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fiber psyllium husk

Fiber Psyllium Husk (Psyllium) is a dietary supplement.

Psyllium

Not yet rated· sourced from the FDA label
Rated against independent regulatory sources·Last updated June 23, 2026·How we rate
Verified againstopenFDANIH DailyMedRxClass
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Key facts

Active ingredient
Psyllium
Type
Supplement

What is Fiber Psyllium Husk?

From the FDA label:Soluble fiber supporting regularity, cholesterol, and satiety.

What the evidence says

Limited evidence

What Fiber Psyllium Husk is

Psyllium husk is the outer seed coating of the Plantago ovata plant and is used as a source of soluble dietary fiber. MedlinePlus explains that soluble fiber draws in water and forms a gel during digestion, which slows digestion, and it lists psyllium as a common soluble-fiber supplement. Psyllium is sold as powders, capsules, and wafers and is a frequent ingredient in over-the-counter bulk-forming fiber products.

Commonly used for

Taken as a daily soluble-fiber supplement to help meet fiber intakeUsed by some people for occasional constipation and bowel regularityUsed as a bulk-forming fiber productUsed by some people who want to support heart health through soluble fiberUsed to add bulk and a feeling of fullness to the diet

What the evidence shows

There is no dedicated NIH Office of Dietary Supplements or NCCIH fact sheet for psyllium, so government-authority efficacy summaries specific to psyllium are limited. The cited MedlinePlus encyclopedia article uses cautious wording, stating that "some types of soluble fiber may help lower risk of heart disease" — a possibility, not a guarantee — and the MedlinePlus dietary fiber topic notes that fiber "helps digestion and helps prevent constipation." Beyond these general statements about soluble and dietary fiber, this monograph makes no claim that psyllium treats, prevents, or cures any specific disease.

Typical dosage

The cited government health pages do not give a specific psyllium dose, so follow the directions on the product label, which generally tell you to mix the fiber into a full glass of water or other liquid before taking it. MedlinePlus advises adding fiber to your diet gradually rather than all at once. Talk with a doctor, pharmacist, or other clinician before starting psyllium, especially if you have a medical condition, take medications, or are pregnant or breastfeeding.

Safety

Psyllium should be taken with enough fluid. Product labeling and general consumer guidance (rather than the cited MedlinePlus pages) warn that swallowing it without adequate liquid may cause it to swell and block the throat or esophagus, so this caution is not drawn from a government source. People who have trouble swallowing or a history of bowel narrowing or obstruction should be especially careful and seek medical advice first. MedlinePlus does state that you should use laxatives only if your health care provider says you should, so check with a clinician before relying on psyllium as a laxative.

Side effects

According to MedlinePlus, increasing dietary fiber too quickly can cause gas, bloating, and cramps, which is why fiber should be added gradually. Some people may also react to psyllium with allergy-type symptoms, though this is noted as a general precaution and is not described on the cited MedlinePlus pages. Stop use and seek medical care if you have signs of an allergic reaction or any trouble breathing or swallowing.

Interactions & cautions

Because psyllium forms a gel and slows digestion, it may affect how the body absorbs some oral medications and nutrients; as a general precaution often given on product labels, take psyllium a couple of hours apart from other medicines. The cited government health pages do not provide a psyllium drug-interaction list, so this guidance is general rather than source-backed — ask a pharmacist or clinician before combining psyllium with prescription medications, including diabetes or cholesterol drugs.

Sources

This statement has not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. Summarized from public health authorities; general reference, not medical advice. Talk to a licensed healthcare professional before starting any supplement.

Ways to save

Ask for the generic

Same active ingredient, far cheaper. Is there a generic? →

Request a 90-day supply

Bulk fills usually lower the per-dose price vs monthly refills.

Use copay cards

Manufacturer copay cards & patient-assistance programs — especially for brand drugs.

Compare alternatives

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Information is sourced from public FDA regulatory data. Provided for general reference only — not medical advice. Always consult a licensed professional and the current prescribing information.

What people report to the FDA about Psyllium

The FDA Adverse Event Reporting System (FAERS) collects reports from patients and clinicians. It holds 4,199 reports naming Psyllium — the active ingredient in Fiber Psyllium Husk, and the FDA flagged 77% of those reports as serious. The effects reported most often — leaving out reports about overdose, misuse or the condition being treated, which dominate the raw list for common medicines:

  • constipation460 reports
  • headache388 reports
  • fatigue386 reports
  • hypertension309 reports
  • diarrhoea308 reports
  • dyspnoea296 reports
  • nausea295 reports
  • pyrexia274 reports

Read these as a signal, not a rate. A report does not mean Psyllium caused the effect — anyone can file one, and many describe people taking several medicines for several conditions. Crucially there is no denominator: FAERS does not record how many people took the drug, so these counts cannot be turned into “X% of patients” — a bigger number often just means a more widely used or more talked-about drug. Duplicates exist, and publicity drives reporting. For what is actually established, read the FDA label.

Source: openFDA drug/event (FAERS), retrieved September 26, 2026.

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