Krill oil is best taken with a meal that contains some fat, in doses ranging from 500 mg to 2,000 mg per day depending on your health goals. Because the omega-3 fats in krill oil are bound to phospholipids rather than triglycerides, your body absorbs them more efficiently than standard fish oil, especially at lower doses. That said, getting the most from your supplement comes down to timing, dosage, and a few practical details worth knowing.
How Much to Take
A typical 500 mg krill oil capsule delivers roughly 60 mg of EPA and 30 mg of DHA, the two omega-3 fatty acids responsible for most of krill oil’s benefits. That’s a modest amount per capsule, so how many you need depends on what you’re trying to accomplish.
For general heart health, the American Heart Association recommends about 1 gram of combined EPA and DHA daily. To hit that target from krill oil alone, you’d need several capsules per day. For cholesterol support, studies have used krill oil at doses between 500 mg and 4 grams daily for periods of 4 weeks to 3 months, with doses of at least 2 grams per day likely needed to raise HDL (“good”) cholesterol. If you’re primarily looking for a basic omega-3 boost and you already eat fatty fish regularly, 1,000 mg of krill oil daily is a common starting point.
The FDA considers combined EPA and DHA intakes up to 5 grams per day safe from supplements, though supplement labels are recommended to cap their suggested dose at 2 grams of EPA and DHA combined. For most people taking standard krill oil capsules, staying well under that ceiling is easy.
When and How to Take It
Take your krill oil with a meal or snack that includes dietary fat. This significantly improves absorption of EPA and DHA and reduces the chance of stomach discomfort, which is the most common side effect. A meal with avocado, eggs, nuts, cheese, or olive oil works well. Taking krill oil on an empty stomach won’t be dangerous, but you’ll absorb less of what you’re paying for and you’re more likely to notice an unpleasant aftertaste or mild nausea.
Morning or evening doesn’t matter. Consistency is more important than the specific time of day. Pick whichever meal you’re most likely to remember, and stick with it. If your dose calls for multiple capsules, you can split them between meals or take them all at once.
Why Krill Oil Absorbs Differently Than Fish Oil
The omega-3s in fish oil are stored as triglycerides, while krill oil carries them primarily as phospholipids. Phospholipids mix with water more easily, which helps your gut absorb them with less effort. A 2024 network meta-analysis published in ScienceDirect confirmed that at doses under 2,000 mg, krill oil delivers superior omega-3 absorption compared to fish oil. The practical takeaway: you may need fewer milligrams of krill oil to get the same blood levels of omega-3s that a higher dose of fish oil would provide.
Krill oil also naturally contains a small amount of astaxanthin, a red-orange antioxidant pigment. A standard 500 mg capsule provides about 61 micrograms. That’s a trace amount compared to dedicated astaxanthin supplements, but it contributes to the oil’s stability and gives the capsules their distinctive red color.
Side Effects and Who Should Be Cautious
Most people tolerate krill oil well. The most common complaints are fishy burps, mild nausea, and loose stools, all of which tend to improve when you take it with food. Krill oil generally causes fewer fishy aftertaste issues than standard fish oil, partly because of its phospholipid structure.
If you take blood-thinning medications like warfarin or antiplatelet drugs like aspirin or clopidogrel, omega-3 supplements at doses under 3 grams daily are generally considered safe to combine with these medications. Higher doses may theoretically increase bleeding risk by reducing platelet clumping. If you’re on newer blood-thinning medications, the interaction hasn’t been well studied, so that’s a conversation worth having with your prescriber.
Shellfish Allergies
Krill are crustaceans, so people with shrimp allergies sometimes worry about cross-reactivity. Research published in the Journal of Allergy and Clinical Immunology found that krill protein is far less allergenic than shrimp. Krill extract required 100 times the concentration to produce the same allergic response as shrimp extract in lab testing, and the researchers concluded it’s unlikely that krill ingestion would trigger a reaction in shrimp-allergic individuals. Still, if you have a severe or anaphylactic shellfish allergy, the theoretical risk of cross-reactivity exists because krill and shrimp share a similar protein called tropomyosin.
How to Store Krill Oil
Heat accelerates the breakdown of the fats in krill oil. Research examining krill oil stored at room temperature (20°C) versus warmer conditions (40°C) found that higher temperatures significantly increased lipid oxidation over just a few weeks. Oxidized oil not only loses its beneficial properties but can develop off-putting flavors and odors.
Keep your krill oil in a cool, dry place away from direct sunlight. A kitchen cabinet away from the stove works fine. If you live somewhere warm or buy in bulk, storing the bottle in the refrigerator extends its shelf life. If your capsules start to smell strongly rancid or taste noticeably off, that’s a sign of oxidation, and you should replace the bottle rather than continue taking them.
How Long Before You Notice Results
Clinical trials studying krill oil’s effects on cholesterol and other blood markers typically run 4 weeks to 3 months. You won’t feel a difference in the first few days. Omega-3 fatty acids gradually incorporate into your cell membranes over weeks of consistent supplementation, so the benefits build slowly. Most people won’t notice a subjective change at all. The effects show up in blood work: lower triglycerides, improved cholesterol ratios, and a higher omega-3 index over time. If you’re taking krill oil for joint comfort, many users report improvement in the 4 to 6 week range, though individual responses vary.
The key word is consistency. Skipping doses frequently or taking krill oil for a week and stopping means your blood levels of EPA and DHA never reach the range where benefits kick in. Treat it like any daily supplement: same time, same routine, taken with food.