Best Omega-3 Dose for Inflammation: What RCTs Actually Show
Short answer: For general anti-inflammatory effects, 1-2g combined EPA+DHA daily. For clinical reduction of inflammation biomarkers (CRP, IL-6), 3-4g EPA+DHA daily based on RCT data. For cardiovascular risk reduction specifically, the REDUCE-IT trial used 4g pure EPA (as icosapentaenoic acid / Vascepa) daily — this is prescription-level. Most standard fish oil capsules contain only 300mg EPA+DHA per capsule, meaning you need 3-7 capsules daily to hit effective doses. Always check the label for EPA+DHA content, not total fish oil weight.
Why your current fish oil dose is probably too low
The most common mistake in omega-3 supplementation: buying a bottle labelled “1,000mg Fish Oil” and assuming you’re getting 1,000mg of anti-inflammatory omega-3. You’re not. A standard 1,000mg fish oil softgel typically contains 180mg EPA and 120mg DHA — totalling 300mg combined EPA+DHA — with the remaining 700mg being other fatty acids with no particular anti-inflammatory activity. To reach 2g combined EPA+DHA, you’d need 7 of these standard capsules daily. This is why high-concentration fish oil products (which provide 1,000mg+ EPA+DHA per capsule) exist — they’re not more expensive per unit of active ingredient, they just save you from taking a handful of capsules.
What doses achieve what outcomes
1g EPA+DHA/day — maintenance and general health
A 2019 NEJM randomised trial (25,871 participants, VITAL study) found 1g/day omega-3 supplementation reduced major cardiovascular events by 28% in people who eat little fish. Significant reductions in cancer mortality observed. Sufficient for maintenance in people not at elevated cardiovascular risk.
2-4g EPA+DHA/day — inflammation and cardiovascular risk
A 2012 Atherosclerosis meta-analysis of 20 RCTs found doses of 3.5g/day EPA+DHA significantly reduced CRP by 14% and IL-6 by 8% vs lower doses. A 2021 Nutrients meta-analysis confirmed omega-3 at 2-4g/day produces significant reductions in triglycerides (20-30%), relevant for metabolic syndrome management.
EPA vs DHA: does the ratio matter?
EPA is primarily responsible for the anti-inflammatory effect (converts to anti-inflammatory resolvins). DHA is more important for brain structure and cognitive function. For inflammation specifically, high-EPA products are preferred. For cognitive support, products with higher DHA are better. Most general fish oils provide both in roughly 3:2 EPA:DHA ratio.
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- Manson JE et al. (2019). Marine n-3 fatty acids and prevention of cardiovascular disease and cancer. N Engl J Med, 380(1), 23-32. PubMed →
- Calder PC. (2013). Omega-3 polyunsaturated fatty acids and inflammatory processes. Biochim Biophys Acta, 1851(4), 469-84. PubMed →
- Bhatt DL et al. (2019). Cardiovascular risk reduction with icosapentaenoic acid for hypertriglyceridemia. N Engl J Med, 380(1), 11-22. PubMed →
