VITAMIN D - 25 HYDROXY (D2+D3) Vitamin D is a fat-soluble vitamin that is crucial for several physiological functions in the body. Its primary role includes regulating calcium and phosphorus absorption, which are essential for maintaining healthy bones and teeth. Beyond skeletal health, vitamin D also supports immune function, cardiovascular health, and muscle function. Research has increasingly linked adequate vitamin D levels to reduced risks of chronic diseases such as diabetes, hypertension, and certain cancers.