Omega-3 & Fish Oil: Dosing, Forms, and What Actually Works

The average American's omega-6 to omega-3 ratio is approximately 15:1. Our evolutionary ratio was closer to 1:1. This mismatch drives chronic systemic inflammation — the substrate for cardiovascular disease, neurodegeneration, autoimmune conditions, and metabolic syndrome. Correcting it is one of the highest-impact interventions available.

EPA vs DHA: They're Not the Same

Fish oil contains two primary omega-3 fatty acids, and they do different things:

EPA (eicosapentaenoic acid):

• Primary anti-inflammatory omega-3


• Competes with arachidonic acid (omega-6) for inflammatory enzyme pathways


• Best evidence for: cardiovascular risk reduction, depression, inflammatory conditions


• The REDUCE-IT trial showed 25% cardiovascular event reduction with high-dose EPA (4g/day)

DHA (docosahexaenoic acid):

• Structural component of brain tissue (makes up 40% of brain polyunsaturated fats)


• Critical for retinal health and visual acuity


• Best evidence for: cognitive function, brain health, prenatal development


• More important for structural/neurological outcomes than acute inflammation

Bottom line: You need both, but the ratio matters based on your goals. For inflammation and cardiovascular health, prioritize EPA. For brain health and cognition, ensure adequate DHA.

Form Matters More Than You Think

Triglyceride (TG) Form

• Natural form found in fish
• 70% better absorption than ethyl ester form
• More expensive to produce
• Look for: "triglyceride form" or "rTG" on the label

Ethyl Ester (EE) Form

• Cheaper to manufacture
• Most common form in budget fish oils
• Significantly lower bioavailability
• More prone to oxidation

Phospholipid Form (Krill Oil)

• Good absorption due to phospholipid carrier
• Contains astaxanthin (antioxidant)
• Much lower EPA/DHA per capsule (need many more pills)
• Expensive per gram of actual omega-3

Recommendation: Triglyceride form fish oil. Best balance of absorption, dose, and cost.

Therapeutic Dosing

Most fish oil supplements contain 300mg combined EPA/DHA per 1000mg capsule. This is homeopathic relative to therapeutic doses.

General health maintenance: 1-2g combined EPA+DHA daily
Anti-inflammatory protocol: 3-4g combined EPA+DHA daily
Cardiovascular risk reduction: 2-4g EPA+DHA daily (REDUCE-IT used 4g pure EPA)
Depression/mood: 1-2g EPA daily (EPA specifically, not DHA)
Cognitive support: 1-2g DHA daily

This means: For therapeutic dosing, you need a concentrated fish oil. Look for products with 500-800mg EPA+DHA per capsule. Otherwise you're swallowing 10+ pills daily.

Quality: The Oxidation Problem

Oxidized fish oil is worse than no fish oil. Rancid omega-3s generate lipid peroxides that promote the very inflammation you're trying to reduce.

How to check quality:

• Smell/taste test: If your fish oil smells strongly fishy or gives you fish burps, it's likely oxidized


• Totox value: Should be below 26 (measures total oxidation). Reputable brands publish this.


• Storage: Keep in the fridge after opening. Heat and light accelerate oxidation.


• Third-party testing: Look for IFOS, NSF, or ConsumerLab certification

Brands that consistently test well: Nordic Naturals, Carlson, Sports Research, WHC. This isn't an endorsement — it's what the independent testing data shows.

The Omega-3 Index

The omega-3 index measures EPA+DHA as a percentage of red blood cell fatty acids. It's the best biomarker for omega-3 status.

Target: 8-12%
Average American: 4-5% (high-risk zone)
Japanese average: 8-10% (cardioprotective zone)

A meta-analysis of 10 cohort studies found that an omega-3 index of 8%+ was associated with 35% lower risk of fatal coronary heart disease compared to <4%.

How to test: OmegaQuant (finger-prick home test, ~$50). Worth doing at baseline and 3 months after optimizing intake.

Plant-Based Omega-3 (ALA)

Alpha-linolenic acid (ALA) from flax, chia, and walnuts is an omega-3, but it's not EPA or DHA. The conversion rate:

• ALA → EPA: approximately 5-10%


• ALA → DHA: approximately 2-5%

This conversion is inadequate for therapeutic purposes. Vegans and vegetarians should consider algae-based EPA/DHA supplements (the fish get their omega-3 from algae anyway).

Timing and Interactions

• Take with food containing fat. Absorption increases 3x with a fat-containing meal.
• Split doses: If taking 3g+, split into 2 doses (morning and evening with meals).
• Blood thinning: High-dose omega-3 has mild anticoagulant effects. If you're on blood thinners (warfarin, apixaban), discuss with your physician. Most studies show this is clinically insignificant below 4g/day, but monitor INR.
• Surgery: Some surgeons request stopping fish oil 7-10 days pre-surgery. Follow your surgeon's guidance.

The Protocol

• Test: Omega-3 index if possible (know your baseline)
• Choose: Triglyceride form, concentrated (500mg+ EPA/DHA per capsule), third-party tested
• Dose: 2-3g combined EPA/DHA daily for most people. Adjust based on goals.
• Take: With meals. Split if >2g.
• Store: Refrigerate after opening.
• Retest: Omega-3 index at 3 months.

Fix your omega-6:omega-3 ratio and you address one of the foundational drivers of modern chronic disease. The evidence is massive. The cost is minimal. The gap between what most people do (nothing, or 300mg from a cheap capsule) and what actually works (2-3g quality EPA/DHA) is where the health gain lives.