Fish oil: 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 2,578 fish oil labels on the US market, which make up 2,475 products. Only 255 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.

43 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 fish oil is third-party tested?. Third-party testing, additives and form, as printed on the labels of GNC · Triple Strength Fish Oil Mini, Carlson · The Very Finest Fish Oil Natural Lemon Flavor, Nature Made · Krill Oil 500 mg, Nordic Naturals · Omega-3 Lemon, Wonder Laboratories · Mega Omega-3 1360 mg.

From every label to the ones that pass

  1. Fish oil products on the US market (NIH) 2,475
  2. Third-party tested 255
  3. …and none of the additives we check for 255
  4. …and a form an expert we quote prefers 43
The top bar is every fish oil product on the US market that NIH lists, from every brand. Only 255 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 fish oil?

Start with your blood test. The number to look at is your Omega-3 Index.

What was said about that number:

“…we think and what we call the omega-3 index which is EPA plus DHA in red cell membranes our target is 8 to 12 percent just that's a range we think is the healthy range average American is around 5% maybe four or five percent”

Dr. Bill Harris, Ph.D. — co-creator of the Omega-3 Index (guest on Peter Attia's show) Watch at 1:23:04 →

“…he looked at the Omega-3 Index, and people that had a Omega-3 Index of 4% or lower, so close to what the standard American is but a little bit lower, they had a five-year decreased life expectancy compared to people that had an 8% Omega-3 Index.”

“…people that are in the 4% Omega-3 Index range, in order to get to the 8%, the five-year increased life expectancy if we're comparing the two groups, was to supplement with at least two grams.”

See what your Omega-3 Index result means

Which fish oil 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 fish oil

Triglyceride-form fish oil named as preferred

“…omega-3 fatty acids found in triglycerides are more bioavailable than those in ethyl ester form”

Phospholipid-form (krill oil / salmon roe) for brain DHA named as preferred

“…compelling reason that krill oil is superior to fish oil is because krill oil is a great source of DHA phosphatidylcholine the preferred source of DHA for the brain”

Ethyl-ester fish oil spoken against

“…contain the omega-3 fatty acids in their ethyl ester form which is unfortunate because that's less bioavailable than the omega-3 fatty acids found in triglyceride form”

Plant-based ALA (flax, walnuts) as a primary source spoken against

“…the conversion of ALA into EPA, and then subsequently DHA, it's very inefficient”

Brands that make fish oil

NIH lists 536 brands that make fish oil. 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 fish oil 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.