Which vitamin is primarily responsible for calcium absorption?

Vitamin D is primarily responsible for calcium absorption in the body. It plays a crucial role in maintaining calcium homeostasis by enhancing the intestinal absorption of calcium from the diet. When vitamin D is present, it increases the expression of calcium-binding proteins in the intestinal cells, facilitating the uptake of calcium into the bloodstream.

Without sufficient vitamin D, the body struggles to absorb enough calcium, which can lead to weakened bone health and conditions like osteoporosis. The active form of vitamin D, known as calcitriol, also works with parathyroid hormone to regulate calcium levels in the blood, ensuring that an adequate supply is available for various physiological functions, including bone formation and maintenance.

This makes vitamin D vital not just for calcium absorption but also for overall skeletal health, emphasizing its significance among the vitamins related to mineral absorption and metabolism.