Minerals play an important role in your health, and selenium is a trace mineral needed in small amounts. The recommended minimum dietary allowance is 55 mg if you are 19 or older and slightly more if you are pregnant or lactating. Your thyroid and immune system use selenium to function properly. Your thyroid produces key hormones that control your metabolism. Selenium supplements are helpful if you are lacking, but there are precautions you need to take.
Diabetes
Selenium supplements are available in a variety of dosages, but keep in mind that your body needs only a small amount and the effects of long-term use are not completely known. Trace minerals are essential to your healthy, but higher than recommended amounts can cause adverse health effects. Taking selenium at 200 mcg or more daily for more than seven years increases your diabetes risk, according to the University of Maryland Medical Center.
Hypothyroidism
Hypothyroidism, or underactive thyroid, is when your thyroid is not able to manufacture enough thyroid hormones to meet your needs. Taking selenium can worsen you condition if you have hypothyroidism, according to Medline Plus. This is especially so if your iodine level are low. Iodine is another trace mineral important to thyroid function. Take selenium only under the supervision of your health care provider if you have hypothyroidism. Your doctor will check your iodine levels, as you might need to take selenium and iodine together.
Pregnancy and Male Fertility
Consult your doctor before taking selenium if you are pregnant or nursing. Using amounts that do not exceed 400 mcg might be safe for the short term, according to Medline Plus. Do not take selenium while you are attempting to father a child, as selenium can affect your fertility. According to Medline Plus, selenium can affect sperm's ability to move.
Drug Interactions
Selenium can increase bleeding if you are taking anti-coagulant medications such as warfarin and heparin. Corticosteroids, such as prednisone and the mood stabilizer depakote, can lower selenium levels in your body. Consult your doctor if you are taking any medication.
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