The essential fatty acids in flaxseed oil are its key healing components. EFAs are particularly valuable because the body needs them to function properly, but can't manufacture them on its own. Essential fatty acids work throughout the body to protect cell membranes, keeping them efficient at admitting healthy substances while barring damaging ones. One of the EFAs in flaxseed oil--alpha-linolenic acid--is known as an omega-3 fatty acid. Like the omega-3's found in fish, it appears to reduce the risk of heart disease and numerous other ailments. Flaxseed oil is an excellent source of omega-3's. Flaxseeds also contain omega-6 fatty acids in the form of linoleic acid; omega-6s are the same healthy fats found in vegetable oils. In addition, flaxseeds are a rich source of lignans, substances that appear to positively affect hormone-related problems. Lignans may also be useful in preventing certain cancers and combating specific bacteria, fungi, and viruses, including those that caus