EPA (Eicosapentaenoic Acid)

Best for

Raise omega-3 levels

Large effect, needs confirmation · 900–3276 mg/day for 8–52 weeks · 7 studies , n=299

34 papers · 5 claims · 49 outcomes scored · 5 positive

Outcomes

What epa (eicosapentaenoic acid) actually does, by outcome

Each row is one outcome with effect size, evidence base, the dose that worked in trials, and time to first effect. Magnitude tiers come from native-unit MCID where available, Cohen's d otherwise.

Outcome Effect size Evidence Dose Weeks Rank

Raise omega-3 levels Large effect, needs confirmation

EPA and DHA build up in blood and cell membranes where they work.

7 RCTs n=299 900–3276 mg 8–52 wk #1/6

19709502·23010452·24077434·30866834 +3 more

large

7 RCTs n=299

900–3276 mg

8–52 wk

#1 /6

Improve omega-3 to omega-6 ratio Large effect, needs confirmation

Less raw material for inflammation, more for resolving it.

2 RCTs n=107 1800 mg 12–26 wk #1/6

21816071·27565734

large

2 RCTs n=107

1800 mg

12–26 wk

#1 /6

Protect against macular degeneration Likely strong benefit

Builds the protective pigment that shields your central vision from age.

1 meta-analysis n=— — — #1/6

41482231

large

1 meta-analysis n=— Meta-analyzed

—

#1 /6

Lower triglycerides Proven benefit

Reduces the blood fats that rise after meals and drive heart risk.

3 RCTs n=478 1800–4000 mg 10–26 wk #1/89

23835245·27565734·36522805

moderate

3 RCTs n=478

1800–4000 mg

10–26 wk

#1 /89

Boost overall cognitive performance Likely modest benefit

Broad gains in memory, speed, and mental sharpness at once.

1 RCT n=205 900 mg 26 wk #5/21

34113957

small

1 RCT n=205

900 mg

26 wk

#5 /21

Outcome	Effect	Evidence	Dose	Weeks	Rank
Raise omega-3 levels Large effect, needs confirmation	large	7 RCTs n=299	900–3276 mg	8–52 wk	#1/6
Improve omega-3 to omega-6 ratio Large effect, needs confirmation	large	2 RCTs n=107	1800 mg	12–26 wk	#1/6
Protect against macular degeneration Likely strong benefit	large	1 meta-analysis n=— Meta-analyzed	—	—	#1/6
Lower triglycerides Proven benefit	moderate	3 RCTs n=478	1800–4000 mg	10–26 wk	#1/89
Boost overall cognitive performance Likely modest benefit	small	1 RCT n=205	900 mg	26 wk	#5/21

Buy well

Recommended EPA (Eicosapentaenoic Acid) products

Real products that dose EPA (Eicosapentaenoic Acid) where the research does, in a clean formulation, from brands we've audited. We only list ones we'd stand behind.

Chosen for adequate EPA (Eicosapentaenoic Acid) dosing vs. the studied range, a clean formulation (grade A–C), and independent brand-quality audits. Not sponsored.

Risk profile

Adverse events and known drug interactions

Safety events

gastrointestinal discomfort

headache

tenesmus

weight gain

sedation

extrapyramidal symptoms

any adverse event (increased overall)

adverse events (any)

Sources

Generated August 14, 2026

EPA (Eicosapentaenoic Acid)

What epa (eicosapentaenoic acid) actually does, by outcome

Recommended EPA (Eicosapentaenoic Acid) products

Adverse events and known drug interactions

More evidence for EPA (Eicosapentaenoic Acid)

One Molecule, Two Stories: How EPA Rewrote—and Complicated—the Fish-Oil Saga

Focus & memory: evidence map across 45 supplements

Stress: evidence map across 46 supplements

Metabolic health: evidence map across 82 supplements

EPA (Eicosapentaenoic Acid)

Recommended EPA (Eicosapentaenoic Acid) products

More evidence for EPA (Eicosapentaenoic Acid)

NewOne Molecule, Two Stories: How EPA Rewrote—and Complicated—the Fish-Oil Saga

NewFocus & memory: evidence map across 45 supplements

NewStress: evidence map across 46 supplements

NewMetabolic health: evidence map across 82 supplements

One Molecule, Two Stories: How EPA Rewrote—and Complicated—the Fish-Oil Saga

Focus & memory: evidence map across 45 supplements

Stress: evidence map across 46 supplements

Metabolic health: evidence map across 82 supplements