Supplement Comparison
Fish Oil vs Krill Oil: Which Omega-3 Source Is Better?
We analyzed what 5 longevity experts — Huberman, Attia, Patrick, Johnson, and Hyman — actually say about fish oil vs krill oil. Here is where they agree and where they don't.
Universal Consensus
on Omega-3 overall
TL;DR — Fish oil for most people, Krill oil for brain-focused supplementation
Fish oil is the default recommendation for most people (high EPA, affordable, well-studied). Krill oil or salmon roe is superior specifically for brain DHA delivery — but most experts still take fish oil.
What Each Expert Actually Takes
Fish oil (high-EPA)
Recommends 1.5-3g EPA daily for brain health and mood. Focuses on EPA specifically rather than DHA delivery form. Takes fish oil as part of his foundational supplement stack.
Fish oil (high-EPA, triglyceride form)
Personally takes high-EPA fish oil targeting a 12% omega-3 index. Has a dedicated episode with Dr. Bill Harris on omega-3 fatty acids. Focuses on EPA for cardiovascular risk reduction.
Krill oil or salmon roe preferred for brain DHA
Most comprehensive omega-3 source. Says the brain uses MFSD2A transporter to uptake DHA in phospholipid form — found in krill oil and salmon roe but NOT standard fish oil. Salmon roe has 40-70% phospholipid-form omega-3s vs 1-3% in standard fish.
Food sources (flax, walnuts)
Obtains omega-3s primarily through food in his Blueprint diet — Nutty Pudding, flax, and walnuts. Recommends omega-3 supplementation for women during menopause and pregnancy.
Fish oil (general recommendation)
Lists omega-3 as one of the foundational supplements everyone needs. Recommends fish oil supplementation as part of nearly every protocol he shares, from metabolic disease to mental health.
Key Differences
DHA Brain Delivery
Fish Oil
DHA in triglyceride form — less efficient at crossing blood-brain barrier
Krill Oil
DHA in phospholipid form — uses MFSD2A transporter for superior brain uptake (Patrick)
EPA Content
Fish Oil
High — can get concentrated EPA formulations (1-4g per serving)
Krill Oil
Lower EPA per serving — typically 50-100mg EPA
Bioavailability
Fish Oil
Good in triglyceride form (avoid ethyl ester)
Krill Oil
Higher overall bioavailability — phospholipid binding aids absorption (Patrick)
Best For
Fish Oil
Cardiovascular health, inflammation, mood (EPA-focused)
Krill Oil
Brain health, cognitive function, DHA delivery (Patrick)
Cost
Fish Oil
$15-30/month for quality product
Krill Oil
$30-60/month — significantly more expensive
Research Base
Fish Oil
Extensive — REDUCE-IT trial (4g EPA), hundreds of studies
Krill Oil
Growing — strong mechanistic data on MFSD2A transporter
What the Experts Said (Direct Quotes)
"Brain health relies on structural fats, specifically omega-3 fatty acids (EPA/DHA), phosphatidylserine, and choline, which are essential for neuron membrane integrity and neurotransmitter function."
Nutrients For Brain Health & Performance | Huberman Lab Podcast #42 at 10:06
"Key nutrients like EPA (1.5-3g/day), phosphatidylserine (300mg/day), choline (500mg-1g/day), and creatine (5g/day) support cognitive function and can be obtained through fish, eggs, and specific plant-based sources."
Nutrients For Brain Health & Performance | Huberman Lab Podcast #42 at 14:15
"The REDUCE-IT trial demonstrated that 4 grams of pure EPA significantly reduced cardiovascular events in high-risk patients."
#83 — Bill Harris, Ph.D.: Omega-3 fatty acids at 22:47
"Dr. Harris discusses the Omega-3 Index as a clinical metric, the variability in individual responses to supplementation, and the importance of testing red blood cell levels."
#83 — Bill Harris, Ph.D.: Omega-3 fatty acids at 38:21
"A recent meta-analysis of 17 studies links higher blood levels of EPA and DHA to a significantly lower risk of premature death and death from cardiovascular disease."
Omega-3 may reduce risk of premature death at 01:34
"Specialized pro-resolving mediators (SPMs) are byproducts of omega-3 metabolism. These SPMs play a crucial role in managing inflammation by promoting apoptosis and reducing pro-inflammatory molecules."
Omega-3 may reduce risk of premature death at 02:39
"The 11 AM meal is Nutty Pudding, containing protein, cocoa, pomegranate, grape seed extract, and omega-3s, with added olive oil."
I Designed the Perfect Anti-Aging Diet ($16/day) at 02:57
"A breakdown of the nutrient-dense ingredients, including Ceylon cinnamon for blood sugar, flax and walnuts for omega-3s, sunflower lecithin, and various berries and nuts for antioxidants and heart health."
How to Make My Anti-Aging Dessert (Live to 120+) at 00:32
"The most prevalent deficiencies include iron, vitamin D, magnesium, and omega-3s — these are the big ones."
My Favorite Supplements for Optimal Health & Longevity | Dr. Mark Hyman at 01:38
"Foundational supplements recommended for most individuals include a multivitamin/mineral, vitamin D3, magnesium, omega-3 fats, and probiotics."
My Favorite Supplements for Optimal Health & Longevity | Dr. Mark Hyman at 06:45
Bottom Line
Most experts (Huberman, Attia, Hyman) take standard high-EPA fish oil — it is well-studied, affordable, and delivers the EPA needed for cardiovascular and mood benefits. Patrick makes the strongest case for krill oil (or salmon roe), arguing that the brain specifically needs DHA in phospholipid form, which standard fish oil does not provide. If your primary goal is cardiovascular health and inflammation, fish oil is the clear choice. If brain health is your priority, Patrick's data on the MFSD2A transporter is compelling. The ideal approach may be both: fish oil for EPA and krill/salmon roe for brain DHA. Either way, test your omega-3 index and target 8-12%.
Consensus Protocol — Omega-3
Dosage
1-3g combined EPA/DHA daily. Huberman: 1.5-3g EPA for brain health. Attia: high-EPA fish oil targeting 12% omega-3 index. Patrick: ~2g EPA/DHA. For cardiovascular risk reduction in high-risk patients: 4g pure EPA (prescription-strength, per REDUCE-IT trial).
Form
Triglyceride-form fish oil for general supplementation. Krill oil or salmon roe for superior brain DHA delivery (phospholipid-bound DHA crosses the blood-brain barrier more effectively via MFSD2A transporter). Algal oil as a vegan alternative for EPA/DHA. Avoid ethyl ester forms — lower bioavailability than triglyceride or phospholipid forms.
Timing
Take with a fat-containing meal to improve absorption. No specific time-of-day requirement. Consistency matters more than timing.
Notes
Test your omega-3 index — target 8-12% of red blood cell membranes (Attia, Patrick, Dr. Bill Harris). Plant-based ALA (flax, walnuts, chia) converts very inefficiently to EPA/DHA — do not rely on these as primary omega-3 sources. High omega-6 intake competes with omega-3 conversion. Individual responses to supplementation vary significantly — testing is the only way to confirm adequate levels.
Now you know which form. Get the full protocol.
Exact dosages — what each expert recommends, not just which form
Daily schedule — morning vs evening, what to pair with food, what to separate
Expert watchdog — get alerted when an expert changes their recommendation
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