Vitamin D is essential for calcium absorption and overall bone health. It plays a crucial role in maintaining appropriate levels of calcium and phosphorus within the body, which are vital for strong bones and teeth. A deficiency in vitamin D can lead to decreased calcium absorption, potentially resulting in conditions like osteoporosis. Sources of vitamin D include sunlight exposure, fatty fish, fortified dairy products, and supplements. Proper vitamin D levels are vital, especially for individuals at higher risk of bone-related health issues.