Multi A-Z is a complete formula with vitamins B, C, D, E, A, K and minerals such as calcium, magnesium, phosphorus, zinc, selenium, and high iron content (14mg). Iron and B vitamins contribute to energy production, reduction of fatigue, and proper functioning of the nervous system, including concentration. Vitamins C, D, A, E, zinc, and selenium boost the immune system and protect cells from oxidative damage caused by toxins and the environment. Calcium, magnesium, phosphorus, and vitamins D and K contribute to maintaining good bone health.