Krill oil is a marine omega-3 supplement made from small Antarctic crustaceans. This site collects background information on what the oil contains, how it differs from the more familiar fish oil, and what is known about the way krill is harvested. It is an informational resource and does not sell anything.
Krill oil at a glance
Producers of krill oil usually point to three components that set it apart from ordinary fish oil.
- Omega-3 fatty acids (EPA and DHA). These are the long-chain fats most often discussed in connection with heart, eye and brain health.
- Phospholipids. In krill oil the omega-3s are largely bound to phospholipids, the same family of molecules that forms the outer layer of every cell. Fish oil mostly carries its omega-3s in triglyceride form.
- Astaxanthin. A red carotenoid pigment that gives krill its colour and acts as an antioxidant. Fish oil does not naturally contain it.
Brands in this category often say that the omega-3s in krill oil are absorbed more readily than those in fish oil, that the capsules are smaller, and that people notice less fishy aftertaste. These are manufacturer claims, and the strength of the evidence behind them varies from study to study.
Where to read more
- What krill are and why the oil is of interest
- Frequently asked questions about krill oil
- What to look for in a krill oil softgel
- What distinguishes one krill oil from another
- How sustainable is krill harvesting?
- Charity partnerships in the supplement sector
- Everyday wellness articles
Health topics people associate with omega-3
Omega-3 fatty acids are discussed in relation to cardiovascular health, joint comfort, eye and brain function, and women’s health. Public-health bodies generally suggest getting omega-3s from food first, in particular from oily fish a couple of times a week, and treat supplements as a possible option for people who do not eat fish. Nothing here is medical advice. Anyone with a health condition, who is pregnant, or who takes blood-thinning medication should talk to a doctor or pharmacist before adding a supplement.
About harvesting
Antarctic krill is among the most abundant animal populations on Earth and is a staple food for whales, seals, penguins and seabirds. The fishery is overseen by an international body, CCAMLR, which sets annual catch limits. The original site stated that less than 1.5 percent of the total biomass is taken each year and that its supplier held a Friend of the Sea certification for sustainable krill harvesting. Our page on the sustainability question goes into more detail.
French readers can find a translated overview on the French home page.