Cost per serving
$0.04
mineral · 42 active deals
Every Selenium deal here is ranked by cost per dose— what you actually pay per serving, not the sticker price. Forms and absorption differ, so the cheapest bottle isn’t always the cheapest dose.
Right now the best value across our full Selenium catalog is at $0.04 per serving.
Recommended daily intake
Narrow safe range; one Brazil nut already covers the DV. General FDA/NIH adult guidance — not medical advice.
Selenium is an essential mineral that the body incorporates into 25 selenoproteins, including glutathione peroxidases, thioredoxin reductases, and selenoprotein P; per the NIH Office of Dietary Supplements, these selenoproteins play critical roles in thyroid hormone metabolism, DNA synthesis, reproduction, and protection from oxidative damage and infection. Because selenium has antioxidant properties and effects on DNA repair, apoptosis, and the endocrine and immune systems, it has been hypothesized to play a role in cancer prevention, but while some observational studies and one early trial suggested a lower risk (e.g., of prostate cancer), more recent randomized trials such as SELECT found that supplementation did not reduce cancer risk, and the NIH notes the evidence is limited and not conclusive. Selenium has also been studied in relation to cardiovascular disease, cognitive decline and Alzheimer's disease, HIV infection, male fertility, and thyroid disease, but the NIH states the evidence for these uses is generally limited, mixed, or insufficient to draw firm conclusions. In certain low-selenium regions, deficiency has been associated with conditions such as Keshan disease and Kashin-Beck disease, and it could exacerbate iodine deficiency, though deficiency is very rare in the United States — per the NIH Office of Dietary Supplements; not medical advice.
According to the fact sheet, the forms of selenium commonly found in dietary supplements include selenomethionine, selenium-enriched yeast (grown in a high-selenium medium, predominantly as selenomethionine), sodium selenite, and sodium selenate. The NIH states that the human body absorbs up to about 90% of the selenium from these forms. Selenium is available in multivitamin/mineral supplements (many containing 55 mcg), in combination products with vitamin E or other ingredients (generally 50 to 200 mcg), and as stand-alone selenium-only supplements (typically 100 to 400 mcg).
Because selenium is bound to protein in foods, high-protein foods tend to be the best sources: Brazil nuts, seafood, meat, poultry, and organ meats are the richest food sources, with Brazil nuts containing particularly high amounts (an average of about 544 mcg per ounce, though values vary widely). Other sources include cereals and other grains and dairy products, and the major dietary sources in the United States are breads, grains, meat, poultry, seafood, and eggs. Selenium levels in plant-based foods vary widely by geographic location because of differences in the amount and form of selenium in the soil — per the NIH Office of Dietary Supplements.
Selenium deficiency is very rare in the United States and Canada, but groups at higher risk of inadequate intakes include people living in selenium-deficient regions (such as parts of China where soil selenium is very low), people undergoing kidney dialysis, and people living with HIV. On its own, selenium deficiency rarely causes overt illness, but it produces biochemical changes that may predispose people under additional stress to conditions such as Keshan disease (an endemic cardiomyopathy) and Kashin-Beck disease (a type of osteoarthritis), and it may exacerbate iodine deficiency, potentially increasing the risk of congenital hypothyroidism in infants — per the NIH Office of Dietary Supplements.
Selenosis results from chronically high selenium intakes and is most commonly characterized by hair loss and nail brittleness or loss, with other possible signs including a garlic odor in the breath, a metallic taste in the mouth, skin rash, nausea, diarrhea, fatigue, irritability, and nervous system abnormalities; acute toxicity from misformulated products can cause severe gastrointestinal, neurological, cardiac, and kidney effects and, rarely, death. The Tolerable Upper Intake Level (UL) for selenium is 400 mcg for adults, ranging from 45 mcg to 400 mcg for infants, children, and adolescents depending on age — per the NIH Office of Dietary Supplements.
Cost per serving
$0.04
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$0.05
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$0.11
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$0.06
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$0.05
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$0.06
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$0.08
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$0.09
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$0.06
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$0.07
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$0.12
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$0.06
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$0.09
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$0.05
Cheap·−76%Cost per serving
$0.09
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$0.09
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$0.10
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$0.09
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$0.09
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$0.08
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$0.13
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$0.08
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$0.11
PriceyCost per serving
$0.07
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$6.18
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$5.43
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$11.62
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$8.79
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$5.59
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$8.69
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$23.54
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$9.09
HerbsPro · 🥦 Selenium
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$10.15
HerbsPro · 🥦 Selenium
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$11.79
HerbsPro · 🥦 Selenium
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Price
$7.10
HerbsPro · 🥦 Selenium
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$10.50
HerbsPro · 🥦 Selenium
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$12.91
Dosage, upper-limit, deficiency and interaction facts are sourced from the NIH Office of Dietary Supplements Selenium fact sheet. General information, not medical advice.