What does omega-3 do?

There are two omega-3s that matter: EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid). They do different things:

EPA is the anti-inflammatory powerhouse. Your body converts it into resolvins and protectins — molecules that actively shut down inflammation. This is why EPA-heavy supplements are prescribed for high triglycerides and used to reduce cardiovascular risk.

DHA is the structural builder. It makes up about 40% of the fat in your brain and 60% of the fat in your retina. It's critical for brain function, memory, and visual acuity — and becomes even more important as you age.

What can you expect?

• Lower triglycerides — 15–30% reduction at therapeutic doses (2000+ mg EPA+DHA)
• Reduced inflammation — lower hsCRP, IL-6, and TNF-alpha levels within 8–12 weeks
• Better mood — meta-analyses show EPA-dominant omega-3 reduces depression symptoms
• Joint pain relief — comparable to NSAIDs for some people with inflammatory joint pain
• Dry eye improvement — DHA supports tear film stability
• Cardiovascular protection — reduced risk of cardiac events in people with existing heart disease

How to take it

For high triglycerides: 2000–4000 mg EPA+DHA/day (this is a therapeutic dose — discuss with your doctor). The prescription-grade EPA product Icosapent Ethyl uses 4000 mg EPA/day.

Which form to buy?

• Triglyceride-form fish oil — best absorbed (30–50% better than ethyl ester). Look for "rTG" or "triglyceride form" on the label
• Algae oil — the vegan option. Comes from the same algae fish eat. Higher in DHA, lower in EPA. Good if you're vegetarian or concerned about heavy metals
• Ethyl ester — cheaper but less bioavailable. Fine if you take it with a fatty meal
• Enteric-coated — prevents fishy burps by dissolving in the intestine instead of the stomach

Quality matters: Look for IFOS (International Fish Oil Standards) certification, third-party tested for mercury, PCBs, and oxidation. Store in the fridge to prevent rancidity. In India, expect to pay ₹500–1500/month for quality fish oil with adequate EPA+DHA content.

Frequently Asked Questions

How it works in your body

EPA and DHA are incorporated into cell membrane phospholipids throughout your body. From there, they serve as substrates for specialized pro-resolving mediators (SPMs) — resolvins, protectins, and maresins — that actively resolve inflammation rather than just blocking it (like NSAIDs do).

EPA competes with arachidonic acid (AA) for cyclooxygenase and lipoxygenase enzymes, reducing the production of pro-inflammatory prostaglandins and leukotrienes. DHA is concentrated in neuronal membranes, where it modulates membrane fluidity, receptor function, and synaptic plasticity — critical for cognition and neuroprotection.

In the liver, EPA activates PPAR-alpha, increasing fatty acid oxidation and reducing VLDL production — which is why it lowers triglycerides so effectively.

What the studies show

• REDUCE-IT (2018): 4g/day icosapent ethyl (pure EPA) reduced cardiovascular events by 25% in statin-treated patients with elevated triglycerides — the landmark trial
• Triglycerides: Meta-analyses show 15–30% triglyceride reduction at doses of 2000+ mg EPA+DHA/day
• Inflammation: Systematic reviews confirm reductions in hsCRP (~0.2 mg/L), IL-6, and TNF-alpha with supplementation
• Depression: Meta-analysis of 26 RCTs found EPA-dominant omega-3 supplements significantly reduced depression scores (SMD: -0.28)
• Cognitive decline: Higher DHA levels associated with 47% lower risk of all-cause dementia in the Framingham Heart Study
• Joint health: 2–3 g/day omega-3 reduced morning stiffness and joint tenderness comparably to NSAIDs in some RA trials

Side effects & safety

Omega-3 supplements are very safe. Here's what to know:

• Fishy burps/aftertaste — the most common complaint. Solve it by taking with food, freezing capsules, or choosing enteric-coated or algae-based products
• GI upset — nausea, bloating, or loose stools in ~5% of users, usually in the first week. Splitting the dose across meals helps
• Increased bleeding time — omega-3 has mild antiplatelet effects. At standard doses (<3g/day), this isn't clinically significant. But if you take warfarin, aspirin, or are having surgery, inform your doctor
• Fishy body odor — rare, usually indicates a rancid product. Check the smell of your oil — it should smell like the ocean, not like old fish
• LDL cholesterol — DHA (not EPA) can slightly raise LDL in some people. If this concerns you, choose an EPA-dominant product

Contamination risk: Low-quality fish oil can contain mercury, PCBs, and dioxins. Always choose third-party tested, IFOS-certified products. Algae oil avoids this concern entirely.

Which labs to check

• Omega-3 Index — the gold standard; measures EPA+DHA as percentage of RBC fats. Target: 8–12%. Retest 12 weeks after starting
• Triglycerides — the most responsive lipid marker to omega-3 supplementation
• hsCRP — tracks inflammatory response to omega-3 over 8–12 weeks
• Lipid panel — monitor HDL, LDL, triglycerides as a set

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