Vitamin D is essential for calcium absorption in the body, playing a critical role in maintaining bone health and overall metabolic functions. It assists in the regulation of calcium levels in the blood, ensuring sufficient mineralization of the bone matrix. Low levels of vitamin D can lead to inadequate calcium absorption and, subsequently, conditions such as osteoporosis. Regular exposure to sunlight and dietary sources like fatty fish, fortified dairy products, and supplements can help individuals maintain adequate vitamin D levels, supporting optimal skeletal health.