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Beryllium is found in plants and animals. It is necessary for the normal metabolism of magnesium and phosphorus in the human body, it inhibits the activity of some enzymes. If there is an excess of beryllium in the human diet, a soluble beryllium phosphate that cannot be absorbed by the body is formed in the intestines - the body begins to lack phosphorus, bones become soft, and beryllium rickets develops. Beryllium and its compounds, especially organic ones, are poisonous, poisoning causes beryllium disease.