Scientific Name: Selenium
Clinical Test Expectation: Critical role in metabolism and thyroid function and helps protect your body from damage caused by oxidative stress. Boost your immune system, slow age-related mental decline, reduce your risk of heart disease. treatment of Hashimoto’s thyroiditis and to treat high cholesterol
MG Strength: 40mcg / ml – 10ml
Detailed Product Information
This mineral is a mineral found in soil, water, and some foods. It is important for making many body processes work correctly.
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. Crab, liver, fish, poultry, and wheat are generally good selenium sources. 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.
This mineral is used for selenium deficiency, a disease that causes underactive thyroid (autoimmune thyroiditis), and high blood pressure during pregnancy. It is also used for diseases of the heart and blood vessels, including stroke, complications from statin drugs, and abnormal cholesterol levels, as well as for many other conditions, but there is no good scientific evidence to support these uses.
Coronavirus disease 2019 (COVID-19): There is no good evidence to support using this mineral for COVID-19. Follow healthy lifestyle choices and proven prevention methods instead.
How does it work?
This mineral is important for making many body processes work correctly. It seems to increase the action of antioxidants.
Uses & Effectiveness
Likely Effective for
- Selenium deficiency. Taking this mineral by mouth is effective for preventing selenium deficiency.
Possibly Effective for
- A disease that causes underactive thyroid (autoimmune thyroiditis). Research shows that taking up to 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, general feelings of well-being, and quality of life in people with this condition. Taking selenium doses under 200 mcg daily might not be as effective, and it might be more beneficial in people with more severe cases.
- A disorder that affects the bones and joints, usually in people with selenium deficiency (Kashin-Beck disease). Some research shows that adding salt enriched with selenium to food can prevent Kashin-Beck disease in children. But selenium does not seem to improve joint pain or movement in children with Kashin-Beck disease.
- A pregnancy complication marked by high blood pressure and protein in the urine (pre-eclampsia). Pregnant women with low levels of selenium in the blood might have a higher chance of developing pre-eclampsia. Pre-eclampsia is a serious complication of pregnancy. Pregnant women taking selenium 60-100 mcg daily for up to 6 months during pregnancy might have a lower chance of having pre-eclampsia.
Possibly Ineffective for
- Asthma. There is no link between selenium blood levels and asthma. Taking 100 mcg of selenium daily for up to 24 weeks does not seem to improve quality of life, lung function, asthma symptoms, or inhaler use in people with asthma.
- Eczema (atopic dermatitis). Taking yeast that is enriched with 600 mcg of selenium daily for 12 weeks, alone or with vitamin E, does not improve the severity of eczema.
- Bladder cancer. Taking selenium does not appear to prevent bladder cancer.
- Heart disease. Taking selenium does not appear to 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 chance of developing heart disease.
- Diabetes. Most research shows that people with high levels of selenium, people who eat diets high in selenium, and people who take selenium supplements for many years have an increased risk of type 2 diabetes. For people who already have diabetes, taking selenium for 2-3 months does not seem to change blood sugar levels.
- Abnormal levels of cholesterol or blood fats (dyslipidemia). Most research shows that taking selenium supplements does not improve cholesterol levels in people with dyslipidemia.
- Swelling (inflammation) of the liver caused by the hepatitis C virus (hepatitis C). 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.
- Infants born weighing less than 2500 grams (5 pounds, 8 ounces). Selenium does not appear to reduce the chance of death in low birth weight infants. But it might reduce the chance of an infection called sepsis.
- Lung cancer. Early research showed that taking 200 mcg if selenium daily reduced the risk of lunch cancer by about 46% in people without selenium deficiency. However, a re-evaluation of this study shows that selenium did not reduce lung cancer risk in most people, but it did seem to benefit people with low selenium levels. Other research shows that taking selenium alone or with other nutrients does not reduce lung cancer risk.
- Prostate cancer. There has been a lot of interest in studying whether taking selenium lowers the chance of getting prostate cancer. Some research has found that prostate cancer seems to be less common in men with higher selenium levels in their bodies. But most large, long-term scientific studies show that selenium does not reduce the chance of getting prostate cancer.
- Scaly, itchy skin (psoriasis). Taking yeast enriched with 600 mcg of selenium daily does not seem to reduce the severity of psoriasis.
- Skin cancer. 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.
- Blood infection (sepsis). Most research shows that giving selenium along with other nutrients intravenously (by IV) does not reduce the risk of death in people with sepsis. It also does not seem to reduce the recovery time in the hospital or the risk of pneumonia or kidney failure.
Insufficient Evidence for
- Arsenic poisoning. Early research shows that taking 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.
- Cancer. Most research shows that taking selenium does not reduce the risk of cancer or cancer-related death. However, older studies suggest that it might reduce cancer risk by 24% and cancer-related death especially in men.
- Cataracts. A clinical study shows that taking 200 mcg of selenium daily with or without vitamin E daily for around 5.6 years does not reduce the risk of age-related cataracts in men.
- Critical illness (trauma). It’s unclear if giving selenium intravenously (by IV) or by mouth reduces the risk of death or infection in critically ill people. Research is conflicting.
- Abnormal cells on the surface of the cervix (cervical dysplasia). Early research shows that taking 200 mcg of selenium daily might reduce the amount of abnormal cells on the cervix in women with a specific type of cervical dysplasia called cervical intraepithelial neoplasia or CIN.
- Colon cancer, rectal cancer. Early research suggests that blood levels of selenium are not linked with the risk of colon and rectal cancer. Also, most research shows that taking selenium does not reduce the risk of colon and rectal cancer. But some research shows that selenium reduces the risk of colon and rectal cancer in some patients. Reasons for the conflicting findings are not clear. Different selenium formulas and type of colon cancer might affect findings. Also, selenium might work better in people with lower blood levels of selenium before treatment. Some early research shows that taking selenium with other antioxidants might protect against recurrence of polyps in the colon. Selenium alone seems to protect against recurrence of only certain type of advanced polyps.
- Diseases, such as Alzheimer disease, that interfere with thinking (dementia). Early research shows that taking 200 mcg of selenium daily for 4 years does not prevent dementia.
- Kidney damage in people with diabetes (diabetic nephropathy). Research shows that taking selenium reduces insulin resistance but does not improve blood sugar or kidney function in people with kidney disease and diabetes.
- Weakened and enlarged heart (dilated cardiomyopathy). Early research has found that taking selenium is linked with a lower risk of heart death in people with a specific type of dilated cardiomyopathy called Keshan disease.
- Cancer of the esophagus. Taking selenium supplements does not seem to lower the risk of esophageal cancer.
- HIV/AIDS. 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.
- Overactive thyroid (hyperthyroidism). Research shows that giving selenium with drug therapy does not improve symptoms in people with Grave’s hyperthyroidism.
- Underactive thyroid (hypothyroidism). Some research shows that taking a selenium supplement might increase the conversion of thyroid hormones in older people. However, other research suggests that it has no benefit. Taking selenium can make hypothyroidism worse in people who are iodine deficient. Taking selenium daily during pregnancy seems to reduce the risk of developing thyroid dysfunction after pregnancy and permanent hypothyroidism.
- Liver cancer. Early research in China suggests that taking selenium for 2-5 years can reduce the occurrence of liver cancer. It is unclear if taking selenium will reduce the risk of liver cancer in Western countries.
- Mercury poisoning. Early research shows that taking yeast enriched with selenium seems to decrease how much mercury the body absorbs in Chinese people exposed to high levels of mercury in the environment.
- A group of inherited disorders that cause muscle weakness and muscle loss (muscular dystrophy). Early research suggests that taking a water-soluble form of selenium daily for 6 months does not benefit people with muscular dystrophy.
- Osteoarthritis. 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.
- Ovarian cancer. Research suggests that there is no link between selenium consumption in the diet and the risk for ovarian cancer.
- Death from any cause. Analysis of many studies suggests that taking selenium does not seem to have an effect on overall death risk. However, some research suggests that 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. Other research suggests that selenium, taken alone or with other nutrients, does not reduce the risk of death.
- Pancreatic cancer. Increased selenium intake has been linked with a reduced risk of cancer of the pancreas. But other research has found that selenium levels in the blood are not linked with the risk of cancer of the pancreas.
- Swelling (inflammation) of the pancreas (pancreatitis). 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.
- A hormonal disorder that causes enlarged ovaries with cysts (polycystic ovary syndrome or PCOS). Early research shows that taking a selenium supplement along with a probiotic supplement improves depression, anxiety, and stress by a small amount in women with PCOS. But it’s not clear if this effect is from selenium, the probiotic, or the combination.
- Swelling in the arms or legs caused by damage to the lymph system (lymphedema). Early evidence suggests that taking selenium supplements for 15 weeks might prevent bacterial skin infections in women with swelling in the arms and legs after breast cancer surgery.
- High blood pressure during pregnancy. Early research suggests that taking 100 mcg of selenium liquid daily for 6-8 weeks during pregnancy can reduce the occurrence of high blood pressure.
- Diarrhea caused by radiation therapy. Early research suggests that taking 500 mcg of selenium on days of radiation therapy and 300 mcg on days without treatments reduces diarrhea by about 54%.
- Rheumatoid arthritis (RA). Evidence on the effects of selenium on rheumatoid arthritis is mixed. 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.
- Muscle weakness caused by statin drugs (statin-induced myopathy). Early research suggests that taking 200 mcg of selenium daily with or without coenzyme Q10 for 3 months does not improve symptoms of statin-induced myopathy.
- Thyroid cancer. One small study suggests that taking selenium supplements is linked with a reduced risk for thyroid cancer.
- Abnormal pap smears.
- Liver disease in people who drink alcohol.
- Flu (influenza).
- Kidney damage caused by cancer drugs.
- Chronic fatigue syndrome (CFS).
- Liver scarring (cirrhosis).
- Gray hair.
- Surgery to improve blood flow to the heart (CABG surgery).
- Hay fever.
- Hearing loss caused by the drug cisplatin.
- Heart failure.
- A type of inflammatory bowel disease (ulcerative colitis).
- Macular degeneration (eye disease).
- Conditions in a man that prevent him from getting a woman pregnant within a year of trying to conceive (male infertility).
- Mood disorders.
- Preventing miscarriage.
- Stomach cancer.
- Toxicity from cancer drugs.
- Other conditions.
Side Effects & Safety
When taken by mouth: This mineral is LIKELY SAFE for most people when taken by mouth in doses less than 400 mcg daily, short-term. However, selenium is POSSIBLY UNSAFE when taken by mouth in high doses or for a long time. Taking doses above 400 mcg can increase the risk of developing selenium toxicity. Taking lower doses for a long time, such as doses that are higher than the recommended dietary allowance (RDA), can also increase the risk of developing diabetes.
Selenium can cause muscle tenderness, tremor, lightheadedness, facial flushing, blood clotting problems, liver and kidney problems, and other side effects. 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.
Special Precautions & Warnings:
Pregnancy and breast-feeding: This mineral 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 taken by mouth in doses above 400 mcg daily. This dose might cause toxicity, and in HIV-positive women, it might increase virus levels in breast milk.
Children: This mineral is POSSIBLY SAFE when taken by mouth appropriately. This mineral seems to be safe when used short-term in doses below 45 mcg daily for infants up to age 6 months, 60 mcg daily for infants 7 to 12 months, 90 mcg daily for children 1 to 3 years, 150 mcg daily for children 4 to 8 years, 280 mcg daily for children 9 to 13 years, and 400 mcg daily for children age 14 years and older.
Autoimmune diseases: This mineral 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.
Hemodialysis: Blood levels of this mineral 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.
Under-active thyroid (hypothyroidism): 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.
Fertility problems in men: This mineral might decrease the ability of sperm to move, which could reduce fertility. If you are trying to father a child, don’t take selenium supplements.
Skin cancer: Long-term use of this mineral 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.
Surgery: This mineral might increase the risk of bleeding during and after surgery. Stop taking selenium at least 2 weeks before a scheduled surgery.
Be cautious with this combination
- Medications that slow blood clotting (Anticoagulant / Antiplatelet drugs) interacts with this mineralThis mineral 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), dalteparin (Fragmin), enoxaparin (Lovenox), heparin, ticlopidine (Ticlid), warfarin (Coumadin), and others.
- Medications used for lowering cholesterol (Statins) interacts with this mineralTaking this mineral, 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).
- Niacin interacts with SELENIUMTaking this mineral 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.
- Sedative medications (Barbiturates) interacts with SELENIUMThe body breaks down medications to get rid f them. This mineral 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.
- Warfarin (Coumadin) interacts with SELENIUMThis mineral 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 this combination
- Birth control pills (Contraceptive drugs) interacts with SELENIUMSome research shows that women who take birth control pills might have increased blood levels of this mineral. 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 interacts with SELENIUMGold salts bind to this mineral and decrease this mineral in parts of the body. This might decrease the normal activity of this mineral, possibly resulting in symptoms of selenium deficiency.Gold salts include aurothioglucose (Solganal), gold sodium thiomalate (Aurolate), and auranofin (Ridaura).
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