Krill Oil

Best for

Raise omega-3 levels

Large effect, needs confirmation · 1300–4000 mg/day for 4–24 weeks · 2 studies , n=86

6 papers · 4 claims · 19 outcomes scored · 2 positive

Outcomes

What krill oil 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.

2 RCTs n=86 1300–4000 mg 4–24 wk #1/6

34959789·39009356

large

2 RCTs n=86

1300–4000 mg

4–24 wk

#1 /6

Lower triglycerides Likely modest benefit

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

1 RCT n=520 4000 mg 12–26 wk #1/89

34989797

small

1 RCT n=520

4000 mg

12–26 wk

#1 /89

Improve omega-3 to omega-6 ratio Not enough research

Less raw material for inflammation, more for resolving it.

1 RCT n=— 2500 mg 12 wk #1/6

34959789

—

1 RCT n=—

2500 mg

12 wk

#1 /6

Lose body fat Not enough research

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

1 study n=— 3 g 8 wk #8/56

29854443

—

1 study n=—

3 g

8 wk

#8 /56

Outcome	Effect	Evidence	Dose	Weeks	Rank
Raise omega-3 levels Large effect, needs confirmation	large	2 RCTs n=86	1300–4000 mg	4–24 wk	#1/6
Lower triglycerides Likely modest benefit	small	1 RCT n=520	4000 mg	12–26 wk	#1/89
Improve omega-3 to omega-6 ratio Not enough research		1 RCT n=—	2500 mg	12 wk	#1/6
Lose body fat Not enough research		1 study n=—	3 g	8 wk	#8/56

Buy well

Recommended Krill Oil products

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

Chosen for adequate Krill Oil 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

Evidence map
Metabolic health
Metabolic health: evidence map across 82 supplements
Evidence coverage map
Jul 30, 2026

Krill Oil

Recommended Krill Oil products

More evidence for Krill Oil

NewMetabolic health: evidence map across 82 supplements

Metabolic health: evidence map across 82 supplements