Psyllium is mainly used as a dietary fiber to relieve symptoms of both constipation and mild diarrhea and occasionally as a food thickener. Research has also shown benefits in reducing blood cholesterol levels.
The plant from which the seeds are extracted tolerates dry and cool climates and is mainly cultivated in northern India. Psyllium products are marketed under several brand names, such as Metamucil, Fybogel, Konsyl, and Lunelax.
Psyllium is mainly used as a dietary fiber, which is not absorbed by the small intestine. The purely mechanical action of psyllium mucilage is to absorb excess water while stimulating normal bowel elimination. Although its main use has been as a laxative, it is more appropriately termed a true dietary fiber and as such can help reduce the symptoms of both constipation and mild diarrhea. The laxative properties of psyllium are attributed to the fiber absorbing water and subsequently softening the stool. It however does increase flatulence to some degree.
High blood cholesterol
Psyllium fiber has been shown in studies to lower blood cholesterol and glucose levels while another common fiber, methylcellulose, has not shown these benefits. The use of soluble-fiber cereals is an effective and well-tolerated part of a prudent diet for the treatment of mild to moderate hypercholesterolemia. Although the cholesterol-reducing and glycemic-response properties of psyllium-containing foods are fairly well documented, the effect of long-term inclusion of psyllium in the diet has not been determined. Supplementation with fiber as ispaghula husk may have adverse effects on colorectal adenoma recurrence, especially in patients with high dietary calcium intake.
As a thickener, it has been used in ice cream and frozen desserts. A 1.5% weight/volume ratio of psyllium mucilage exhibits binding properties that are superior to a 10% weight/volume ratio of starch mucilage. The viscosity of psyllium mucilage dispersions are relatively unaffected between temperatures of 20 and 50 °C (68 and 122 °F), by pH from 2 to 10 and by salt (sodium chloride) concentrations up to 0.15 M. These physical properties, along with its status as a natural dietary fiber, may lead to increased use of psyllium by the food-processing industry. Technical-grade psyllium has been used as a hydrocolloidal agent to improve water retention for newly seeded grass areas, and to improve transplanting success with woody plants.
Gas or stomach cramping may also occur. It is recommended that this product be taken with a full glass of water to avoid it swelling in the throat and causing choking. Serious allergic reaction to this drug is rare. However, seek medical attention if any signs of anaphylaxis arise, such as a rash, itching/swelling, dizziness or difficulty breathing.
Mechanism of action
Psyllium is produced mainly for its mucilage content. The term mucilage describes a group of clear, colorless, gelling agents derived from plants. The mucilage obtained from psyllium comes from the seed coat. Mucilage is obtained by mechanical milling (i.e. grinding) of the outer layer of the seed. Mucilage yield amounts to about 25% (by weight) of the total seed yield. Plantago-seed mucilage is often referred to as husk, or psyllium husk. The milled seed mucilage is a white fibrous material that is hydrophilic, meaning that its molecular structure causes it to attract and bind to water. Upon absorbing water, the clear, colorless, mucilaginous gel that forms increases in volume by tenfold or more.
The genus Plantago contains over 200 species. P. ovata and P. psyllium are produced commercially in several European countries, the former Soviet Union and India. Plantago seed, known commercially as black, French, or Spanish psyllium, is obtained from P. psyllium L., also known as P. arenaria. Seed produced from P. ovata is known in trading circles as white or blonde psyllium, Indian plantago, or isabgol. Isabgol, (or ispaghol in Pakistan) the common name in India for P. ovata, comes from the Persian words asp and gul, meaning "horse flower", which is descriptive of the shape of the seed. India dominates the world market in the production and export of psyllium.
Plantago ovata is an annual herb that grows to a height of 30–46 cm (12–18 in). Leaves are opposite, linear or linear lanceolate 1 cm × 19 cm (0.39 in × 7.48 in). The root system has a well-developed tap root with few fibrous secondary roots. A large number of flowering shoots arise from the base of the plant. Flowers are numerous, small, and white. Plants flower about 60 days after planting. The seeds are enclosed in capsules that open at maturity.
The fields are generally irrigated prior to seeding to achieve ideal soil moisture, to enhance seed soil contact, and to avoid burying the seed too deeply as a result of later irrigations or rainfall. Maximum germination occurs at a seeding depth of 6 mm (1/4 in). Emerging seedlings are frost sensitive; therefore, planting should be delayed until conditions are expected to remain frost free. Seed is broadcast at 5.5 to 8.25 kg/hectare (5 to 7.5 lb/acre) in India. In Arizona trials, seeding rates of 22 to 27.5 kg/ha (20 to 25 lb/acre) resulted in stands of 1 plant/25mm (1 inch) in 15 cm (6 inch) rows produced excellent yields. Weed control is normally achieved by one or two hand weedings early in the growing season. Control of weeds by pre-plant irrigation that germinates weed seeds followed by shallow tillage may be effective on fields with minimal weed pressure. Psyllium is a poor competitor with most weed species.
The flower spikes turn reddish brown at ripening, the lower leaves dry and the upper leaves yellow. The crop is harvested in the morning after the dew is gone to minimize shattering and field losses. In India, mature plants are cut 15 cm above the ground and then bound, left for a few days to dry, thrashed, and winnowed.
Harvested seed must be dried to below 12% moisture to allow for cleaning, milling, and storage. Seed stored for future crops has shown a significant loss in viability after 2 years in storage.
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P. ovata is a 119- to 130-day crop that responds well to cool, dry weather. In India, P. ovata is cultivated mainly in North Gujarat as a "Rabi" or post–rainy season crop (October to March). During this season, which follows the monsoons, average temperatures are in the range of 15–30 °C (59–86 °F), and moisture is deficient. Isabgol (P. ovata), which has a moderate water requirement, is given 5 to 6 light irrigations. A very important environmental requirement of this crop is clear, sunny and dry weather preceding harvest. High night temperature and cloudy wet weather close to harvest have a large negative impact on yield. Rainfall on the mature crop may result in shattering and therefore major field losses.
Isabgol grows best on light, well drained, sandy loams. The nutrient requirements of the crop are low. In northern Gujarat, the soil tends to be low in nitrogen and phosphorus and high in potash with a pH between 7.2 and 7.9. Nitrogen trials under these conditions have shown a maximum seed yield response with the addition of 22 kg/hectare (20 lb/acre) of nitrogen.
Seed preparation and germination
P. ovata has small seeds; 1,000 seeds weigh less than 2 grams. Under ideal conditions of adequate moisture and low temperature 10 to 20 °C (50 to 68 °F), 30% of seeds germinate in 5 to 8 days. The seed shows some innate dormancy (3 months) following harvest. Attempts to eliminate this dormancy period by scarification, or by exposure to wet or dry heat, cold, ethylene, or carbon dioxide, are ineffective. Post-dormancy seeds show reliable germination in excess of 90% at 29 °C (84 °F), with lower rates of germination as temperature is increased.
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|Wikimedia Commons has media related to Psyllium.|
- USDA Plants Profile: Plantago ovata Forsk.
- USDA Germplasm Resources Information Network: Plantago ovata Forsk.
- CalPhotos: Plantago ovata
- ITIS Standard Report: Plantago ovata Forsk.
- National Institute of Health (NIH) Medline Plus: Psyllium (Plantago ovata, Plantago isphagula)
- USDA Plants Profile: Plantago psyllium L.
- USDA Germplasm Resources Information Network: Plantago psyllium L. (Plantago arenaria)