolism.