Psyllium is a member of the plant family Plantaginaceae. Psyllium is a seed used for medicinal purposes taken from the common fleawort, Plantago psyllium. Psyllium stalks contain tiny seeds, also called Psyllium, covered by husks, which are the parts used in foods. There are several species of psyllium, but the seed husks from Plantago ovata, also known as blonde psyllium, have the best quality and highest fiber content. Psyllium is an excellent fiber because it acts like a sponge helping to clean the intestines.