Flaxseed oil is derived from the seeds of the flax plant (Linum usitatissimum, L.). Flaxseed oil and flaxseed contain substances that promote good health. One of these substances is alpha-linolenic acid (ALA), an essential fatty acid that appears to be beneficial for heart disease, inflammatory bowel disease, arthritis, and other health conditions. Flaxseed, in addition to ALA, contains a group of chemicals called lignans that may play a role in the prevention of cancer. Please see the flaxseed monograph for further information on this herbal agent.