Overview

Flaxseed and flaxseed oil are rich sources of an omega-3 fatty acid called alpha-linolenic acid. Research shows that omega-3 fatty acids are good for the heart.

Flaxseed has a lot of fiber. It's also high in substances called lignans that are found in plants. Lignans contain phytoestrogens. Some research suggests that phytoestrogens may help fight cancer. Flaxseed oil does not have fiber or phytoestrogens.

Flaxseed can be used whole or crushed. It also comes in a powder form as meal or flour. It's often mixed with or baked into foods. Flaxseed oil is available as a liquid or as capsules.

People use flaxseed and flaxseed oil to help lower cholesterol and blood sugar and to treat digestive conditions. Some people also take flaxseed to treat inflammatory diseases.