Omega-3
Omega-3 Fatty Acids (EPA/DHA)
Omega-3 fatty acids, primarily eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), are long-chain polyunsaturated fats derived from marine sources (fish oil, krill oil) or algae. They are widely used to support cardiovascular health, reduce triglycerides, manage inflammation, and support brain and eye function. At pharmaceutical-grade doses (4g/day EPA/DHA), they are FDA-approved (as Vascepa/icosapentaenoic acid) for reducing elevated triglycerides.
Mechanism of Action
EPA and DHA are incorporated into cell membrane phospholipids, altering membrane fluidity and displacing arachidonic acid, thereby reducing the production of pro-inflammatory eicosanoids (prostaglandins, thromboxanes, leukotrienes) derived from the omega-6 pathway. They also act as ligands for GPR120 and PPARγ receptors, promoting anti-inflammatory gene expression and improving insulin sensitivity. DHA is a structural component of neuronal membranes and photoreceptors, supporting synaptic plasticity and visual function.
Evidence by Health Goal(18 goals)
Dosing Protocols
With meals containing fat to enhance absorption and minimize GI side effects
General cardiovascular and anti-inflammatory support typically uses 1–2g EPA+DHA/day. Triglyceride reduction requires 3–4g EPA+DHA/day under medical supervision. Check supplement labels carefully — total fish oil capsule weight is not equivalent to EPA+DHA content. Algae-based omega-3 is suitable for vegetarians and avoids heavy metal concerns associated with some fish oils.
Safety & Side Effects
Omega-3 fatty acids have an excellent long-term safety profile at standard doses (1–3g EPA+DHA/day) and are well-tolerated by most adults, including during pregnancy when sourced from low-contaminant products. At doses of 3g/day or higher, clinically meaningful anticoagulant effects are possible and caution is warranted in patients on anticoagulant or antiplatelet therapy or prior to surgery.
Possible Side Effects
- !Fishy aftertaste and fish breath, especially with low-quality or non-enteric-coated products
- !Gastrointestinal discomfort including nausea, bloating, and loose stools at doses above 3g/day
- !Increased LDL cholesterol observed with some high-dose fish oil formulations (less common with pure EPA products)
- !Mild anticoagulant effect leading to increased bruising or prolonged bleeding time at high doses
- !Gastrointestinal reflux or burping, mitigated by enteric-coated formulations or freezing capsules
- !Rare hypersensitivity reactions in individuals with fish or shellfish allergies
- !Elevated blood glucose reported in some diabetic patients at very high doses (above 4g/day)
Interactions
- -May enhance the anticoagulant effect of warfarin, heparin, and direct oral anticoagulants (DOACs) — monitor INR and bleeding risk at doses above 2g/day
- -Additive antiplatelet effects when combined with aspirin, clopidogrel, or NSAIDs — use with caution and inform prescribers
- -May have additive blood pressure-lowering effects when combined with antihypertensive medications — monitor blood pressure
- -Can potentiate the triglyceride-lowering effects of fibrates (e.g., fenofibrate) or niacin — generally beneficial but warrants monitoring
- -High-dose omega-3 may modestly reduce cyclosporine levels in transplant patients — avoid unmonitored use in this population
Cost & Where to Buy
Budget fish oil capsules (1g total oil, ~300mg EPA+DHA) cost as little as $10–15/month; achieving 2g EPA+DHA/day with these requires multiple capsules. High-concentration pharmaceutical-grade or triglyceride-form fish oils (e.g., Nordic Naturals, Carlson, Thorne) providing 1–2g EPA+DHA per capsule range from $25–60/month. Prescription icosapentaenoic acid (Vascepa) can cost $300+/month without insurance.
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