Flax is one of the oldest fiber crops in the world. It is known to have been cultivated in ancient Egypt and China. In Asia, it has played a role in Ayurvedic medicine for thousands of years. Flaxseed is the seed from the plant Linum usitatissimum. The seed or the seed oil is used to make medicine. Flaxseed is a rich source of healthy fat, antioxidants, and fiber. The seeds contain protein, lignans, and the essential fatty acid alpha-linolenic acid, also known as ALA or omega-3.