Main health benefits of vitamin D: It helps to maintain normal levels of calcium in the blood. Helps to achieve and maintain normal bones and teeth. It is involved in the maintenance of normal muscle function. Reduces the risk of falling. Falls are a risk factor for bone fractures, especially in men and women 60 years of age and older. It contributes to the normal functioning of the immune system and to an inflammatory response to the bone. Participates in the control of cell division and specialization in the body. Vitamin D deficiency has been associated with an increased risk of Alzheimer's in older people.