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Moderate human evidenceSoluble viscous fiber
Psyllium husk
Psyllium is a viscous fiber used for bowel regularity and studied for cholesterol lowering. Its gel-forming behavior is not evidence that every fiber product has the same effects.
Also indexed as: Ispaghula · Plantago ovata · Psyllium
A clear starting point
Psyllium is a viscous fiber used for bowel regularity and studied for cholesterol lowering. Its gel-forming behavior is not evidence that every fiber product has the same effects.
Systems mapping shows biological relevance, not a treatment recommendation or a patient CPI score.
No validated chemical structure is displayed in this edition.
How it works
Intestinal viscosity / bowel and lipid-marker effects
Psyllium is a viscous fiber used for bowel regularity and studied for cholesterol lowering. Its gel-forming behavior is not evidence that every fiber product has the same effects.
- Targets & processes
- Physical gel-forming effects within intestinal contents, rather than a receptor agonist.
- Systems & tissues
- Intestinal contents and lipid metabolism.
What does the evidence show?
Human randomized trials support reductions in selected lipid markers. Psyllium also has established use as a bulk-forming fiber product.
What this does not establish
Lipid-marker changes are not cardiovascular-event trials. Results from psyllium do not apply to all dietary fibers.
The American journal of clinical nutrition · 2018 · Journal Article; Meta-Analysis; Systematic Review · PMID 30239559
Verified sample: 1,924 · Participants with or without hypercholesterolemia across 28 trials
Reductions in LDL cholesterol, non-HDL cholesterol and apolipoprotein B.
Limitations: Lipid-marker outcomes, not direct cardiovascular-event evidence.
Citation metadata from PubMed, a service of the U.S. National Library of Medicine, NIH. A citation match is not a guarantee of study quality. Abstracts are not full-text reviews.
Safety is a separate question
Bloating and allergic reactions can occur. Swallowing difficulty or inadequate fluid with bulk-forming products can create choking or obstruction risk; follow the specific product instructions.
Contraindications & cautions
Difficulty swallowing, intestinal obstruction or unexplained severe abdominal symptoms require assessment before use.
Medication & supplement interactions
Psyllium can alter absorption of oral medicines. Ask a pharmacist about the specific medicine and product.
Regulatory status · United States
United States: dietary-supplement status is product-specific, not FDA approval of disease treatment. Food, supplement and drug formulations must not be assumed interchangeable.
This is not an exhaustive safety list. Regulatory status varies by jurisdiction and product; investigational use is not approval.
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Education only. Confidence labels are not formal systematic evidence grades. No patient record is used.
Education only. Confidence labels are not formal systematic evidence grades. No patient record is used.