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Selenium is a trace mineral that the human body needs in order to function properly. Most people, including children, get plenty of selenium from food. However, other people may have a deficiency and need supplementation. It is claimed to be useful for treating or preventing various medical conditions, such as HIV or AIDS, heart disease, and arthritis.
It's important to talk to your healthcare provider if you are considering taking selenium supplements. Let him or her know if you have an underactive thyroid, skin cancer, or any allergies. It is possible to overdose on this trace mineral, so be sure to seek immediate medical attention if you think you may have taken too much.
(Click Selenium for more information on taking these supplements. This article discusses how selenium works, why it is difficult to recommend a standard dosage, and more.)