Vitamin D: 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 1,806 vitamin D labels on the US market, which make up 1,745 products. Only 67 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.

62 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 vitamin D is third-party tested?. Third-party testing, additives and form, as printed on the labels of Nature Made · D3 1000 IU (25 mcg), Carlson · Vitamin D3 50 mcg (2,000 IU) & K2 90 mcg, Bluebonnet · Vitamin D3 50 mcg (2000 IU), Bariatric Advantage · Calcium Citrate Chewy Bite 500 mg Calcium 500 IU Vitamin D3 Coconut, Source Naturals · Vitamin D-3 5,000 IU.

From every label to the ones that pass

  1. Vitamin D products on the US market (NIH) 1,745
  2. Third-party tested 67
  3. …and none of the additives we check for 66
  4. …and a form an expert we quote prefers 62
The top bar is every vitamin D product on the US market that NIH lists, from every brand. Only 67 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 vitamin D?

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

What was said about that number:

“Most people can take a supplement in the range of 2,000 to 4,000 IUs a day depending where your blood levels are at and keep keep their vitamin D levels within that, you know, 40 to 60 range.”

“And you want to have your 25 hydroxy vitamin D levels between you know 30 to 60 nanogs per milliliter is a great I would say level to have your vitamin D levels.”

“You don't really want to go above 80 nanogs per milliliter. Then you start getting into a pretty high range.”

“…but deficiency is considered at levels below 20 nanograms per milliliter”

“…vitamin D 4000 fish oil one or two grams of the actual”

See what your Vitamin D result means

Which vitamin D products pass all three checks?

Third-party tested, none of the additives we check for, and a form an expert we quote prefers. Sizes of one product are shown once.

Compare up to five brands side by side

What was said about each form of vitamin D

D3 (cholecalciferol) named as preferred

“…it should be vitamin D3 which is the active form not vitamin D2”

D2 (ergocalciferol) spoken against

“…it should be vitamin D3 which is the active form not vitamin D2”

Brands that make vitamin D

NIH lists 494 brands that make vitamin D. 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 vitamin D 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.