Krill Oil: Uses, Benefits, Dosage & Safety

Last updated: June 2026 · Reviewed by the FactoWiki Editorial Team for clarity and source accuracy

What is Krill Oil?

Krill oil is extracted from tiny shrimp-like crustaceans (Antarctic krill). Like fish oil it supplies the omega-3 fatty acids EPA and DHA, but bound to phospholipids rather than triglycerides, and it naturally contains the antioxidant astaxanthin, which gives it a red colour.

What Krill Oil is commonly used for

In supplements, Krill Oil is most often included for joint & bone health, brain & memory support. It is used as nutritional support, not as a treatment for any medical condition — the distinction matters, because the claims on a sales page are often stronger than the evidence allows.

How Krill Oil works

EPA and DHA support heart, brain, eye and joint health by reducing inflammatory signalling and forming part of cell membranes. The phospholipid form in krill may be absorbed efficiently, so a smaller omega-3 amount may match a larger fish-oil dose, and the astaxanthin adds antioxidant protection.

What the evidence says

Here's an honest snapshot of what published research suggests about Krill Oil — including where the evidence is limited.

• Krill oil delivers EPA/DHA with evidence for heart, joint and triglyceride benefits similar to fish oil, sometimes at lower omega-3 doses due to better absorption. (PubMed research)
• Head-to-head superiority over fish oil is debated, and krill provides less total omega-3 per capsule, at higher cost. (PubMed research)

Typical dosage used in studies

Doses vary; krill oil provides less EPA/DHA per gram than concentrated fish oil, so check the omega-3 content on the label. This is research information for context, not a recommendation — confirm what's appropriate for you with a healthcare professional.

Side effects and safety

Generally well tolerated, with less 'fishy' aftertaste than fish oil. It's a shellfish product, so those with shellfish allergy should avoid it.

Medication interactions and who should avoid Krill Oil

Sources & further reading

The summary above is drawn from peer-reviewed research and authoritative references. For general, authoritative background you can also consult:

• PubMed research on Krill Oil
• NIH Office of Dietary Supplements
• NIH National Center for Complementary and Integrative Health
• MedlinePlus (U.S. National Library of Medicine)

Frequently asked questions

Is krill oil better than fish oil?

It may absorb better and contains astaxanthin, but it provides less omega-3 per capsule and costs more; superiority is debated.

Can I take krill oil with a shellfish allergy?

No — krill is a crustacean, so those with shellfish allergy should avoid it.

What is astaxanthin doing in krill oil?

It's a natural antioxidant that gives krill its red colour and helps protect the oil.

Does krill oil thin the blood?

At higher omega-3 doses it can add to blood-thinning effects.