Foundational Health Series
Omega-3 is Foundational
Build Better Cells
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Reboot - Health & Longevity
Supplement Spotlight: Omega-3
Welcome to the next installment in my Foundational Health Series.
The first instalment of the series featured creatine, which you can read here.
This week it’s omega-3 fatty acids.
These Supplement Spotlights are not intended to be exhaustive scientific reviews. The goal is to provide a practical, high-level reference guide for the benefits, risks, dosage, sources, and quality considerations of supplements I consider foundational.
Omega-3s have been part of the health and longevity conversation for decades, which means there is no shortage of research, opinion, and conflicting headlines. This issue is meant to cover the key points without getting lost in the (sea)weeds.
I am not a doctor. This is not medical advice. It is a practical overview of what I do, what I have learned, and how I think about this supplement.
Why They Matter
For decades, omega-3s have been associated with fish oil, heart health, and the advice to eat more fatty fish like salmon.
That advice holds true, but on its own it’s incomplete.
Omega-3s are not just “healthy fats.” They are structural fats. They become part of your cell membranes. They influence inflammation, cardiovascular function, brain health, mood, recovery, and possibly how well your body responds to training stress.
They also sit in that frustrating category of supplements where the public conversation swings wildly between “everyone should take this” and “new study says it might be dangerous.”
The truth is more useful.
Omega-3s are not magic. They are not an acute performance booster. They are not something you take once in a while and expect to feel immediately.
They are a background, and foundational, nutritional strategy.
They become part of the structure of your cells. They help shape the signaling environment inside your body. They influence how your body responds to stress, inflammation, training, tissue damage, and recovery.
Related to the omega-3 conversation is the online debate around omega-6 fats, inflammation, and seed oils.
Real biology is more complicated.
One of the clearest ways to understand omega-3 comes from Dr. Bill Harris, one of the leading researchers in the field. His view is simple: the problem is not that omega-6 fats are evil. The more practical issue is that most people do not get enough EPA and DHA. Rather than obsessing over ratios, the better starting point is to improve omega-3 status.
Omega-6 fats are not inherently bad. The bigger issue is that many people consume very little EPA and DHA by comparison.
Inflammation is also not inherently bad. You need inflammatory signaling to heal, adapt, and defend yourself.
The problem is not that your body has inflammatory pathways.
The problem is when the system is poorly supplied, poorly regulated, and chronically out of balance.
Omega-3s help improve the terrain and maintain balance.
What Are Omega-3s?
Omega-3s are a family of essential polyunsaturated fats.
The three main types are:
- Alpha-linolenic acid (ALA), found mostly in plant foods like flaxseed, chia seeds and walnuts
- Eicosapentaenoic acid (EPA), found mostly in fatty fish and fish oil
- Docosahexaenoic acid (DHA), also found mostly in fatty fish and fish oil
ALA is technically essential, meaning your body cannot make enough of it on its own. But EPA and DHA are the forms most strongly associated with the benefits of omega-3s.
Why the Focus on EPA and DHA?
EPA is often discussed for inflammation, cardiovascular health and mood.
DHA is especially important for the brain, eyes, nervous system and cell membrane structure.
Every cell in your body has a membrane.
That membrane is not just a wall. It is an active, dynamic structure. It helps determine how cells communicate, how receptors function, how nutrients move, how signals are interpreted, and how flexible or rigid the cell environment becomes.
EPA and DHA get incorporated into those membranes.
Omega-3s are not working because they temporarily “boost” something. They work because, over time, they change the raw materials available to your body.
When EPA and DHA levels are higher, the body has more substrate to produce signaling molecules involved in inflammatory balance and resolution.
When levels are low, that system has less to work with.
That is why consistency matters.
Dietary Sources
The best food sources of EPA and DHA are fatty, cold-water fish.
Good options include:
- Salmon
- Sardines
- Anchovies
- Herring
- Mackerel
- Trout
- Oysters
- Mussels
The general food-first recommendation is to eat fatty fish 2-3 times per week.
That is a solid baseline.
The challenge is consistency.
Most people do not eat enough fatty fish. And even when they do, intake can vary depending on the type of fish, serving size, sourcing, preparation, and frequency.
There is also the mercury question.
As a general rule, smaller fatty fish tend to be a better regular option. Sardines, anchovies, herring and salmon are usually easier to fit into a lower-mercury approach than large predatory fish.
For people who prefer to get nutrients from food, it is possible to get meaningful omega-3 intake from fish.
For many people, however, supplementation is the more practical route.
That is where I land.
I still eat fatty fish, but I do not rely on it as my only omega-3 source. I want a consistent supply so I supplement daily.
Supplemental Sources
Omega-3 supplements typically come from:
- Fish oil
- Krill oil
- Algal oil
- Cod liver oil
For most people, a high-quality fish oil is the most common and practical option.
Algal oil can be a good option for people who avoid fish or prefer a plant-based source of DHA and EPA.
The key is not the total amount of oil.
The key is the amount of EPA and DHA.
A bottle might say 1,000 mg of fish oil on the front label, but only contain 180 mg of EPA and 120 mg of DHA.
That is a very different product than one providing 1,000 mg or more of combined EPA and DHA per serving.
Always read the label.
I don’t think most people need to obsess over the perfect EPA-to-DHA ratio. Especially with fish oil as you get both. Some specific goals, such as mood support or triglyceride lowering, may call for a more EPA-heavy approach. But for general foundational health, I prefer getting both.
Evidence-Based Benefits
Omega-3s have been studied across a wide range of health outcomes.
Not every claim is equally strong.
But the broad case is compelling.
The most important benefits are not isolated. They overlap.
Heart health influences brain health.
Inflammation influences recovery.
Cell membrane function influences metabolic function.
Muscle preservation influences longevity.
This is why I think of omega-3 less as a single-outcome supplement and more as a foundational support nutrient.
1. Cardiovascular Health
This is the classic omega-3 category.
EPA and DHA have been studied for triglycerides, blood pressure, vascular function, inflammation, platelet function, heart rhythm and overall cardiovascular risk.
The clearest effect is triglyceride reduction, especially at higher doses. This is why prescription omega-3 therapies are sometimes used medically for people with elevated triglycerides.
But triglycerides are only one part of the story.
Omega-3s may also support cardiovascular health through several other pathways:
- Better inflammatory balance
- Improved endothelial function
- Reduced platelet aggregation
- Improved heart rate variability
- Effects on cell membrane fluidity
- Potential reductions in certain cardiovascular events in higher-risk groups
That does not mean fish oil is a complete cardiovascular strategy.
It is not a substitute for exercise, sleep, blood pressure control, lipid management, maintaining a healthy body composition, limiting alcohol or not smoking.
But it can be a useful part of the broader system.
2. Brain Health, Cognitive Function and Dementia Risk
This is one of the more interesting areas.
It is also one of the easiest to overstate.
DHA is highly concentrated in the brain and retina. That alone does not prove that taking DHA prevents dementia, but it does make DHA biologically relevant to brain structure and function.
The brain is rich in fat. Neuronal membranes depend on fatty acids.
DHA helps support membrane fluidity, synaptic function, neuroplasticity and communication between brain cells.
EPA appears to act more through inflammatory signaling, vascular pathways and mood-related mechanisms.
The research is mixed, but not dismissible.
Prospective studies and meta-analyses suggest that higher fish or omega-3 intake is associated with lower risk of mild cognitive decline, dementia and Alzheimer’s disease. But the timing seems important.
Omega-3s appear more promising for prevention, early cognitive decline, mild cognitive impairment, or people with higher risk, rather than as a treatment for established Alzheimer’s disease.
Once neurodegeneration is advanced, changing one nutrient input is unlikely to reverse a complex disease process.
But earlier in the curve, when the goal is to support brain structure, vascular health, inflammatory balance, and synaptic resilience, omega-3s may be more useful.
This fits the broader theme of Medicine 3.0, as coined by Dr. Peter Attia, and proactive health.
Do not wait for the system to break before giving it better inputs.
3. Mood and Emotional Health
Omega-3s, particularly EPA-rich formulations, have been studied as an adjunctive tool for depression and mood support.
This does not mean omega-3s are a replacement for therapy, medication, proper diagnosis, or professional care.
But there is enough evidence to suggest EPA-rich omega-3 supplementation may be helpful for some people, especially when used alongside proper medical and lifestyle support.
The mechanism is probably not one thing. It may involve inflammatory signaling, neurotransmitter systems, cell membrane function, and vascular effects in the brain.
This is another example of why foundational supplements are not magic switches.
They help create a better biological environment.
4. Inflammation Resolution
Inflammation is often talked about as if it is the enemy.
You need inflammation to heal. You need it to respond to stress, infection, injury and training. The problem is not inflammation itself.
The problem is unresolved or chronic inflammation.
EPA and DHA can be converted into specialized pro-resolving mediators. These are signaling molecules involved in helping the body resolve inflammatory responses.
That is different from simply blocking inflammation.
You do not want to shut down every inflammatory signal. You want the right response, at the right time, followed by proper resolution.
Omega-3s do not just “reduce inflammation” in some vague supplement-marketing sense.
They help support the body’s ability to regulate and resolve it.
5. Exercise Recovery
Omega-3s are not usually thought of as a training supplement.
They probably should be, but not in the way people typically think.
They are not going to make you feel less sore tomorrow because you took fish oil today.
The better way to think about them is as a recovery-support nutrient.
A recent study discussed by Dr. Rhonda Patrick looked at omega-3 supplementation and recovery after muscle-damaging exercise. Participants took omega-3s daily for eight weeks before the exercise challenge.
The result was interesting. They did not feel less sore. But they lost less strength after the damaging exercise.
The study suggested that omega-3s may help shift the body toward a more favorable recovery profile by influencing oxylipins, which are lipid-derived signaling molecules involved in inflammation and repair.
6. Muscle, Aging and Resilience
This is an emerging area, but it is worth watching.
As we age, preserving muscle becomes one of the most important health priorities.
Muscle is not just about strength or appearance. It is central to glucose regulation, mobility, independence, injury prevention and longevity.
Some research suggests omega-3s may support muscle protein sensitivity, reduce catabolic signaling, and improve aspects of recovery or adaptation when paired with training.
The evidence is not as strong as it is for creatine.
But the direction is interesting.
And when you step back, it makes sense.
If omega-3s improve cell membrane composition, inflammatory resolution, mitochondrial membrane dynamics and recovery signaling, they may help create a better environment for maintaining muscle over time.
It does not replace resistance training.
No supplement replaces the basics. But the right supplements can support the basics.
Dosage
This is where it often gets confusing.
There is the amount of fish oil.
Then there is the amount of EPA and the amount of DHA.
The EPA and DHA number is what matters most.
As mentioned, the general food-based recommendation is 2-3 servings of fatty fish per week.
For supplementation, a practical range often discussed by physicians and researchers is roughly in the range of 1 to 2 grams per day of combined EPA and DHA for general health support.
Some protocols go higher.
Exercise recovery studies often use around 2 to 3 grams or more per day of combined EPA and DHA for several weeks or months.
Higher doses, such as 4 grams per day, are often used in medical contexts, particularly for triglyceride lowering. That is a different category and should be treated as such.
More is not always better.
For most people, the goal is not to megadose.
The goal is to consistently avoid being low.
Timing
Timing is not critical. This is not a supplement where you need to optimize the timing window.
Consistency matters more. Just take it consistently.
Taking fish oil with food may improve absorption and reduce the chance of “fish burps” or stomach discomfort.
What to Look For in a Supplement
Quality is key with omega-3s.
Fish oil can oxidize. Labels can be misleading. Lower-quality products may provide much less EPA and DHA than you think, or may have weaker testing for oxidation, heavy metals, and other impurities.
Here is what I look for:
1. EPA and DHA clearly listed
Ignore the front-label grams of fish oil per serving number until you know the EPA and DHA content.
You want to know how much active omega-3 you are actually getting.
2. Third-party testing
Look for brands that test for purity, potency, oxidation and contaminants.
This is especially important with fish oil because quality can vary.
3. Heavy metal screening
High-quality fish oil should be purified and tested for contaminants like mercury, PCBs and dioxins.
Reputable brands use molecular distillation or similar purification processes.
4. Freshness
Fish oil should not smell rancid.
Liquid fish oil should be refrigerated after opening. Capsules should be kept away from heat and light (I refrigerate these too).
If it smells or tastes aggressively off, pitch it.
5. Practical serving size
Some products require six capsules to hit a meaningful EPA/DHA dose.
That may be fine, but it is not practical for everyone.
Choose something you will actually take.
My Protocol
The brand I use is Carlson’s liquid fish oil, lemon flavour (I order from Amazon)
1 tsp serving provides approximately:
- 5 ml containing 4.6 grams of fish oil
- 800 mg EPA
- 500 mg DHA
- 1.3 grams combined EPA and DHA
I have been taking 1 teaspoon daily with food for years. But after refreshing my knowledge on recent studies while writing this issue, I am doubling that to 2 teaspoons daily (divided doses) for 2.6 grams of combined EPA and DHA.
That is my personal protocol, not a blanket recommendation. For many people, 1 to 2 grams per day of combined EPA and DHA may be a reasonable practical range.
For traveling, I take capsules with me for convenience: Carlson's Super Omega-3
Whether or not I eat fatty fish during the week, I still take it daily. For me, the potential benefits are too compelling, the safety profile at moderate doses is strong, and the consistency of daily supplementation is easier than relying on diet alone.
What About Testing?
There is a test called the Omega-3 Index, which measures EPA and DHA in red blood cell membranes.
Dr. Bill Harris has been one of the leading voices behind this concept. His preferred target is often described as roughly 8% to 12%.
While I am a proponent of testing and measuring various markers, I do not currently do this one. I just don't think testing is necessary for the average person.
The more practical starting point is simple:
Eat fatty fish regularly or take a high-quality omega-3 supplement consistently. Or both.
If someone is more data-driven, has cardiovascular concerns, or wants to personalize their dose, testing may be useful.
But you do not need to turn every health behavior into a lab project before taking a reasonable first step.
Safety Profile
Omega-3s have a strong safety profile when used appropriately.
The most common side effects are mild:
- Fishy aftertaste
- Bad breath
- Stomach discomfort
These are often reduced by taking fish oil with food, lowering the dose, switching brands, or using a higher-quality product.
Fishy aftertaste or “fish burps” are more common with capsules. I have experienced this with some brands, but not with Carlson's.
More importantly, speak with a doctor before supplementing if you have a health condition you are concerned may be impacted by omega-3s, especially if you:
- Take blood thinners
- Have a bleeding disorder
- Have a history of atrial fibrillation or arrhythmia
- Are preparing for surgery
- Have a fish or shellfish allergy
- Are pregnant, breastfeeding, or choosing supplements for a child
- Are considering high-dose omega-3 supplementation
What About the Scary Headlines?
Every few months, a new supplement headline appears. Two of the recent ones are:
“Fish oil causes atrial fibrillation.”
“Omega-3s speed up cognitive decline.”
Most of these headlines are designed to create clicks, not clarity.
That does not mean safety signals should be ignored.
It means they should be interpreted properly.
Myth 1: Omega-3s cause atrial fibrillation
The AFib concern is not completely fabricated, but it is often overstated.
A recent analysis discussed by Dr. Rhonda Patrick helps clarify the issue.
Some randomized trials, using high-dose omega-3s, often around 4 grams per day in higher-risk cardiovascular populations, found a small increase in atrial fibrillation risk.
But that is not the same as saying moderate-dose fish oil causes AFib in healthy people.
Another headline-making observational study relied on self-reported fish oil use rather than actual omega-3 blood levels. People who take fish oil may be older, more health-conscious, or already dealing with cardiovascular concerns. Older adults are also more likely to develop AFib, which can make supplement use look riskier if age and baseline risk are not handled properly.
A newer analysis using blood omega-3 levels rather than just self-reported supplement use found that higher omega-3 status was associated with lower AFib risk.
The practical takeaway: Moderate intake appears reasonable for most people.
A personal note: I went through a period where I was experiencing AFib somewhat regularly. It's hard to pinpoint the cause. I never stopped taking omega-3, nor was it recommended that I do by doctors. I made other lifestyle adjustments that resolved the issue. Hint: sleep and stress management (emotional well being) are critical, which is whey they are in my top 6 domains for healthy and longevity.
Myth 2: Omega-3s speed up cognitive decline
This is another example where the headline is stronger than the evidence.
A recent observational study suggested omega-3 supplement users experienced faster cognitive decline.
But it does not prove that omega-3s caused the decline.
This was not a randomized trial where one group was assigned fish oil and another group was assigned placebo. It was an observational analysis of what people were already doing.
One plausible explanation is reverse causation.
People may start taking fish oil because they already have cardiovascular concerns, memory concerns, or early signs of decline. In that case, the supplement is not causing the problem. It is showing up after the problem has already started.
The broader brain-health literature is more nuanced.
Some studies suggest omega-3 intake may be associated with lower risk of cognitive decline, mild cognitive impairment and Alzheimer’s disease. Some DHA trials in people with mild cognitive impairment have shown benefit. Trials in people with established Alzheimer’s disease have been less convincing.
That is not a reason to claim omega-3 prevents dementia.
It is also not a reason to claim omega-3 damages the brain.
The better conclusion is this:
Omega-3s may be more useful as part of a long-term brain-health strategy than as a late-stage treatment.
Final Word
Omega-3s are not a flashy supplement.
You will not feel it working.
That does not mean it is not working.
It works in the background.
They support the structure of your cells. They influence the inflammatory environment. They may support cardiovascular health, brain function, mood, recovery and muscle resilience.
Not as a hack.
As a foundation.
Readers Corner
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Until next week,
Kevin
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