, also known as calciferol, is a vital fat-soluble vitamin, often referred to as the "sunshine vitamin" for its natural formation in the body through sunlight exposure on the skin. This essential nutrient undergoes conversion in the kidneys to produce calcitriol, the most active form of Vitamin D, benefiting the intestines and bones. As we age, our skin's ability to synthesize Vitamin D diminishes, compounding the risk of deficiency among elderly individuals. Current estimates indicate that approximately one billion people worldwide suffer from Vitamin D deficiency. The primary role of Vitamin D revolves around the maintenance of normal blood calcium and phosphorus levels, crucial for bone strength. It effectively aids calcium absorption, supporting bone mineralization alongside other vitamins, minerals, and hormones. Insufficient levels of Vitamin D can lead to weakened, brittle bones, as well as increasing the risk of health issues like rickets in children and osteomalacia in adults.