SupplementScience

Omega-3 — Frequently Asked Questions

DJP
Reviewed by , MD, Board Certified Internal Medicine

This content is for informational purposes only and does not constitute medical advice. Consult your healthcare provider before starting any supplement. Full disclaimer

Frequently Asked Questions

How much omega-3 should I take daily?

For general health, 1,000-2,000mg of combined EPA+DHA daily is recommended. Note that this refers to the EPA+DHA content, not total fish oil — a 1,000mg fish oil capsule may contain only 300mg EPA+DHA. For specific conditions like depression or joint pain, higher doses of 2,000-3,000mg may be beneficial.

What is better: EPA or DHA?

Both are important but serve different primary roles. EPA is more anti-inflammatory and has stronger evidence for mood and cardiovascular benefits. DHA is the primary structural fat in the brain and retina, making it critical for cognitive function and eye health. For depression, choose EPA-predominant formulas (>60% EPA). For brain health, ensure adequate DHA.

Is fish oil safe with blood thinners?

Omega-3s have mild antiplatelet effects and could theoretically increase bleeding risk when combined with blood thinners like warfarin. However, clinical studies have generally not shown significant bleeding events at standard doses (1-2g/day). Still, inform your doctor and monitor INR if taking both. Doses above 3g/day warrant closer monitoring.

Can vegans get enough omega-3 without fish oil?

Yes. Algal oil supplements provide both EPA and DHA derived from microalgae, the same original source that fish obtain their omega-3s from. Studies show algal oil raises blood DHA and EPA levels comparably to fish oil. Typical vegan doses are 250-500mg DHA + EPA from algal oil daily.

Full Omega-3 Guide

References

  1. (). Cardiovascular Risk Reduction with Icosapent Ethyl for Hypertriglyceridemia. New England Journal of Medicine. DOI
  2. (). Efficacy of omega-3 PUFAs in depression: A meta-analysis. Translational Psychiatry. DOI
  3. (). Omega-3 fatty acids and inflammatory processes: from molecules to man. Biochemical Society Transactions. DOI
  4. (). Long-chain omega-3 fatty acids and the brain: a review of the independent and shared effects of EPA, DPA and DHA. Frontiers in Aging Neuroscience. DOI