Popular and available in many forms, flaxseed and flaxseed oil are, according to Bauer, "rich sources… of alpha-linolenic acid," a heart-healthy fatty acid.
Flaxseed’s health benefits are many. People use it to: ease constipation, reduce cholesterol, manage blood sugar, and relieve symptoms of menopause. Also, the lignans in flaxseed may have cancer-fighting properties.
Side effects: Bloating, gas and diarrhea. Avoid taking it in conjunction with other supplements, as flaxseed may lower the body’s ability to absorb medications.