Vitamin B12: 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 905 vitamin B12 labels on the US market, which make up 844 products. Only 33 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.

4 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 B12 is third-party tested?. Third-party testing, additives and form, as printed on the labels of BulkSupplements.com · Vitamin B12 1% Methylcobalamin Powder 20 mg, Nature Made · Vitamin B-12 500 mcg, Superior Source · Activated B-12 2,000 mcg, NOW · Methyl B-12 5,000 mcg, Source Naturals · MethylCobalamin Vitamin B-12 1 mg Cherry Flavored Sublingual.

From every label to the ones that pass

  1. Vitamin B12 products on the US market (NIH) 844
  2. Third-party tested 33
  3. …and none of the additives we check for 30
  4. …and a form an expert we quote prefers 4
The top bar is every vitamin B12 product on the US market that NIH lists, from every brand. Only 33 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 B12?

Start with your blood test. The number to look at is your Vitamin B12.

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

See what your Vitamin B12 result means

Which vitamin B12 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 B12

Methylcobalamin (methylated B12) named as preferred

“…we use methylcobalamin for B12 so you want to make sure you're getting the right”

Brands that make vitamin B12

NIH lists 295 brands that make vitamin B12. 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 B12 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.