Eicosapentaenoic Acid (EPA)

🔗 Omega-3 Family & Related Pages

EPA is one of the three key Omega-3 fatty acids. Explore each:

Compare other fats: Omega-6 • Omega-9 (incl. Oleic acid).

🧬 Molecular Identity

• Chemical formula: C₂₀H₃₀O₂ • 20:5 (n-3)
• Source: Marine oils (fish, krill) and microalgae
• Solubility: Fat-soluble; absorbed with dietary lipids
• Structure: Long-chain polyunsaturated with five cis double bonds

🌿 Plain-Language Summary

EPA is a long-chain omega-3 fatty acid involved in normal inflammatory resolution and cell signalling. It’s produced in small quantities from dietary ALA, but most comes from direct dietary sources such as oily fish or algae.

⚡ Functions

• Acts as a substrate for specialised pro-resolving mediators (SPMs)
• Supports normal membrane fluidity and receptor signalling
• Works with DHA to maintain cellular structure

🍽️ Absorption & Bioavailability

EPA competes with omega-6 arachidonic acid for enzymes, influencing balance of eicosanoid mediators.

🇦🇺 Australian Reference Values

• Suggested Dietary Target (EPA + DHA): ~610 mg/day (men) • ~430 mg/day (women)
• ALA Adequate Intake (AI): 1.3 g/day (men) • 0.8 g/day (women)
• Source: NHMRC Nutrient Reference Values

🥗 Food Sources

• Marine: Salmon, sardines, mackerel, herring, anchovies, tuna
• Plant-based: Algal oil (contains EPA ± DHA)

Wild fish contain higher EPA/DHA than farmed. See also DHA and ALA.

🧪 Testing & Monitoring

• Omega-3 Index (% EPA + DHA in RBC membranes) — optional
• Fatty acid profiles available in specialised labs (research use)
• Clinical testing only when clinically indicated

🔗 Interactions & Synergy

• High-dose fish oil may interact with anticoagulants — monitor clinically
• Shares pathways with arachidonic acid (omega-6)
• Synergistic nutrients: zinc, magnesium, vitamin B6, vitamin E

Compare with Omega-6 and Omega-9.

⚠️ Deficiency & Excess

Low Intake Patterns

Low omega-3 status may present as dry skin, fatigue, or elevated triglycerides (usually multifactorial).

Excess Intake

• High-dose supplements may increase bleeding tendency in some people
• Always use under professional guidance

📊 Evidence Snapshot

• 🔬✅ Established: Structural and signalling roles in cell membranes and inflammatory balance
• 🧪⚖️ Promising/Mixed: Cardio-metabolic outcomes depend on dose and baseline status
• ⚠️❌ Unproven: Generalised performance or rapid fat-loss claims

See Omega-3 Overview for full context and links to DHA and ALA.