How much omega-3 should I take daily?

A common target is 1600 mg combined EPA and DHA daily for men and 1100 mg for women, which is roughly equivalent to two servings of oily fish per week. Read the label for the EPA+DHA figure rather than total oil weight.

Should I take fish oil with food?

Yes. Omega-3 fatty acids require dietary fat to be packaged into chylomicrons for absorption. Taking them with a fat-containing meal improves uptake and reduces reflux.

Is fish oil a blood thinner?

It has mild antiplatelet activity at higher doses, not a true anticoagulant effect. Above 2 g combined EPA+DHA daily, that effect adds to warfarin and direct oral anticoagulants, so tell your prescriber.

Is krill oil better than fish oil?

It is not clearly better. Krill oil provides omega-3 in phospholipid form, which may absorb with less dietary fat, but the evidence does not show superiority over high-quality fish oil at equivalent EPA+DHA doses.

What is the difference between EPA and DHA?

DHA is concentrated in retinal and neuronal membranes and is important for vision and cognition. EPA is more associated with inflammatory and mood outcomes. Both matter, which is why combined intake is the target.

Omega-3 (EPA/DHA): Dose, Form and Interactions

Key points

Count combined EPA+DHA, not total fish oil weight.
Take with fat — absorption depends on chylomicron formation.
Above 2 g daily, watch for additive bleeding risk with anticoagulants.

EPA, DHA and what they do

EPA and DHA are long-chain omega-3 fatty acids. They are incorporated into cell membranes and serve as substrates for resolvins and protectins, which are actively involved in resolving inflammation rather than simply suppressing it.

DHA is concentrated in retinal and neuronal membranes and matters for visual and cognitive function. EPA is more strongly associated with mood and inflammatory outcomes. A product that lists only total fish oil weight without breaking out EPA and DHA is telling you very little.

Forms and absorption

Triglyceride-form fish oil is the natural form and is well absorbed. Ethyl ester form is more concentrated but absorbed slightly less well unless taken with a fatty meal. Re-esterified triglyceride combines the concentration of ethyl esters with the absorption of triglyceride form.

Krill oil provides phospholipid-bound omega-3, which is absorbed differently and may require less fat co-ingestion. Algal oil is the vegan equivalent and studies show comparable bioavailability.

Interactions

Omega-3 fatty acids displace arachidonic acid and reduce thromboxane A2 production, which mildly prolongs bleeding time. Combined with warfarin or a direct oral anticoagulant, this is additive. Doses up to 2 g combined EPA+DHA are generally tolerated with monitoring; higher doses need prescriber awareness.

Orlistat reduces fat absorption and therefore omega-3 absorption. Separate by at least two hours.