• contributes to normal cysteine synthesis • contributes to a normal energy-yielding metabolism • contributes to the normal functioning of the nervous system • contributes to normal homocysteine metabolism • contributes to normal protein and glycogen metabolism • contributes to normal mental function • contributes to the normal formation of red blood cells • contributes to the normal functioning of the immune system • contributes to the reduction of tiredness and fatigue • contributes to the regulation of hormonal activity