Plantaginaceae
Plantago ovata
Psyllium · Isabgol · Blond plantain
- Part used
- seed
- Native range
- The Mediterranean, western and southern Asia; grown commercially chiefly in India
- Morphology
- A small annual to about thirty centimetres with narrow leaves and dense short spikes of tiny flowers, producing seeds whose husk swells enormously in water.
What is in it
Evidence
Among the best-evidenced entries in this collection. Good evidence as a bulk laxative, in irritable bowel syndrome, and for modest reductions in LDL cholesterol and blood glucose. It appears in clinical guidance and is recommended by gastroenterologists.
Safety
Must be taken with plenty of fluid — obstruction and choking are documented when it is not. Occupational allergy is well described in workers handling the powder. Otherwise very safe, and used long term without difficulty.
Interactions: Slows absorption of other oral drugs; separate doses by a couple of hours
Regulatory: Permitted as a food and as a listed medicine ingredient; also a registered medicine in some forms.
How the traditions classify it
Three systems, rating the same plant. Where they disagree, none of them is correcting the others — they are separate frameworks that arrived at their categories independently.
Historical use
Long used across Persia, India and the Mediterranean as a bulk laxative and demulcent.
Recorded as history and attributed where possible. Long use establishes that a plant was widely used, not that it worked, and not that it was safe.
Worth knowing
Psyllium is the quiet counter-example to almost everything else in this section: a traditional plant remedy that works, is recommended by mainstream clinicians, has excellent trial evidence, and is completely unglamorous.
It is instructive about what tends to survive testing. The successful entries in this collection are overwhelmingly the ones with simple physical mechanisms — bulk, mucilage, a defined antimicrobial on a surface, a smooth-muscle relaxant — rather than the ones claiming to tonify, balance, purify or support a system. The vaguer the claim, the worse it does.
Nomenclature verified against GBIF backbone taxonomy.