Omega-3 Fish Oil

Also known as: EPA/DHA, fish oil, omega-3, eicosapentaenoic acid, docosahexaenoic acid

Grade A — Strong Evidenceessential fatty acidfoundational

Recommended Dosage

1000–3000 mg EPA+DHA

With meals, split if >2g

Omega-3 fatty acids (EPA and DHA) are essential fats your body cannot produce. They're critical structural components of cell membranes, particularly in the brain and retina. The modern Western diet is heavily skewed toward omega-6 fats, creating an inflammatory imbalance that omega-3 supplementation can help correct. Large-scale trials consistently show cardiovascular benefits, and EPA specifically has shown antidepressant effects in meta-analyses.

TL;DR: Essential fatty acids with strong evidence for cardiovascular and mental health. EPA-dominant for mood; triglyceride form for absorption.

❤️Heart Health😊Mood🧠Cognitive Performance🧬Longevity
Last reviewed: 2026-03-09

Evidence Rating: Grade A — Strong Evidence

Multiple high-quality RCTs, systematic reviews, or meta-analyses with consistent findings.

Forms Comparison

Triglyceride (rTG) Form

✓ High Absorption

Re-esterified triglyceride form. Closest to natural fish oil with superior absorption.

general healthbest absorption

Ethyl Ester (EE) Form

~ Moderate Absorption

Most common and cheapest form. Lower absorption than triglyceride form, especially without food.

budget option

Phospholipid Form (Krill Oil)

✓ High Absorption

Omega-3s bound to phospholipids. Contains astaxanthin. Smaller capsules but lower total EPA/DHA.

brain healththose who dislike large capsules

Algal Oil

~ Moderate Absorption

Plant-based DHA (and sometimes EPA) from microalgae. The vegan alternative.

veganssustainability concerns

Interaction Warnings

Blood thinners (warfarin, aspirin)High Risk

Increases bleeding risk at >3g/day. Monitor INR.

Blood pressure medicationsLow

May enhance blood pressure lowering effects

⚠️ Important Notes

  • Choose products tested for heavy metals
  • High doses may cause fishy burps — take with meals or use enteric-coated
  • Triglyceride form better absorbed than ethyl ester

Clinical Evidence (3 studies)

REDUCE-IT trial: icosapentaenoic acid and cardiovascular events

Bhatt DL et al. (2019) — N Engl J Med

Icosapentaenoic acid 4g/day reduced major adverse CV events by 25% in statin-treated patients

View on PubMed

Meta-analysis: EPA:DHA ratio for depression

Sublette ME et al. (2011) — J Clin Psychiatry

EPA-predominant formulas superior for depression

View on PubMed

Omega-3 fatty acids for depression in adults

Appleton KM et al. (2021) — Cochrane Database Syst Rev

Small-to-modest benefit for depression, primarily from EPA

View on PubMed

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Vitamin D3

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⚕️ Important Disclaimer

This information is for educational purposes only. It is not medical advice. Always consult a healthcare provider before starting any supplement regimen, especially if you take medications or have health conditions.

Evidence Stack does not sell supplements and has no affiliate relationships with supplement manufacturers.