Product description Vitamin D3 Active form: cholecalciferol 4000 IU Muscle and bone health Strengthening the immune system Uni -Pharma D3 Fix 4000 IU is a dietary supplement containing vitamin D3 in the form of cholecalciferol, which is the active form of vitamin D. Vitamin D3 is produced by the action of ultraviolet radiation on the skin. Although any organism can produce vitamin D3, the modern lifestyle, malnutrition and insufficient exposure to sunlight, results in vitamin D3 deficiency, which must be obtained through food, as the role in keeping the body in good condition is important. It is also known to contribute to the normal absorption / utilization of calcium and phosphorus, to normal levels of calcium in the blood, to the maintenance of normal bones, to the maintenance of normal muscle function, to the maintenance of normal teeth, to the normal functioning of the immune system and has a role in the process of cell division. * Vitamin D also helps reduce the risk of falls associated with body instability and muscle weakness. Falls are a risk factor for bone fractures in men and women aged 60 and over.