Omega-3

Best for

Raise omega-3 levels

Likely strong benefit for 0–244 weeks · 1 meta-analysis , n=3k

202 papers · 16 claims · 322 outcomes scored · 14 positive

Outcomes

What omega-3 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 Likely strong benefit

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

35 meta-analyses n=3.0k 2.5–9120 mg 0–244 wk #1/6

19436468·19709502·21115589·21816071 +31 more

large

35 meta-analyses n=3.0k Meta-analyzed I²=91%

2.5–9120 mg

0–244 wk

#1 /6

Build nutrient stores in pregnancy Likely strong benefit

Tops up the reserves pregnancy drains fastest.

1 RCT n=238 200–1000 mg — #2/4

26413500

large

1 RCT n=238

200–1000 mg

—

#2 /4

Lose body fat Large effect, needs confirmation

Body fat percentage drops and the mirror shows it before the scale does.

5 RCTs n=136 3–3900 mg 8–26 wk #8/56

25852206·33572368·36079794·37081029 +1 more

large

5 RCTs n=136

3–3900 mg

8–26 wk

#8 /56

Slow macular degeneration progression Likely strong benefit

Slows retinal damage to preserve the central vision you use most.

2 meta-analyses n=— 1000 mg 260 wk #2/5

41482231·31358387

large

2 meta-analyses n=— Meta-analyzed

1000 mg

260 wk

#2 /5

Protect against macular degeneration Large effect, needs confirmation

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

2 meta-analyses n=— 1000 mg 260 wk #1/6

31358387·41482231

large

2 meta-analyses n=— Meta-analyzed

1000 mg

260 wk

#1 /6

Ease dry, gritty eyes Likely benefit

Builds a steadier tear film so your eyes stay comfortable between blinks.

6 meta-analyses n=6.4k 300–3000 mg 8–52 wk #1/3

27442314·31425752·38002640·40557177 +2 more

moderate

6 meta-analyses n=6.4k Meta-analyzed I²=96%

300–3000 mg

8–52 wk

#1 /3

Improve school results in children Likely benefit

Better reading scores, sharper math, and fewer absences.

2 RCTs n=362 600–800 mg 16 wk

27188814·22970149

moderate

2 RCTs n=362

600–800 mg

16 wk

—

Lower triglycerides Proven modest benefit

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

32 meta-analyses n=116k 0.3–14000 g 3–183 wk #1/89

23817470·23835245·24507770·25852206 +28 more

small

32 meta-analyses n=116k Meta-analyzed I²=94%

0.3–14000 g

3–183 wk

#1 /89

Protect vision in retinal disease Faint early signal

Keeps sight sharper and retinal signals healthier when disease threatens.

3 meta-analyses n=5.6k 600–3600 mg 208 wk #5/5

29546296·32573764·24805262

small

3 meta-analyses n=5.6k Meta-analyzed I²=82%

600–3600 mg

208 wk

#5 /5

Slow cognitive decline in dementia Proven modest benefit

Memory, attention, and orientation hold up longer before fading.

6 meta-analyses n=2.7k 480–3000 mg 17–156 wk #3/23

24077434·26501267·28075381·29083439 +2 more

small

6 meta-analyses n=2.7k Meta-analyzed

480–3000 mg

17–156 wk

#3 /23

Improve omega-3 to omega-6 ratio Likely modest benefit

Less raw material for inflammation, more for resolving it.

14 meta-analyses n=1.1k 2.5–9120 mg 3–56 wk #1/6

19436468·21816071·26730723·27565734 +10 more

small

14 meta-analyses n=1.1k Meta-analyzed I²=100%

2.5–9120 mg

3–56 wk

#1 /6

Boost overall cognitive performance Barely detectable

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

7 meta-analyses n=14k 230–4950 mg 26–260 wk #5/21

24507770·26305649·34113957·35373862 +3 more

trivial

7 meta-analyses n=14k Meta-analyzed I²=98%

230–4950 mg

26–260 wk

#5 /21

Strengthen healthy birth weight Proven but unnoticeable

Babies who arrive at the right size face fewer risks at birth.

2 meta-analyses n=8.7k 200–1000 mg — #6/7

26413500·30480773

trivial

2 meta-analyses n=8.7k Meta-analyzed

200–1000 mg

—

#6 /7

Strengthen your memory Proven but unnoticeable

Names, conversations, faces, and details stick instead of dissolving.

11 meta-analyses n=1.5k 37–4950 mg 16–156 wk #6/42

25786262·26501267·29083439·31581959 +7 more

trivial

11 meta-analyses n=1.5k Meta-analyzed I²=97%

37–4950 mg

16–156 wk

#6 /42

Sharpen visual clarity Not enough research

Pick out finer detail, edges, and text more easily.

2 meta-analyses n=5.5k — —

29546296·32573764

trivial

2 meta-analyses n=5.5k Meta-analyzed I²=82%

—

Build thinking skills in children Doesn't appear to help

Stronger problem-solving, reasoning, and school performance as children grow.

3 meta-analyses n=5.5k 800 mg —

25803546·27188814·29546296

trivial

3 meta-analyses n=5.5k Meta-analyzed

800 mg

—

Outcome	Effect	Evidence	Dose	Weeks	Rank
Raise omega-3 levels Likely strong benefit	large	35 meta-analyses n=3.0k Meta-analyzed	2.5–9120 mg	0–244 wk	#1/6
Build nutrient stores in pregnancy Likely strong benefit	large	1 RCT n=238	200–1000 mg	—	#2/4
Lose body fat Large effect, needs confirmation	large	5 RCTs n=136	3–3900 mg	8–26 wk	#8/56
Slow macular degeneration progression Likely strong benefit	large	2 meta-analyses n=— Meta-analyzed	1000 mg	260 wk	#2/5
Protect against macular degeneration Large effect, needs confirmation	large	2 meta-analyses n=— Meta-analyzed	1000 mg	260 wk	#1/6
Ease dry, gritty eyes Likely benefit	moderate	6 meta-analyses n=6.4k Meta-analyzed	300–3000 mg	8–52 wk	#1/3
Improve school results in children Likely benefit	moderate	2 RCTs n=362	600–800 mg	16 wk	—
Lower triglycerides Proven modest benefit	small	32 meta-analyses n=116k Meta-analyzed	0.3–14000 g	3–183 wk	#1/89
Protect vision in retinal disease Faint early signal	small	3 meta-analyses n=5.6k Meta-analyzed	600–3600 mg	208 wk	#5/5
Slow cognitive decline in dementia Proven modest benefit	small	6 meta-analyses n=2.7k Meta-analyzed	480–3000 mg	17–156 wk	#3/23
Improve omega-3 to omega-6 ratio Likely modest benefit	small	14 meta-analyses n=1.1k Meta-analyzed	2.5–9120 mg	3–56 wk	#1/6
Boost overall cognitive performance Barely detectable	trivial	7 meta-analyses n=14k Meta-analyzed	230–4950 mg	26–260 wk	#5/21
Strengthen healthy birth weight Proven but unnoticeable	trivial	2 meta-analyses n=8.7k Meta-analyzed	200–1000 mg	—	#6/7
Strengthen your memory Proven but unnoticeable	trivial	11 meta-analyses n=1.5k Meta-analyzed	37–4950 mg	16–156 wk	#6/42
Sharpen visual clarity Not enough research	trivial	2 meta-analyses n=5.5k Meta-analyzed	—	—	—
Build thinking skills in children Doesn't appear to help	trivial	3 meta-analyses n=5.5k Meta-analyzed	800 mg	—	—

Buy well

Recommended Omega-3 products

Real products that dose Omega-3 where the research does, in a clean formulation, from brands we've audited. We only list ones we'd stand behind.

Chosen for adequate Omega-3 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

atrial fibrillation severe

Diarrhea severe

Epistaxis (nosebleed) severe

Severe GI events resulting in treatment discontinuation severe

Dyspnea severe

pain in extremity (grade 3, single case reported) severe

pain severe

hemoglobin_decreased severe

Drug interactions

Cyclophosphamide major decreases effect

Acetaminophen major increases toxicity

Lipid Modifying Agents major increases toxicity

Aspirin moderate increases effect

Warfarin moderate additive

Valproic Acid moderate increases effect

Tazobactam moderate increases concentration

Atorvastatin moderate increases concentration

Antithrombotic Agents moderate increases toxicity

Celecoxib moderate additive

Co-studied with

Supplements that share evidence with omega-3

Omega6Fattyacids Group 8 shared outcomes · d=0.36
Arachidonicacid 4 shared outcomes · d=1.84

Sources

Generated August 14, 2026

Omega-3

What omega-3 actually does, by outcome

Recommended Omega-3 products

Adverse events and known drug interactions

Supplements that share evidence with omega-3

More evidence for Omega-3

Best Supplements to Ease ADHD Symptoms in Children (2026)

Best Supplements for Arthritis and Joint Pain, Ranked by Clinical Evidence

Best Supplements for Depression, Ranked by Clinical Evidence

Best Supplements for Migraines and Headaches, Ranked by Clinical Evidence

Best Supplements for Brain Fog and Mental Clarity, Ranked by Evidence

Best Supplements to Stay Asleep Through the Night

Omega-3

Recommended Omega-3 products

More evidence for Omega-3

NewBest Supplements to Ease ADHD Symptoms in Children (2026)

NewBest Supplements for Arthritis and Joint Pain, Ranked by Clinical Evidence

NewBest Supplements for Depression, Ranked by Clinical Evidence

NewBest Supplements for Migraines and Headaches, Ranked by Clinical Evidence

NewBest Supplements for Brain Fog and Mental Clarity, Ranked by Evidence

NewBest Supplements to Stay Asleep Through the Night

Best Supplements to Ease ADHD Symptoms in Children (2026)

Best Supplements for Arthritis and Joint Pain, Ranked by Clinical Evidence

Best Supplements for Depression, Ranked by Clinical Evidence

Best Supplements for Migraines and Headaches, Ranked by Clinical Evidence

Best Supplements for Brain Fog and Mental Clarity, Ranked by Evidence

Best Supplements to Stay Asleep Through the Night