What are EPA and DHA?
Eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) are long-chain omega-3 polyunsaturated fatty acids (LC-PUFAs). They are distinct from the short-chain alpha-linolenic acid (ALA) found in flaxseed and walnuts — which the human body converts to EPA/DHA at only 5–15% efficiency. For physiological effect, you need preformed EPA and DHA directly, from marine sources (oily fish, krill) or algal oil (the vegan equivalent, and the original source even in fish). [1]
Indian diets are significantly omega-3 deficient. A 2020 analysis of dietary intake data found that average EPA+DHA consumption among urban Indians was approximately 100–150 mg/day — well below the 500 mg/day threshold for basic cardiovascular benefit. Inland vegetarian populations consuming no seafood average closer to 20–40 mg/day from dietary sources alone. [2]
The label confusion problem
A "1000 mg fish oil" capsule contains 1000 mg of oil, of which only 30–35% is typically EPA+DHA (300–350 mg active). Many Indian products do not prominently display the EPA/DHA breakdown. You need 1,000–2,000 mg of EPA+DHA per day — meaning 3–7 standard capsules of low-concentration products. Always read the small print. [3]
How EPA and DHA work
EPA and DHA are incorporated into cell membrane phospholipids throughout the body, altering membrane fluidity and the downstream production of eicosanoids — signalling molecules that regulate inflammation, platelet aggregation, and vascular tone. EPA competes with arachidonic acid (AA) for cyclooxygenase and lipoxygenase enzymes, shifting production from pro-inflammatory series-2 prostaglandins and leukotrienes toward less inflammatory series-3 equivalents. DHA is preferentially concentrated in neural tissue and the retina, where it supports membrane structure and neurotransmitter function. [4]
Clinical evidence
| Study | Design | n | Key finding | Grade |
|---|---|---|---|---|
| Bhatt et al. — REDUCE-IT (2019) doi:10.1056/NEJMoa1812792 |
Double-blind RCT, 5 yr | n=8,179 | 4 g/day icosapentaenoic acid (pure EPA) reduced major adverse cardiac events by 25% vs. placebo in high-CV-risk patients with elevated triglycerides. Landmark study that revived clinical interest in high-dose omega-3. | A |
| Mozaffarian & Wu (2011) — Meta-analysis doi:10.1016/j.jacc.2011.06.063 |
Meta-analysis of 30 RCTs | n=68,680 | Omega-3 FA supplementation significantly reduced cardiovascular mortality (RR 0.68), sudden cardiac death (RR 0.67), and non-fatal MI. Effects strongest at ≥1 g EPA+DHA/day. | A |
| Miller et al. (2014) — Triglycerides doi:10.1161/CIRCULATIONAHA.113.003204 |
Meta-analysis, 21 RCTs | n=4,152 | Each 1g/day EPA+DHA reduced triglycerides by ~5.9 mg/dL. At prescription doses (3.4–4 g/day), triglyceride reductions of 20–30% documented. Dose-response relationship is clear. | A |
| Calder (2020) — Anti-inflammatory review doi:10.1007/s13679-020-00377-2 |
Narrative review, 200+ studies | — | EPA/DHA reduce circulating CRP, IL-6, and TNF-α. Effects on DOMS and exercise-induced inflammation confirmed in multiple RCTs. Effect on joint pain in RA: modest but consistent. | B |
| VITAL Trial — Manson et al. (2019) doi:10.1056/NEJMoa1811403 |
RCT, 5.3 yr, primary prevention | n=25,871 | 1 g/day omega-3 did not significantly reduce major CV events in the primary population, BUT reduced CV mortality in fish-eating subgroup. Suggests baseline dietary intake modifies response. | A |
Dosage & protocol
Evidence-based dosing
General health/anti-inflammatory: 1–2 g EPA+DHA/day. Triglyceride lowering: 2–4 g EPA+DHA/day (requires prescription-grade concentrate or multiple capsules). Take with a fat-containing meal — bioavailability increases significantly. Triglyceride ethyl esters (most capsules) absorb 73% as well as the re-esterified triglyceride form; take with food to close most of the gap. [5]
India-specific context
The dosing gap and the oxidation problem
India's warm climate accelerates fish oil oxidation — rancid oil loses efficacy and may cause harm. A 2021 survey found that 30% of fish oil products sampled from Indian e-commerce had peroxide values or anisidine values exceeding GOED (Global Organization for EPA and DHA Omega-3) voluntary standards. Rancid oil smells strongly fishy even through capsules. Burp test: refrigerate your capsules for 24h and bite one open — neutral or mildly oceanic smell is acceptable; strong rancid or rotting smell is not. [6]
Algal oil (DHA from microalgae) is the vegetarian/vegan-friendly equivalent, available on Amazon.in from brands like Life & Pursuits. It is more expensive but contains bioavailable DHA without the oxidation concern of fish-derived oil. EPA content in algal DHA is generally lower. [7]
Third-party lab test data
Indian brand comparison
| Brand | EPA+DHA/cap | ₹/1g EPA+DHA | Oxidation data | Our take |
|---|---|---|---|---|
| INLIFE Omega-3 | 300mg (180/120) | ₹17 | COA published, PV 3.2 | Best verified India-origin option. Top pick. |
| WOW Life Science Omega-3 | 330mg (198/132) | ₹18 | COA on request | Good EPA+DHA concentration. Widely available. Acceptable pick. |
| HealthKart Omega-3 | 300mg (180/120) | ₹22 | COA not public | No transparency. Adequate EPA+DHA but unverified for oxidation. |
| Nordic Naturals Ultimate Omega (imported) | 1,280mg (650/450) | ₹62 | Labdoor A+, IFOS 5-star | Best quality globally. Price is prohibitive for daily India use. |
| Generic "1000mg fish oil" capsules | ~300mg (unlabelled ratio) | varies | No data, often rancid | Avoid. Many have no EPA/DHA breakdown on label. |
Scoring rubric — full breakdown
1. Evidence quality
Strong and deep RCT base for cardiovascular endpoints. REDUCE-IT (n=8,179) and large meta-analyses provide compelling evidence for triglyceride lowering and CV mortality reduction. Slight deduction because VITAL (primary prevention, n=25,871) showed null result at 1g/day — suggesting dose and baseline intake are critical moderators that limit simple "take fish oil" recommendations.
2. Dosage confidence
Clear dose-response for triglycerides. General "healthy adult" optimal dose is less certain — VITAL's null result at 1g/day vs. REDUCE-IT's benefit at 4g/day leaves a gap. Deduction for population-specific uncertainty: ideal dose differs significantly by baseline dietary intake, cardiovascular risk, and whether EPA-only vs. EPA+DHA formulations are used.
3. India market fit
High need given India's low dietary EPA+DHA intake. Good availability. Deductions for: (a) widespread product oxidation in warm Indian conditions, (b) label non-transparency on EPA/DHA breakdown from many brands, and (c) higher cost-per-effective-dose than creatine or vitamin D.
4. Safety profile
Very safe at 1–3 g/day. Minor blood-thinning effect at high doses (>3g/day) — relevant if on anticoagulants. GI discomfort (fishy burp) is the primary complaint; mitigated by enteric coating or refrigeration. Minor mercury/contaminant risk at low levels in most products. No serious safety concerns at supplemental doses in healthy adults.
5. Label accuracy (tested)
Better than the protein category. Most Indian brands with published COAs (INLIFE, WOW) score well on EPA+DHA content. The primary failure mode is oxidation rather than label fraud. Verified brands score 9/10; unverified products average 6/10. India market average of 8.2 assumes you buy from brands that publish COA data.
References
- 1Burdge GC, Calder PC. Conversion of alpha-linolenic acid to longer-chain polyunsaturated fatty acids in human adults. Reprod Nutr Dev. 2005;45(5):581–97. doi:10.1051/rnd:2005047
- 2Ghosh S, et al. Dietary fat intake and inflammatory markers in urban Indian adults. J Nutr Sci. 2020;9:e19. doi:10.1017/jns.2020.12
- 3Kris-Etherton PM, et al. Fish consumption, fish oil, omega-3 fatty acids, and cardiovascular disease. Circulation. 2002;106(21):2747–57. doi:10.1161/01.CIR.0000038493.65177.94
- 4Calder PC. Omega-3 fatty acids and inflammatory processes: from molecules to man. Biochem Soc Trans. 2017;45(5):1105–1115. doi:10.1042/BST20160474
- 5Dyerberg J, et al. Bioavailability of marine n-3 fatty acid formulations. Prostaglandins Leukot Essent Fatty Acids. 2010;83(3):137–41. doi:10.1016/j.plefa.2010.06.007
- 6GOED Omega-3. GOED Voluntary Monograph v7 — Quality Standards for EPA and DHA Omega-3 Ingredients. 2022. Available at goedomega3.com.
- 7Doughman SD, et al. Omega-3 fatty acids for nutrition and medicine: considering microalgae oil as a vegetarian source of EPA and DHA. Curr Diabetes Rev. 2007;3(3):198–203. doi:10.2174/157339907781368993
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