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Omega-3

Omega-3 are healthy fats found mainly in oily fish (EPA and DHA). They are needed for your brain and heart and are widely sold as fish oil pills.

Omega-3 at a glance

TriglyceridesLowers themModerate
HeartMixed evidencePreliminary
MemoryNot shown in healthy peoplePreliminary
Best sourceOily fish over pills
132 studies19 answersupdated Nov 2026
All questions and research on omega-3 →Omega-3: news and checked claims in your inbox →
Evidence per claim
Lowers triglycerides in the blood
View evidence →
Moderate
Fish oil pills do not demonstrably keep memory sharp
View evidence →
Moderate
Oily fish fits a brain-friendly diet
View evidence →
Moderate
Part of a healthy, partly plant-based diet
View evidence →
Moderate
Practical use

For whom

People who eat little fish or have raised triglycerides.

Not for whom

If you already eat oily fish twice a week, a pill is usually not needed.

Usual dose

Preferably oily fish twice a week; a supplement (EPA/DHA) only with low fish intake.

Key caveats

Pill quality varies; for the brain in healthy people the effect is not proven.

What we know, and don't

Known

Lowers triglycerides
Oily fish belongs in a healthy pattern
Needed for brain and heart

Not yet

Whether pills truly protect the heart in healthy people
Whether they keep memory sharp
The ideal EPA versus DHA dose
Common misconceptions
"Fish oil pills keep your memory sharp."
Not shown. In healthy people that is not shown.Moderate evidence
"A pill is as good as fish."
Incomplete. Oily fish delivers more than the isolated fatty acids.Moderate evidence
Latest news on omega-3
Fish oil reaches the brain but does not protect memory25 OctOmega-3, healthy gums, stair climbing: what actually helps your heart?29 SepDiet barely changes the burden of aging cells16 Jul41 interventions that lower your biological age27 Jun
Heard on podcasts

What popular health podcasts claimed about omega-3, checked against the research.

Siim LandPartly
“A higher omega-3 index in red blood cells is associated with lower mortality and a lower risk of cardiovascular disease and Alzheimer's disease.”
What the research says →
Thomas DeLauerPartly
“People with very high non-fasting triglyceride levels are more than five times as likely to have a heart attack as people with low levels.”
What the research says →
The Dr. Gundry Podcast · Dr. Steven GundryPartly
“The human body does not have a good enzyme system to efficiently convert alpha-linolenic acid into the long-chain omega-3 fatty acids EPA and DHA.”
What the research says →
Omega-3: what's new, and what holds up

We follow the latest research on omega-3 and listen to leading health podcasts, and we check what they claim. You'll get one email on Thursdays with what matters, and only when there's something new.

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Related topics
Effects
HeartBrain
Related
Triglycerides
Cholesterol