One Science ZMA is an essential mineral/vitamin combination providing Zinc, Magnesium and Vitamin B6. Zinc and Magnesium contribute to normal protein synthesis, to the maintenance of normal bones and have a role in the process of cell division. Zinc and Vitamin B6 contribute to the normal function of the immune system. Magnesium and Vitamin B6 contribute to a reduction of tiredness and fatigue, to normal energy-yielding metabolism and to normal psychological function. Zinc contributes to normal DNA synthesis and acid-base metabolism, to normal carbohydrate and macronutrient metabolism, to normal cognitive function, to normal fertility and reproduction, to the normal metabolism of fatty acids, to the maintenance of normal hair, nails, skin and vision, to the maintenance of normal testosterone levels in the blood and to the protection of cells from oxidative stress.* Magnesium contributes to electrolyte balance, to the normal functioning of the nervous system: neurotransmission and muscle contraction including heart muscle and to the maintenance of normal teeth.* Vitamin B6 contributes to normal red blood cell formation and to the regulation of hormonal activity.