Abstract
Although true psyllium comes from the plant Plantago psyllium, the husk and seed of Plantago ovata (Plantaginaceae) is commonly referred to as psyllium. Psyllium is widely used as a fiber supplement for the treatment of constipation. Psyllium husk is obtained by milling the seed of P. ovata to remove the hulls. In some studies the seed has been used instead of the husk, and is also commercially available.