Calcitriol is the active form of vitamin D in the body, primarily produced in the kidneys. It plays a crucial role in regulating calcium and phosphate levels, which are essential for maintaining healthy bones and teeth. Calcitriol helps the intestines absorb calcium from food and promotes bone mineralization. In addition to its role in bone health, calcitriol also influences the immune system and may have effects on cell growth and differentiation. It is often used in the treatment of conditions like chronic kidney disease and osteoporosis, where maintaining proper calcium levels is vital for overall health.