EPA (Eicosapentaenoic Acid) Calculators

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Eicosapentaenoic acid (EPA) is a long-chain polyunsaturated omega-3 fatty acid with 20 carbons and 5 double bonds (20:5n-3). Along with DHA (docosahexaenoic acid), EPA is the primary bioactive omega-3 fatty acid in the body, predominantly found in marine sources. EPA is a precursor to anti-inflammatory eicosanoids (prostaglandins of the 3-series, leukotrienes of the 5-series) and plays key roles in cardiovascular health, inflammation resolution, and mental health. The body can convert alpha-linolenic acid (ALA) from plant sources to EPA, but conversion is inefficient (<10%).

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EPA Structure and Sources

EPA: 20:5(n-3) — 20 carbons; 5 double bonds; all cis configuration; first double bond at the 3rd carbon from the methyl end. Primary dietary sources:

  • Fatty fish: salmon (1.3 g/100g), mackerel (1.6 g/100g), sardines (1.1 g/100g), herring (1.0 g/100g)
  • Fish oil supplements (EPA+DHA concentrated)
  • Algae oil (vegetarian source — algae is the primary synthesizer; fish accumulate EPA from eating algae)
  • Krill oil

Biological Functions

  • Anti-inflammatory eicosanoids: EPA competes with arachidonic acid (AA, omega-6) for cyclooxygenase and lipoxygenase enzymes, producing less inflammatory prostaglandins (PGE3) and leukotrienes (LTB5) vs. the more inflammatory AA-derived eicosanoids
  • Cardiovascular: Reduces triglycerides (high-dose EPA prescription, Vascepa); reduces platelet aggregation; mild blood pressure lowering
  • Resolution of inflammation: Precursor to E-series resolvins — specialized pro-resolving mediators that actively resolve inflammation

Dietary Recommendations

No official RDA established. General guidance: 250–500 mg/day EPA+DHA for healthy adults. Therapeutic doses for triglyceride lowering: 2–4 g/day EPA+DHA (prescription grade). AHA recommends 1 g/day EPA+DHA for patients with cardiovascular disease.

Glossary

EPA (Eicosapentaenoic Acid)
A 20-carbon, 5-double bond omega-3 fatty acid (20:5n-3); found in fatty fish and fish oil; precursor to anti-inflammatory eicosanoids; reduces triglycerides at therapeutic doses.
Omega-3 Fatty Acid
Polyunsaturated fatty acid with first double bond at the 3rd carbon from the methyl end; key types: ALA (plant, 18:3), EPA (marine, 20:5), DHA (marine, 22:6); anti-inflammatory and cardioprotective.
Eicosanoids
Bioactive lipid signaling molecules derived from 20-carbon fatty acids (EPA or arachidonic acid) by cyclooxygenase and lipoxygenase enzymes; include prostaglandins, thromboxanes, and leukotrienes.

Frequently Asked Questions

EPA (eicosapentaenoic acid, 20:5n-3) is an omega-3 fatty acid found primarily in fatty fish and fish oil. Key health benefits: (1) Reduces blood triglycerides — high-dose EPA (4 g/day as Vascepa) is FDA-approved for severe hypertriglyceridemia and reduces cardiovascular events. (2) Anti-inflammatory — EPA-derived eicosanoids are less inflammatory than omega-6-derived equivalents; EPA competes with arachidonic acid for inflammatory enzyme pathways. (3) Modest blood pressure reduction. (4) Reduced platelet aggregation (anti-thrombotic). Evidence for depression and cognitive benefits is promising but less conclusive.

Both are long-chain omega-3 fatty acids: EPA = 20:5(n-3); DHA = 22:6(n-3). EPA is more potent for anti-inflammatory effects and triglyceride lowering. DHA is the primary structural lipid in the brain (60% of brain fatty acids) and retina — critical for neural development and cognitive function. DHA can be retro-converted to EPA in limited amounts. For cardiovascular/inflammatory conditions: EPA-focused supplements. For brain development (pregnancy, infancy, aging): DHA is critical. Fish oil typically provides a mixture; algae oil can provide DHA specifically; Vascepa provides pure EPA.

No official RDA for EPA exists. Recommendations: healthy adults should aim for 250–500 mg/day combined EPA+DHA from diet and/or supplements — achievable by eating 2 servings of fatty fish per week. For cardiovascular disease: AHA recommends 1 g/day EPA+DHA. For severe hypertriglyceridemia: 2–4 g/day EPA+DHA (prescription formulations recommended for these doses). High-dose omega-3s (>3 g/day) can increase bleeding risk and should be used under medical supervision. EPA from ALA (plant omega-3 in flaxseed, walnuts) conversion is very inefficient — direct marine or algae sources are preferred.

Alpha-linolenic acid (ALA, 18:3n-3), the plant-derived omega-3 in flaxseed, chia seeds, and walnuts, can be converted to EPA by the enzymes delta-6-desaturase and elongases. However, conversion efficiency is very low — typically less than 5–10% of ALA is converted to EPA in humans, and even less to DHA (<1%). Conversion is further reduced by high omega-6 (linoleic acid) intake, which competes for the same enzymes. Therefore, plant-based ALA intake cannot reliably substitute for pre-formed EPA from marine or algae sources, particularly for cardiovascular therapeutic effects.