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GSP seeks healthy life of customers, provides customers with the benefit of the natural and produces the product with high quality assurance and advanced production technologies. GSP will be the company to make a healthy tomorrow by providing creative services all the time. Metabolic regulation of calcium and phosphorus Major function of vitamin D is to regulate the level of calcium and phosphorus in blood into normal scope and to keep balance. Concentration of calcium and phosphorus in blood is regulated within the range that can help the function of neural muscle or bone minerals. This regulation increases the absorption of calcium and phosphorus in small intestine by 1,25(OH)2D. If intake of vitamin D is insufficient, there is any disturbing factor in absorbing fat, its generation in winter seasons is insufficient, the level of 25(OH)D3 becomes lower and the level of 1,25(OH)2D3 and calcium in blood lower too. At that moment, the concentration of parathyroid glans ho...