Krill Oil vs. Fish Oil — What's the Difference?

Krill oil is derived from small crustaceans called Antarctic krill, which are a key part of the marine food chain. It is notable for containing omega-3 fatty acids (EPA and DHA) bound to phospholipids, which are believed to enhance the absorption of these fatty acids in the body. On the other hand, fish oil is obtained from the tissue of oily fish such as salmon, mackerel, and sardines, with omega-3s in the form of triglycerides.

Krill oil's phospholipid-bound omega-3s are considered more easily absorbed by the body compared to the triglyceride-bound omega-3s found in fish oil. This could potentially make krill oil a more efficient source of omega-3, requiring a lower dosage to achieve similar benefits. However, fish oil has been studied more extensively over the years and is a well-established supplement for supporting heart health, reducing triglycerides, and improving overall cardiovascular functions.

Environmental sustainability is another point of difference. Krill harvesting is closely regulated to ensure it does not negatively impact the Antarctic ecosystem, and krill oil is often marketed as a more sustainable option. However, the sustainability of fish oil can vary significantly depending on the source, with some fisheries practicing more sustainable methods than others.

In terms of cost, krill oil is generally more expensive than fish oil, reflecting its lower supply and the more complex extraction process. Consumers may choose between the two based on factors such as price, environmental concerns, and perceived efficacy.

While both krill and fish oils are effective in increasing omega-3 levels in the body, they also have distinct tastes and smells. Krill oil is often considered to have a less fishy taste and odor compared to fish oil, which may be a deciding factor for some individuals.