Plantago ovata Husk Identity & Plant Part
The botanical entity is Plantago ovata Forssk., known as blond psyllium, ispaghula or isabgol. The part used is the husk, the thin outer seed coat that is milled off the seed. The kernel, which holds the embryo, oil and protein, is not part of this psyllium husk extract.
Husk and seed are traded under overlapping names, and “ispaghula” alone can mean the plant, the seed or the seed coat. Seed carries oil, protein and starch, while the husk is mostly mucilage. Black psyllium is a different species, Plantago afra, whose older name is P. psyllium, so a label that lists the two Latin names as separate species is wrong.
The mucilage of the husk is a highly branched arabinoxylan, a polysaccharide with a xylan backbone and arabinose side chains, and it swells in water to a gel.












