Which vitamin is essential for calcium absorption?

Vitamin D is essential for calcium absorption because it facilitates the intestinal absorption of calcium and phosphorus, which are necessary for forming and maintaining healthy bones. Without adequate levels of vitamin D, the body struggles to absorb calcium from the diet, leading to potential bone density issues and disorders such as rickets in children and osteomalacia in adults. Vitamin D also plays a significant role in regulating calcium levels in the bloodstream, ensuring that bones receive the calcium they need for strength and structure. The other vitamins listed do not have this specific role in calcium absorption; they serve different functions within the body, such as supporting immune function or acting as antioxidants, but do not influence calcium uptake in the digestive system.