Flaxseed oil

Also known as flax oil, linseed oil, ALA.

Last reviewed October 9, 2026 · Jump to references

What is Flaxseed oil?

In plain words

Flaxseed oil is oil from flax seeds, rich in an essential omega-3 fat called ALA. The body uses its fats for energy and cell structures, and changes only a small amount of ALA into the omega-3 fats found in fish. Researchers study it for effects on blood fats, heart health, and inflammation. Evidence that flaxseed oil itself prevents heart disease remains limited.

Technical definition

Flaxseed oil is a triglyceride-rich oil extracted from seeds of Linum usitatissimum, with alpha-linolenic acid (ALA), an essential 18-carbon omega-3 fatty acid, as its principal polyunsaturated fatty acid. Digestion releases fatty acids that are incorporated into lipids or oxidized for energy; ALA can also be converted to EPA and DHA, but conversion is limited, particularly to DHA, and the oil does not act through a single specific receptor. It is marketed as a food and dietary supplement, not as an FDA-approved treatment for disease.

Educational information only. This page does not provide medical advice or determine whether a supplement is appropriate for you. Review supplements with a qualified healthcare professional, especially if you take medication, are pregnant, have surgery scheduled, or have a chronic medical condition.

Evidence by use

Each use is rated on its own. There is no single overall effectiveness score.