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Psyllium husk

A fiber from the seed coats of the plant Plantago ovata that swells into a gel in water. It has been studied for constipation, cholesterol, blood sugar and IBS.

Explained simply · Last reviewed 2026-09-26

What it is

Psyllium husk is a fiber made from the seed coats of the plant Plantago ovata. The European Medicines Agency, which calls it ispaghula husk, says the plant is cultivated or gathered to obtain its seeds. The agency's herbal committee reports that the husk is mostly water-soluble fiber, able to absorb up to 40 times its own weight in water. Mixed with water, the agency says, it forms a gel-like mass that works as a mild laxative.

More about Psyllium husk

The European Medicines Agency, which calls it ispaghula husk, says the plant is cultivated or gathered to obtain its seeds. The agency's herbal committee reports that the husk is mostly water-soluble fiber, able to absorb up to 40 times its own weight in water. Mixed with water, the agency says, it forms a gel-like mass that works as a mild laxative.

In the EU, the agency's herbal committee has assessed it as a herbal medicine: for constipation; for softening stools when passing them is painful, as with anal fissures, hemorrhoids or after surgery to the anus or rectum; for raising daily fiber intake; and alongside diet for high blood cholesterol. In the US, federal regulations cover psyllium in over-the-counter bulk laxatives, and in foods carrying a health claim about soluble fiber and heart disease. Both the European agency and US regulations stress taking it with enough liquid; see the safety section.

The research summarized below covers LDL cholesterol, chronic constipation, blood sugar and irritable bowel syndrome (IBS).

Also known as: psyllium, ispaghula husk, ispaghula, Plantago ovata seed husk

At a glance

Safety: known risks, 9 groups who should avoid it or take extra care and 4 documented interactions. See Safety ↓

Claims made about Psyllium husk, and how strong the evidence is for each:

Lowers LDL cholesterolEvidence rating: Moderate
Relieves chronic constipationEvidence rating: Limited
Improves blood sugar controlEvidence rating: Limited
Relieves irritable bowel syndrome (IBS) symptomsEvidence rating: Limited

Each rating follows our published rules and the sources cited for it. We don’t add our own medical judgment. How we rate

Safety

Read this before the ratings below.

Risks

Choking: the European Medicines Agency states that when taken with inadequate fluid, bulk-forming agents can cause obstruction of the throat and esophagus with choking, and intestinal obstruction. It lists chest pain, vomiting, and difficulty swallowing or breathing as possible symptoms.
Choking warnings on US laxatives: US regulations require over-the-counter bulk-laxative medicines containing psyllium, sold dry or not fully hydrated, to carry this warning: “Taking this product without adequate fluid may cause it to swell and block your throat or esophagus and may cause choking. Do not take this product if you have difficulty in swallowing. If you experience chest pain, vomiting, or difficulty in swallowing or breathing after taking this product, seek immediate medical attention”.
Choking notices on some US foods: under US food labeling rules, foods containing dry or incompletely hydrated psyllium husk that carry the heart-disease health claim must generally carry a similar choking notice, for example: “Eating this product without enough liquid may cause choking. Do not eat this product if you have difficulty in swallowing.” A product in conventional food form may be exempt if it does not form a viscous adhesive mass when exposed to fluids.
Gut effects: the European Medicines Agency reports that flatulence may occur and generally disappears as treatment continues, and that bloating, blockage of the gut or esophagus, and fecal impaction (a build-up of hard, dry stool) may occur, particularly if it is swallowed with insufficient fluid. A US gastroenterology guideline describes flatulence as a commonly observed side effect of fiber.
Allergy: the European Medicines Agency states that ispaghula contains potent allergens, and that exposure by mouth, through the skin, or by breathing in the powder can cause allergic reactions such as a runny nose, conjunctivitis, bronchospasm and, in some cases, anaphylaxis. It also lists skin rash and itching among reported reactions.
Breathing in the powder: the European Medicines Agency states that people in continued contact with the powder at work, such as healthcare workers and caregivers, may become sensitized by inhaling it, more often if they are atopic, and that this usually leads to hypersensitivity reactions which could be serious. It advises trying to avoid inhaling the powder when preparing a dose.
Overdose: the European Medicines Agency states that too much may cause abdominal discomfort, flatulence and intestinal obstruction.

Who should avoid it or take extra care

People who have difficulty swallowing or any throat problems, or diseases of the esophagus: the European Medicines Agency lists these as reasons not to use it.
People with a narrowed gut, a blocked or potentially blocked bowel, a paralysed bowel, or megacolon: the European Medicines Agency lists these as reasons not to use it.
A sudden change in bowel habit lasting more than 2 weeks, undiagnosed rectal bleeding, or failure to pass a stool after taking a laxative: the European Medicines Agency lists these as reasons not to use it.
Fecal impaction with abdominal pain, nausea and vomiting: the European Medicines Agency states it should not be used unless a doctor advises it, because these can be signs of a blocked bowel. If abdominal pain or any change in stools occurs while taking it, the agency advises stopping and seeking medical advice.
Anyone allergic to psyllium, or sensitized to it: the European Medicines Agency states that exposure should be stopped immediately and avoided in future.
Frail or elderly people: the European Medicines Agency states their treatment requires medical supervision.
Children: the European Medicines Agency does not recommend it for constipation under 6 years of age, or for increasing fiber intake under 12 years of age, because there is not enough data on how well it works.
Pregnancy and breastfeeding: the European Medicines Agency reports limited data, from fewer than 300 pregnancy outcomes, and states that use may be considered during pregnancy and breastfeeding if necessary and if a change of diet has not worked.
High cholesterol: the European Medicines Agency states that using it alongside diet for high cholesterol requires medical supervision.

Documented interactions

Medicines taken at the same time, such as minerals, vitamin B12, cardiac glycosides, coumarin derivatives, carbamazepine and lithium: The European Medicines Agency states that it may delay how these are absorbed from the gut, and advises not taking it within half an hour to one hour of other medicines. Source [1]
Diabetes medicines: The European Medicines Agency states that people with diabetes should take it only under medical supervision, because their diabetes treatment may need adjusting. Source [1]
Thyroid hormones: The European Medicines Agency states that taking it alongside thyroid hormones requires medical supervision, because the thyroid hormone dose may need adjusting. Source [1]
Medicines that slow gut movement (for example opioids): To reduce the risk of a blocked bowel, the European Medicines Agency states it should be used with these medicines only under medical supervision. Source [1]

Safety sources: Source [1]Source [2]Source [3]Source [4]Source [5]

What the evidence says

Each claim is rated on its own evidence. Ratings follow the scale on our methodology page.

Lowers LDL cholesterol Evidence rating: Moderate
People with high cholesterol take it hoping it will bring their LDL cholesterol down.
A 2018 review of 28 trials found psyllium lowered LDL cholesterol, at moderate certainty; the EU's herbal medicines committee noted in 2013 a lack of studies of cardiovascular events or deaths.
A 2018 meta-analysis pooled 28 randomized trials in 1,924 people, with and without high cholesterol. Compared with control, psyllium lowered LDL cholesterol by an average of 0.33 mmol/L. It also lowered non-HDL cholesterol and apolipoprotein B. The reviewers graded how sure they could be (certainty) as moderate for LDL and non-HDL cholesterol, downgraded for inconsistency between trials. They graded it high for apolipoprotein B. Two of the ten meta-analysis authors disclose ties to companies, and a third holds patents on the medical use of a viscous fiber blend.

The European Medicines Agency's herbal committee accepts psyllium husk as an add-on to diet in high cholesterol. It reports an LDL reduction of approximately 7% in mild to moderate high cholesterol, and states that this use requires medical supervision.

US FDA regulations authorize foods containing qualifying psyllium husk to carry a health claim. Its model wording is: “Soluble fiber from foods such as [name of soluble fiber source …], as part of a diet low in saturated fat and cholesterol, may reduce the risk of heart disease.” The regulation allows the claim to describe the link as working “through the intermediate link of ‘blood cholesterol’”, and requires that it not attribute any degree of risk reduction.

In 2013, the European Medicines Agency's herbal committee noted that studies of psyllium's effect on cardiovascular events and total mortality were not available.

Sources: Source [1]Source [2]Source [3]
Relieves chronic constipation Evidence rating: Limited
People with long-term constipation take it hoping it will get their bowels moving more regularly.
A 2023 US guideline found psyllium may increase weekly bowel movements and overall relief, at low certainty; it calls psyllium's data the best among the fibers it assessed, but still low quality.
A 2023 guideline from two US gastroenterology societies suggests fiber supplements for adults with chronic constipation. It is a conditional recommendation, on low-certainty evidence. Among the fiber supplements it evaluated, the guideline states that only psyllium appears to be effective, with very limited and uncertain data on bran and inulin. Pooling three psyllium trials run between 1986 and 1995, it found psyllium may increase the number of bowel movements a week and may increase global relief of symptoms. It found little to no difference in stool consistency.

The guideline rated certainty low for bowel movements, global relief and serious adverse events, and very low for diarrhea, because of risk of bias, indirectness and imprecision. One of the three trials tested a capsule combining celandine, aloe vera and psyllium. The global-relief result pools only two trials, one of them that blend. The guideline notes that at least two fiber studies used products with other ingredients, such as milk or aloe vera, which it says could also affect bowel movements. It states: “The best data exist for psyllium, but even those are of low quality.”

A 2022 meta-analysis of 16 trials concluded that fiber is effective at improving constipation, with psyllium among the fibers showing significant effects. But it found no included study at low risk of bias. It advised caution because results differed considerably from trial to trial (heterogeneity). Two of its authors disclose research funding from industry sources, including food companies.

The European Medicines Agency's herbal committee accepts psyllium husk for habitual constipation on the basis of 'well-established use'. That is a regulatory category meaning published data show its effectiveness and safety in this use over at least 10 years in the EU; it is not a certainty grade.

Several members of the 2023 guideline panel disclose ties to drug companies; the guideline states it was funded wholly by the two societies, with no support from industry. The limited rating reflects low certainty in the evidence, not a finding of no effect.

Sources: Source [1]Source [2]Source [3]Source [4]
Improves blood sugar control Evidence rating: Limited
People take it hoping it will help keep their blood sugar in check.
A 2024 review of 19 trials found lower fasting blood sugar and HbA1c with psyllium, at moderate certainty, but no significant change in insulin, at low certainty.
A 2024 meta-analysis pooled 19 randomized trials in 962 adults. Compared with placebo, psyllium lowered fasting blood sugar, HbA1c (a measure of longer-term blood sugar) and HOMA-IR (a measure of insulin resistance). It did not significantly change insulin levels. The reviewers rated certainty moderate for fasting blood sugar, HbA1c and HOMA-IR, and low for insulin.

The trials included people with and without diabetes, and the review does not report results for type 2 diabetes separately. The review therefore does not show how much of the effect applies to people with type 2 diabetes. The authors list among the limitations that most included studies were very small, used varying psyllium types, doses and durations, and were of low quality. They add that differences between trials in several results went unexplained.

Separately, the European Medicines Agency's herbal committee states that people with diabetes should take psyllium husk only under medical supervision, because their diabetes treatment may need adjusting.

This page's rating follows the lowest of the review's certainty grades, low for insulin.

Sources: Source [1]Source [2]
Relieves irritable bowel syndrome (IBS) symptoms Evidence rating: Limited
People with IBS take it hoping it will ease their symptoms.
A 2021 US guideline advises soluble fiber such as psyllium for overall IBS symptoms, on moderate-quality evidence; the EU's herbal medicines committee found benefit only in IBS with constipation.
A 2021 American College of Gastroenterology guideline advises soluble, but not insoluble, fiber for overall IBS symptoms. It grades this a strong recommendation on moderate quality of evidence. It cites a meta-analysis in which psyllium (ispaghula) benefited IBS symptoms across 7 trials with 499 patients, while bran did not. All seven authors of the guideline disclose ties to drug companies; the guideline reports no financial support.

The European Medicines Agency's herbal committee reached a narrower conclusion in 2013. The studies it assessed did not show an effect on IBS itself, but showed benefit in patients who also had constipation. It accepts psyllium husk only as an add-on in constipation-predominant IBS.

The sources disagree, and where they do this site uses the lower rating.

Sources: Source [1]Source [2]Source [3]

How and when to take it

What the cited sources say about taking it. Ask your doctor or pharmacist what applies to you.

Always take it with plenty of liquid
The European Medicines Agency states that a sufficient amount of liquid should always be taken with it and that adequate fluid intake has to be maintained. Taken with too little fluid, bulk-forming agents like psyllium can block the throat or esophagus and cause choking. US food labeling rules give, as an example of the notice required on foods carrying the psyllium health claim: “This food should be eaten with at least a full glass of liquid.” Source [1]Source [2]
Keep it apart from other medicines
The European Medicines Agency advises taking it during the day, at least half an hour to one hour before or after other medicines, because it can delay how some medicines are absorbed. Source [1]Source [2]
Do not take it just before bed
The European Medicines Agency advises against taking it immediately before bedtime. Source [1]Source [2]
See a doctor or pharmacist if constipation lasts
For constipation, the European Medicines Agency advises consulting a doctor or pharmacist if symptoms persist for longer than 3 days while taking it. Source [1]

Which form the evidence used

Supplements are sold in several forms. This is what the sources on this page say about them — which form the research used, and any comparison those sources themselves made. Where they made none, this page does not rank the forms.

Psyllium husk on its own (powder, granules, or capsules), What the sources supportDetails
The European Medicines Agency's assessment covers the husk of Plantago ovata seeds, used as it is or powdered, and the cholesterol meta-analysis cited below studied psyllium (Plantago ovata) fiber. No source cited here compared powder against capsules, or one brand against another, so this page cannot say that any of them works better. Source [1]Source [2]
Psyllium stirred into water, or baked into foods, What the sources supportDetails
The cholesterol meta-analysis compared these directly for LDL cholesterol. Trials giving psyllium in water (18 trials, 1,386 participants) and trials giving it baked into foods such as cookies, cereal or bread (13 trials, 538 participants) showed similar reductions, with no significant difference between them. This is the only comparison of forms made by any source cited here, and it covers LDL cholesterol only. Source [1]
Blends that combine psyllium with other active ingredients, Details
The US constipation guideline records that one of the three psyllium trials it pooled used a capsule combining celandine, aloe vera and psyllium. It also notes that at least two fiber studies used products with other ingredients, such as milk or aloe vera, which it says could also affect bowel movements. Results from a blend cannot be separated from the effect of its other ingredients. Source [1]

Sources

Effect of psyllium (Plantago ovata) fiber on LDL cholesterol and alternative lipid targets, non-HDL cholesterol and apolipoprotein B: a systematic review and meta-analysis of randomized controlled trials
The American Journal of Clinical Nutrition, 2018 · Meta-analysis · Primary source · Certainty: moderate
Some of its authors disclose ties to industry.
Community herbal monograph on Plantago ovata Forssk., seminis tegumentum
European Medicines Agency, Committee on Herbal Medicinal Products (HMPC), 2013 · Health authority summary · Primary source
21 CFR 101.81 — Health claims: Soluble fiber from certain foods and risk of coronary heart disease (CHD)
US Food and Drug Administration, Code of Federal Regulations (eCFR), 2023 · Health authority summary · Primary source
American Gastroenterological Association-American College of Gastroenterology Clinical Practice Guideline: Pharmacological Management of Chronic Idiopathic Constipation
Gastroenterology, 2023 · Clinical practice guideline · Primary source · Certainty: very low
Some of its authors disclose ties to industry.
The Effect of Fiber Supplementation on Chronic Constipation in Adults: An Updated Systematic Review and Meta-Analysis of Randomized Controlled Trials
The American Journal of Clinical Nutrition, 2022 · Meta-analysis · Primary source
Some of its authors disclose ties to industry.
Herbal medicine: summary for the public — Ispaghula husk (Plantago ovata Forssk., seminis tegumentum)
European Medicines Agency, Committee on Herbal Medicinal Products (HMPC), 2013 · Health authority summary · Primary source
The effect of psyllium on fasting blood sugar, HbA1c, HOMA IR, and insulin control: a GRADE-assessed systematic review and meta-analysis of randomized controlled trials
BMC Endocrine Disorders, 2024 · Meta-analysis · Primary source · Certainty: low
ACG Clinical Guideline: Management of Irritable Bowel Syndrome
The American Journal of Gastroenterology, 2021 · Clinical practice guideline · Primary source · Certainty: moderate
Some of its authors disclose ties to industry.
21 CFR 201.319 — Water-soluble gums, hydrophilic gums, and hydrophilic mucilloids (including, but not limited to agar, alginic acid, calcium polycarbophil, carboxymethylcellulose sodium, carrageenan, chondrus, glucomannan ((B-1,4 linked) polymannose acetate), guar gum, karaya gum, kelp, methylcellulose, plantago seed (psyllium), polycarbophil tragacanth, and xanthan gum) as active ingredients; required warnings and directions
US Food and Drug Administration, Code of Federal Regulations (eCFR), 2007 · Health authority summary · Primary source
21 CFR 101.17 — Food labeling warning, notice, and safe handling statements
US Food and Drug Administration, Code of Federal Regulations (eCFR), 2020 · Health authority summary · Primary source

Page history

Show all 3 changes to this page

2026-09-28 — Rewritten to the content style guideline; ratings and sources unchanged.
2026-09-26 — Source audit. The 2026 Gastroenterology meta-analysis of fiber in IBS was removed, with the one sentence reporting it, because its full text could not be read; the IBS rating stays limited. The link to the 2021 American College of Gastroenterology guideline now points to its DOI.
2026-09-23 — Published. All four claims, the safety section and every source passed the site's source and wording reviews. Guideline source typing and the unread Staudacher 2026 full text stay logged in docs/08-open-decisions.md.