PlainVitamins

A form of selenium

Sodium selenite supplements

660 selenium products in the NIH label database list selenium as sodium selenite (8% of the 7,934 selenium products); their median is 55 mcg of selenium per serving, against 55 mcg across all selenium products (DSLD version 9.4.0, January 2026).

How does sodium selenite compare with the other forms?

The median amount of selenium per serving in products naming each form; the count in brackets. The amount is the selenium the label gives, as printed (the Supplement Facts row normally states the element; a row named as the compound usually gives the compound's weight and is left out of these figures).

Median selenium per serving by form

Selenium by formSelenomethionine70 mcg (3,041)Sodium selenate55 mcg (709)Sodium selenite55 mcg (660)Selenium glycinate55 mcg (463)Selenium yeast75 mcg (351)
Selenium by formSelenomethionine70 mcg (3,041)Sodium selenate55 mcg (709)Sodium selenite55 mcg (660)Selenium glycinate55 mcg (463)Selenium yeast75 mcg (351)
Selenium by formSelenomethionine70 mcg (3,041)Sodium selenate55 mcg (709)Sodium selenite55 mcg (660)Selenium glycinate55 mcg (463)Selenium yeast75 mcg (351)
Selenium by formSelenomethionine70 mcg (3,041)Sodium selenate55 mcg (709)Sodium selenite55 mcg (660)Selenium glycinate55 mcg (463)Selenium yeast75 mcg (351)
Selenium by formSelenomethionine70 mcg (3,041)Sodium selenate55 mcg (709)Sodium selenite55 mcg (660)Selenium glycinate55 mcg (463)Selenium yeast75 mcg (351)

Source: Supplement Facts rows and their forms, NIH ODS Dietary Supplement Label Database version 9.4.0, current labels.

Products
660485 on the market
Median selenium per serving
55 mcgall selenium products: 55 mcg
Share of selenium products
8%660 of 7,934

Is the amount the selenium or the whole sodium selenite?

A Supplement Facts row normally states the selenium itself (a row like "Selenium (as sodium selenite)"); a row named as the compound (a row like "Sodium selenite") usually states the compound's weight, which includes what the selenium is bound to and is larger than the selenium it supplies. The front of a bottle may print either. Of the 660 products here, 657 give the selenium in its own row (15 of them an amount far outside what other labels list, or one their own %DV disagrees with); 1 gives only a row named as the compound, left out of the medians and counts on this site; 2 give no amount of their own or one in another unit.

The adult Tolerable Upper Intake Level for selenium is 400 mcg a day; it covers total intake from food, water and supplements. At the most servings their labels direct, 14 of the 642 sodium selenite products with a plausible amount (2.2%) give more than that.

Source: Supplement Facts rows of each product's current label, NIH ODS Dietary Supplement Label Database version 9.4.0; upper limit: Institute of Medicine Dietary Reference Intakes (2011) (what counts as plausible).

What else do these products contain?

Ingredients most often listed alongside it, with the median amount in these products and in all products
IngredientShare of these productsMedian hereMedian, all products
Zinc90% 11 mg11 mg
Vitamin C87% 125 mg100 mg
Vitamin B680% 4.25 mg6 mg
Vitamin B1277% 25 mcg36 mcg
Vitamin E76% 30 IU30 IU
Folate74% 400 mcg400 mcg
Niacin73% 20 mg20 mg
Vitamin D73% 20 mcg15 mcg
Thiamin72% 2.35 mg5 mg
Vitamin A70% 5,000 IU4,000 IU

Which products are they?

60 of the 660 (on-market products first, the newest label first), ordered by the amount of selenium per serving, largest first; an amount that looks like a slip or a compound's weight comes last, marked.

Source: NIH ODS Dietary Supplement Label Database version 9.4.0; the form each label names for its row. Daily Values: the FDA's Daily Value page.

Which brands make them?

SuperNutrition (33), Source Naturals (27), Life Extension (26), SmartyPants (19), Priority One Nutritional Supplements (17), Allergy Research Group (15), EBOOST (14), DC (14), Trace Minerals (14), Super Nutrition SimplyOne (14).

Where next?