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Cholecalciferol (Vitamin D3) is a high-activity fat-soluble vitamin conforming to domestic pharmaceutical and food-grade standards, and the most biologically active form of natural vitamin D. It is an essential nutrient for human calcium and phosphorus metabolism, efficiently promoting intestinal calcium and phosphorus absorption, maintaining bone density and normal skeletal development, and regulating body immune function. Compared with vitamin D2, it has higher absorption and utilization rate in human body. Widely used in compound vitamin preparations, calcium supplement health products, pediatric nutritional fortification and pharmaceutical raw materials, it is the mainstream industrial-grade vitamin D raw material for daily nutritional supplementation and clinical adjuvant treatment.