Vitamin D3, also called cholecalciferol, essential for the formation and maintenance of bones, muscles and nerves. Drasanvi also helps to maintain a good immune system. Vitamin D3 helps the body to correctly use the calcium it receives from food and supplements. In general, it is especially recommended when it is not ingested in sufficient quantity through food, as well as in situations of low exposure to natural sunlight. It may also be of interest to adolescents who are still growing and have a vitamin D deficiency when advised by a doctor. Sometimes it is also used to help prevent osteoporosis or loss of bone mass that develops at certain ages.