Which vitamin is known for its role in calcium absorption?

Vitamin D is essential for calcium absorption in the body. It facilitates the absorption of calcium from the gut into the bloodstream, playing a critical role in maintaining bone health and overall calcium homeostasis. Without adequate vitamin D, the body struggles to absorb sufficient calcium, which can lead to bone disorders such as rickets in children and osteomalacia in adults.

Vitamin A, while important for vision and immune function, does not have a direct role in calcium absorption. Similarly, vitamin B12 is crucial for red blood cell formation and neurological function but has no involvement in calcium absorption. Vitamin E is known for its antioxidant properties, which contribute to cellular protection rather than affecting calcium metabolism. Hence, the prominence of vitamin D in calcium absorption makes it the correct answer to this question.