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Selenium is a chemical element (atomic number 34), its symbol is Se. It’s a non-metal that is chemically similar to sulfur and tellurium. It exists in different forms, one of which is stable, gray and similar to a metal. In nature is found in minerales made up of sulphides, such as pyrite. It is a trace element present in the diet of all known forms of life; it is a component of a unique amino acid known as selenocysteine. Selenium contributes to the maintenance of hair and nail health, normal immune system and thyroid function, and it protects cells from oxidative stress.