Zinc contributes to the normal fatty acids and carbohydrate metabolism, protection of cells from oxidative stress and it supports a healthy immune system. Vitamins B6, B12 and Iron help reduce tiredness and fatigue, improve energy levels, the formation of red blood cells. Iron is essential element for oxygen transport and energy production. Magnesium supplements contribute to a reduction of tiredness and fatigue, normal energy-yielding metabolism. It also supports a healthy electrolyte balance and normal muscle function (incl the heart). Magnesium and zinc supplements contributes to normal muscle function (incl heart) normal fatty acids and carbohydrate metabolism Magnesium and zinc help tmaintain a healthy heart rhythm. Potassium supplements supports normal blood pressure Potassium helps the body regulate fluids, nerve signals and muscle contractions, and ensures the heart muscle / rhythm works properly.