Selenium: do you need it, and which one?

Checked 25 October 2026 · labels from NIH's public label database, January 2026 release

The short answer

NIH lists 242 selenium labels on the US market, which make up 237 products. Only 4 of those products are third-party tested: an outside lab's seal on the label, or the product's name on that lab's own list.

0 of them pass all three checks: third-party tested, none of the additives we check for, and a form an expert we quote prefers.

Source: NIH's public label database, 11 January 2026 release; checks by Decode, 25 October 2026

Which selenium is third-party tested?. Third-party testing, additives and form, as printed on the labels of Douglas Laboratories · Seleno-Methionine, Wonder Laboratories · Selenium 50 mcg, Solgar · Selenium 200 mcg, Source Naturals · Selenium 200 mcg, The Vitamin Shoppe · Selenium 200 mcg.

From every label to the ones that pass

  1. Selenium products on the US market (NIH) 237
  2. Third-party tested 4
  3. …and none of the additives we check for 4
  4. …and a form an expert we quote prefers 0
The top bar is every selenium product on the US market that NIH lists, from every brand. Only 4 of those products are third-party tested.

Source: NIH's public label database, 11 January 2026 release; checks by Decode, 25 October 2026

Do you need selenium?

Start with your blood test. The number to look at is your Selenium.

No one we quote has put a number on this result.

See what your Selenium result means

Which selenium products pass all three checks?

No label here passes all three checks.

Compare up to five brands side by side

What was said about each form of selenium

Brazil nuts (food source) named as preferred

“Brazil nuts are the heavyweight champion of foods to get selenium from”

Brands that make selenium

NIH lists 130 brands that make selenium. This list shows each brand with a third-party tested product, plus each brand with its own page here.

Source: NIH's public label database, 11 January 2026 release; checks by Decode, 25 October 2026

Common questions

What counts as third-party tested?

A seal from an outside lab that tests what is inside, such as USP Verified or NSF Certified for Sport, or the product's name on that lab's own list, such as IFOS for fish oil. A badge about sourcing, diet or the factory does not count, because it does not test what is inside.

Does no seal mean a product failed a test?

No. It means the label shows no third-party test, and no testing lab's list we read (BSCG, IFOS, IGEN, IKOS, Informed Choice, Informed Sport) names the product. A brand can test privately. This page shows what the label and the lists show.

Which selenium should I take?

That depends on your blood test. This page shows the label checks anyone can see.

Where does the label data come from?

The NIH Dietary Supplement Label Database, which is public domain. We read the file dated 11 January 2026. Brands change labels, so check the one you have.

Our method

Third-party tested
A seal from an outside lab that tests what is inside, printed on the label, or the product's name on that lab's own list.
Additives
Each other ingredient on the label, checked for artificial coloring, titanium dioxide, hydrogenated oil and BHA/BHT preservative, after a physician spoke against dyes, fillers and preservatives on video.

“…that are at the right Doses and that are effective and that don't have a lot of additives and fillers and preservatives and chemicals and dyes”

Form
The form printed on the label. When an expert we quote has talked about that form, the speech bubble next to it says where they stand. Open it to see what they said.
One product, many labels
Label versions that share a UPC count as one product. The newest label is the one shown.
Dose
The amount is shown as printed. Whether it suits you depends on your blood test.