The oyster shell is burned is the Chinese herbal medicine calcined oyster Effects: astringent solid astringent, the system acid pain, heavy town calm, soften and disperse the knot. But eating the shell can not supplement calcium! But also affect the digestion and absorption of the shell is composed of calcium carbonate and eat stone almost offset stomach acid digestion of food, thus affecting the absorption of calcium to eat milk calcium, ionized calcium, calcium protein and other organic small molecules of calcium substances to be absorbed Oh