Vitamin D is essential for the regulation of calcium and phosphorus, making it necessary for musculoskeletal health. Although vitamin D is produced in the skin after exposure to sunlight (UVB), intake from food or even supplements is considered necessary, as exposure to the appropriate sunlight is not always possible or must be limited.
For many years, vitamin K was considered important only for blood clotting, but recently more and more of its health benefits have been demonstrated, especially regarding bones and joints. Vitamin K promotes the production of osteocalcin, thus improving bone mass and reducing the risk of fractures and bone deterioration.