The Functions and Sources of Vitamin D and Vitamin K.

Vitamin D is a fat-soluble nutrient that helps build and maintain healthy bones, supports the immune, muscle, and nervous systems, and reduces the risk of dementia and cancer. A lack of vitamin D can lead to bone deformities, and it is especially crucial for athletes and those in contact sports. The amount of vitamin D needed daily depends on age, and it is recommended to get it from sunlight, fortified foods, or supplements. Vitamin D also plays a role in protecting against anxiety disorders and promoting the growth of healthy gut bacteria, which reduces symptoms of depression and schizophrenia.