Which nutrient is also important to supplement when trying to increase calcium intake?

Vitamin D plays a crucial role in facilitating calcium absorption in the intestine and maintaining adequate serum calcium and phosphate levels, which is essential for normal bone mineralization. Without sufficient vitamin D, the body struggles to absorb calcium efficiently, even if calcium intake is adequate from dietary sources or supplements. This relationship highlights the importance of vitamin D as a complement to calcium intake; without sufficient vitamin D, increasing calcium by itself may not effectively support bone health or prevent conditions like osteoporosis.

In contrast, while vitamin C, iron, and potassium have their own important roles in the body—such as supporting immune function, oxygen transport, and heart health, respectively—they do not have the same direct relationship with calcium absorption as vitamin D. Therefore, focusing on vitamin D alongside calcium supplementation is key for achieving optimal results in calcium utilization and overall skeletal health.