what does vitamin mean? Vitamins can be considered organic compounds that must be consumed in small amounts to carry out specific biological functions for the regular maintenance of an organism's optimum growth and health. A vital component of the body's health and operation is the fat-soluble vitamin D, medically known as calciferol. This vitamin is crucial for supporting the immune system, promoting the development and maintenance of strong bones and teeth, and balancing the levels of calcium and phosphorus in the body. A healthy diet, exposure to the sun, and dietary supplements are all good ways to get enough vitamin D. Factors for lacking vitamin D Vitamin D deficiency is caused by inadequate sun exposure and a diet low in vitamin D. Strict vegetarians Severe alcohol addicts P eople with liver and kidney diseases People with fat malabsorption syndromes are among those who lack vitamin D. How vitamin D affects bones and muscles? The plasma levels of calcium and phosphate†in