Which vitamin is pivotal for calcium absorption in the body?

Vitamin D plays a crucial role in calcium absorption in the body. It enhances the intestinal absorption of calcium, allowing for adequate calcium levels necessary for various bodily functions, including bone health. Without sufficient vitamin D, the body may struggle to absorb calcium efficiently, leading to conditions such as rickets in children and osteomalacia or osteoporosis in adults.

The other vitamins listed do not directly facilitate calcium absorption. Vitamin B1 (thiamine) is primarily involved in carbohydrate metabolism, while vitamin C is essential for collagen synthesis and acts as an antioxidant. Niacin, a form of vitamin B3, is important for energy production and metabolic processes but does not influence calcium absorption. Therefore, vitamin D is indispensable for maintaining healthy calcium levels in the body.