Psyllium is a source of soluble fibre and as such, it has been shown to slow the absorption of sugar, making it a staple for diabetics. Incorporating soluble fibre into their diet prevents dangerous spikes in sugar levels after meals. Psyllium, as a source of soluble fibre, also binds excess cholesterol, prevents its absorption and aids in its elimination. Many cholesterol lowering agents that lower "bad" cholesterol (LDL, VLDL) have the same effect on "good" cholesterol (HDL). Psyllium is one of the few substances that does not have a detrimental effect on HDL, while lowering LDL cholesterol levels. The FDA has recognized Psyllium as an herb that reduces cholesterol, therefore also reducing the risk of heart disease, still the leading cause of death in Canada and United States.

Psyllium is not digested, but stimulates digestive processes through purely mechanical means. In the intestines, psyllium creates a large, soft, slimy mass (sounds yummy, right?) that travels through the intestines triggering contractions, coating the walls, slowing digestion and therefore regulating the rate of absorption. It is these effects that make it an excellent complimentary treatment for hemorrhoids (often caused or worsened by constipation), IBD, colon cancer, high cholesterol, diabetes, high blood pressure, obesity and heart disease.

Psyllium tends to have less gas and bloating effects than similar products, including bran. Recommended dosages of psyllium vary greatly, but in general for any concern, a dose of 7 – 30 g/day is adequate. It is very important to increase your water and fluid intake at the same time as increasing your psyllium intake, to avoid painful and dangerous bowel obstructions.

Psyllium allergies are possible, so be cautious if using for the first time. Rash, hives, difficulty breathing or anaphylaxis can develop in sensitive individuals. Diabetics taking insulin medication as well as psyllium should monitor their blood sugar regularly, as regular psyllium intake may require a lower dosage of medication. It is advised that psyllium be taken at least 1 hour away from supplements and prescription medication to avoid a possible decrease in absorption that delayed gastric emptying may cause.