Have you been wondering what is psyllium fiber? Psyllium has been gaining popularity in the United States since the 1930s as an over-the-counter supplement for digestive support and regularity. Before its reception in the West, it was used for millennia in Indian Traditional Systems as a laxative and diuretic. It also has widespread use throughout the world, especially the Mediterranean, West Asia (Turkey, Jordan, Syria) and North Africa (Egypt). The plant is alternatively known as isabgol or aspaghol, which is derived from the Persian asp and gul, meaning horse flower, in reference to the horse ear shape of the seeds.