Also known as: Linum usitatissimum, linseed.
Potential uses: It's thought that lignan in flaxseed may bind to estrogen receptors and may reduce the risk of breast cancer.
Usual dose: 30 to 50 grams per day of flaxseed. It is sold as flaxseeds, flaxseed oil, or capsules of flaxseed oil.
Are there any risks? Possible side effects include mild stomach distress and anaphylaxis (severe allergic reaction).
What does the research show? Some studies have suggested it reduces cell growth. Flaxseed is likely safe for women with estrogen-receptor-negative breast cancer, although its benefits have not been proven in clinical studies.
Read more about flaxseed.