Updated: June 15, 2019
Selenium is a mineral found in the soil. Selenium is naturally found in water and some foods. This amazing nutrient is vital to your health. Selenium is an essential mineral, which must be obtained through your diet. Though it is only needed in small amounts, but plays a major role in important processes in the body like metabolism and thyroid function. It seems to increase the action of antioxidants. Antioxidants are compounds in foods that prevent cell damage caused by free radicals. Free radicals are normal byproducts of processes like metabolism that occur in your body on a daily basis. They perform important functions, including protecting the body from disease.
Oxidative stress caused by smoking, alcohol use and stress can cause an excess of free radicals which has been linked to chronic diseases like heart disease, Alzheimerâs disease and cancer, as well as premature aging and the risk of stroke. Antioxidants like selenium help reduce oxidative stress by keeping a balance of free radical.
Most of the selenium in the body comes from the diet. The amount of selenium in food depends on where it is grown or raised. Selenium content of food is largely dependent on location and soil conditions, which vary widely. The amount of selenium in soils varies a lot around the world, which means that the foods grown in these soils also have differing selenium levels. In the U.S., the Eastern Coastal Plain and the Pacific Northwest have the lowest selenium levels. People in these regions naturally take in about 60 to 90 mcg of selenium per day from their diet. Although this amount of selenium is adequate, it is below the average daily intake in the U.S., which is 125 mcg.
Foods rich in selenium include seafood, nuts and mushrooms. It is important to consume a variety of foods that include Nuts, like Brazil nuts and walnuts; many fresh and saltwater fish, like tuna, cod, red snapper, and herring; beef and poultry; grains.
Good natural food sources of selenium include:
Adding more selenium-rich foods to your diet is an excellent way to maintain good health. Whole foods are the best sources of selenium. The mineral may be destroyed during processing.
Taking selenium by mouth is effective for preventing selenium deficiency.
Taking 200 mcg of selenium daily along with thyroid hormone might decrease antibodies in the body that contribute to this condition. Selenium might also help improve mood and general feelings of well-being in people with this condition.
Taking a 100-200 mcg of a specific selenium supplement (SelenoPrecise, Pharma Nord, Denmark) daily for 6 months can modestly reduce cholesterol levels. Many people have low levels of selenium in their body with high level of cholestrol. It is not clear if taking extra selenium would have any benefit on cholesterol levels in people with normal selenium levels in the body.
There is no link between selenium blood levels and asthma. Taking 100 mcg of selenium daily for up to 24 weeks does not improve quality of life, lung function, asthma symptoms, or inhaler use in people with asthma.
Taking yeast that is enriched with 600 mcg of selenium daily for 12 weeks, alone or together with vitamin E, does not improve the severity of eczema.
Taking selenium does not reduce the risk of heart disease. In people who already have heart disease, taking 100 mcg of selenium in combination with beta-carotene, vitamin C, and vitamin E does not seem to prevent the condition from becoming worse. Also, taking 200 mcg of selenium daily for almost 8 years does not reduce the risk of developing heart disease.
Taking vitamins C and E with selenium does not prevent kidney damage or hearing loss in people being treated with cisplatin.
Giving 500-1000 mcg of selenium intravenously (by IV) or 300 mg of selenium (ebselen) by mouth daily to critically ill people does not seem to reduce the risk of death or infection.
People with low selenium levels have a higher chance of developing type 2 diabetes. However, people who have high levels of selenium also have an increased risk of type 2 diabetes. People who take 200 mcg of selenium daily for about 7.7 years have an increased chance of developing type 2 diabetes.
Taking 200 mcg of selenium along with vitamin C and vitamin E for 6 months does not improve liver function or virus levels in people with hepatitis C.
Taking 100-200 mcg of selenium daily, alone or together with vitamin A, vitamin C, and vitamin E, for 3-4 months, does not improve sperm function in infertile men.
Daily selenium supplementation, 7 mcg/kg by mouth or 5 mcg/kg intravenously (by IV), does not appear to improve health in low birth weight infants.
Taking 200 mcg of selenium daily reduced the risk of lunch cancer by about 46% in people without selenium deficiency. However, selenium did not reduce lung cancer risk in most people, but it did seem to benefit people with low selenium levels. Taking selenium alone or with other nutrients does not reduce lung cancer risk.
Prostate cancer seems to be less common in men with higher selenium levels in their bodies. However, selenium does not reduce the chance of getting prostate cancer.
Taking yeast enriched with 600 mcg of selenium daily does not reduce the severity of psoriasis.
Taking 200 mcg of selenium does not seem to reduce the risk of getting a certain type of skin cancer called basal cell carcinoma. In fact, some scientific evidence suggests that taking extra selenium might actually increase the risk of getting another type of skin cancer called squamous cell carcinoma.
Taking 200 mcg of selenium along with zinc and vitamin E daily can reduce the amount of time spent in the hospital and the risk of death in people with alcohol-related liver disease.
Yeast enriched with selenium seems to decrease how much arsenic the body absorbs in Chinese people exposed to high levels of arsenic in the environment.
Taking 315-380 mcg of selenium along with copper and zinc daily can reduce the risk of pneumonia in people being treated in the hospital for burns. However, the same combination might reduce the amount of time spent in the hospital but does not affect wound healing
Taking 400 mcg of selenium daily for 2 years or 100 mcg of selenium along with zinc, vitamin C, vitamin E, and beta-carotene daily for 7.5 years does not reduce the risk of developing cancer. However, taking selenium might reduce the risk of cancer-related death. Selenium might reduce the risk of cancer in men only, while selenium plus allitridum might decrease the risk of cancer in women only.
The effect of selenium on colon and rectal cancer is conflicting. A population study suggests that low selenium blood levels are not linked with an increased risk of developing colon and rectal cancer. Some research suggests that taking selenium, alone or with antioxidants, might reduce the risk of colon and rectal cancer or precancerous sores. However, other research suggests that selenium has no effect.
Taking selenium supplements does not seem to lower the risk of esophageal cancer.
Taking selenium in combination with vitamin C and vitamin E for about 7 years does not seem to reduce the risk of developing precancerous stomach sores.
There is contradictory evidence about the effect of selenium supplements on HIV. Some evidence shows that taking selenium daily for up to 2 years can slow how quickly HIV spreads and can increase immune function. However, other early research shows that selenium has no effect.
Taking selenium with vitamin A, vitamin C, methionine, and coenzyme Q10 for 12 weeks does not seem to improve fatigue or other symptoms in people with primary biliary cirrhosis.
Taking a selenium supplement might increase the conversion of thyroid hormones in older people. However, some research suggests that it has no benefit. Taking selenium can make hypothyroidism worse in people who are iodine deficient.
Administering selenium (ebselen) within 24 hours of a stroke improves recovery.
Selenium does not seem to improve joint pain or movement in children with Kashin-Beck disease.
Taking selenium for 2-5 years can reduce the occurrence of liver cancer. However, it is unclear if taking selenium will reduce the risk of liver cancer in Western countries.
There is no link between selenium consumption in the diet and the risk for ovarian cancer.
Taking a water-soluble form of selenium daily for 6 months does not benefit people with muscular dystrophy.
Low selenium levels seem to be linked with an increased risk of developing osteoarthritis. However, it is not known if selenium supplements can prevent osteoarthritis.
Evidence on the effects of selenium on rheumatoid arthritis is inconsistent. Some research suggests that taking yeast enriched with 200 mcg of selenium does not improve RA. However, other research suggests that taking 200 mcg of selenium daily for 3 months reduces joint swelling, tenderness, and stiffness in people with RA.
Taking 100 mcg of selenium along with zinc, vitamin C, vitamin E, and beta-carotene daily for 7.5 years might lower the risk of death from any cause in men, but not women. However, some research suggests that selenium, taken alone or with other nutrients, does not reduce the risk of death.
Evidence is conflicting about the effect of selenium on pancreatitis. Some research suggests that selenium has no benefit. However, other research suggests that taking a water-soluble form of selenium daily might reduce the risk of death caused by severe pancreatitis.
Taking selenium supplements for 15 weeks might prevent bacterial skin infections in women with swelling in the arms and legs after breast cancer surgery.
Taking 100 mcg of selenium liquid daily for 6-8 weeks during pregnancy can reduce the occurrence of high blood pressure.
Administering selenium alone or with other antioxidants might reduce the risk of death caused by severe sepsis. However, aome research suggests that administering selenium with L-arginine, omega-3 fatty acids, vitamin E, beta carotene, and zinc may increase the risk of death in people with sepsis.
Taking selenium with fish oil, natural sweeteners, gum arabic, vitamin E, and vitamin C does not benefit people with an inflammatory bowel disease called ulcerative colitis. However, taking this same combination does seem to reduce the need for medications.
More evidence is needed to rate selenium for the below uses:
Selenium is likely safe for most people when taken by mouth in doses less than 400 mcg daily, short-term. Selenium is possibly unsafe when taken by mouth in high doses or for long-term. Taking doses above 400 mcg can increase the risk of developing selenium toxicity. Taking lower doses long-term can increase the risk of developing diabetes.
High doses of selenium can cause significant side effects including nausea, vomiting, nail changes, loss of energy, and irritability. Poisoning from long-term use is similar to arsenic poisoning, with symptoms including hair loss, white horizontal streaking on fingernails, nail inflammation, fatigue, irritability, nausea, vomiting, garlic breath odor, and a metallic taste. Selenium can also cause muscle tenderness, tremor, lightheadedness, facial flushing, blood clotting problems, liver and kidney problems, and other side effects.
Selenium is possibly safe when taken by mouth appropriately. Selenium seems to be safe when used in the short-term in doses
Selenium use is possibly safe during pregnancy and breast-feeding when used short-term in amounts that are not above 400 mcg daily. Selenium is possibly unsafe in pregnancy and breastfeeding when taking by mouth in doses above 400 mcg daily, as this might cause toxicity.
Selenium might stimulate the immune system. In theory, selenium might make autoimmune disease worse by stimulating the activity of the disease. People with autoimmune diseases such as multiple sclerosis, systemic lupus erythematosus (SLE), rheumatoid arthritis (RA), and other should avoid taking selenium supplements.
Blood levels of selenium can be low in people undergoing hemodialysis. Using a dialysis solution with selenium might increase selenium levels, but selenium supplementation might be needed for some people.
Selenium might decrease the ability of sperm to move, which could reduce fertility. Don't take selenium supplements if you are trying to father a child.
Long-term use of selenium supplements might slightly increase the risk of skin cancer recurrence, but this is controversial. Until more is known about the possible increase in skin cancer risk, avoid long-term use of selenium supplements if you have ever had skin cancer.
Taking selenium can worsen hypothyroidism especially in people with iodine deficiency. In this case, you should take iodine along with selenium. Check with your healthcare provider before taking any supplements.
Selenium might increase the risk of bleeding during and after surgery. Stop taking selenium at least 2 weeks before a scheduled surgery.
Be cautious with the below combination as these can have moderate interaction:
Selenium might slow blood clotting. Taking selenium along with medications that also slow clotting might increase the chances of bruising and bleeding. Some medications that slow blood clotting include aspirin, clopidogrel (Plavix), ticlopidine (Ticlid), dalteparin (Fragmin), enoxaparin (Lovenox), heparin, warfarin (Coumadin), and others.
Taking selenium, beta-carotene, vitamin C, and vitamin E together might decrease the effectiveness of some medications used for lowering cholesterol. It is not known if selenium alone decreases the effectiveness of some medications used for lowering cholesterol. Some medications used for lowering cholesterol include atorvastatin (Lipitor), fluvastatin (Lescol), lovastatin (Mevacor), and pravastatin (Pravachol).
Taking selenium along with vitamin E, vitamin C, and beta-carotene might decrease some of the beneficial effects of niacin. Niacin can increase the good cholesterol. Taking selenium along with these other vitamins might decrease the how well niacin works for increasing good cholesterol.
The body breaks down medications to get rid f them. Selenium might slow how fast the body breaks down sedative medications (Barbiturates). Taking selenium with these medications might increase the effects and side effects of these medications.
Selenium might thin the blood. Selenium might also increase the effects of warfarin in the body. Taking selenium along with warfarin might increase the chances of bruising and bleeding.
Be watchful with the below combination as these can have minor Interaction:
Some research shows that women who take birth control pills might have increased blood levels of selenium. But other research shows no change in selenium levels in women who take birth control pills. There isn't enough information to know if there is an important interaction between birth control pills and selenium. Some birth control pills include ethinyl estradiol and levonorgestrel (Triphasil), ethinyl estradiol and norethindrone (Ortho-Novum 1/35, Ortho-Novum 7/7/7), and others.
Gold salts bind to selenium and decrease selenium in parts of the body. This might decrease the normal activity of selenium, possibly resulting in symptoms of selenium deficiency. Gold salts include aurothioglucose (Solganal), gold sodium thiomalate (Aurolate), and auranofin (Ridaura).
The following doses have been studied in scientific research and is recommended:
200 mcg daily.
100-200 mcg daily of a specific selenium product (SelenoPrecise, Pharma Nord, Denmark).
Due to the demands of the fetus on the mother, the dietary need for selenium increases during pregnancy.
The RDA for infants has not been determined. For infants up to 6 months old, 2.1 mcg/kg is adequate intake (AI). The AI for infants 7-12 months is 2.2 mcg/kg per day.
Adults, 400 mcg per day for adults and adolescents 14 years and older.
The tolerable upper intake level (UL) for infants up to age 6 months is 45 mcg per day
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