Psyllium Husk
Also known as: Plantago ovata, Ispaghula, Metamucil® fibre
Psyllium is composed of highly branched arabinoxylan that hydrates into a viscous gel in the small intestine. Unlike most viscous fibres it is only partially fermented in the colon, retaining water-holding capacity throughout the GI tract.
Last reviewed: 2025-01-15 · 3 indexed studies
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Overview
A soluble, gel-forming fibre from the seed husks of Plantago ovata with an unusually strong evidence base across three independent outcomes: cholesterol lowering, blood-sugar smoothing, and bowel regularity. Recognised by the FDA and EFSA for cholesterol health claims.
Mechanism & Function
Mechanism of Action
Forms a viscous gel that (1) binds bile acids, forcing hepatic LDL receptor upregulation and lowering serum LDL-C, (2) slows gastric emptying and glucose absorption, smoothing post-prandial glycaemia, and (3) normalises stool form by adding bulk and retaining water.
Physiological Role
Compensates for low dietary fibre intake; clinically meaningful effects achievable at modest doses.
Primary Pathways
Performance / Health Relevance
Smooths post-prandial glycaemia which can support steady energy availability; indirect cardiometabolic benefits relevant to long-term athletic health.
Evidence Review
Practical Use & Dosage
- Minimum Effective Dose
- 5 g/day
- Optimal Range
- 10–20 g/day (split into 2–3 doses)
- Upper / Caution Level
- 30 g/day (risk of GI obstruction without adequate fluid)
- Timing
- Mixed in 250+ mL water immediately before consumption; 15–30 min before meals for glycaemic benefit
- Best Format
- Powder (preferred), capsule (requires many capsules for effective dose), or wafer
- Bioavailability
- Hydration is critical — under-hydrated psyllium can cause obstruction.
- Absorption Considerations
- Take medications 1 hour before or 2 hours after psyllium to avoid reduced drug absorption.
Safety & Interactions
Side Effects
- •Bloating and gas (first 1–2 weeks)
- •Choking/obstruction risk if taken with insufficient water
Contraindications
- Bowel obstruction or stricture
- Difficulty swallowing
Drug Interactions
- •May reduce absorption of lithium, carbamazepine, levothyroxine, oral contraceptives, warfarin — separate dosing
Who Should Avoid
- •Patients with oesophageal stricture or swallowing difficulties
Monitoring
Ensure ≥250 mL fluid per dose; introduce gradually.
Frequently Asked Questions
Auto-generated from indexed evidence — dosage, safety, interactions, and more.
When is Psyllium Husk typically used or indicated?
Psyllium Husk is most commonly used for: Constipation, LDL cholesterol reduction, Glycaemic control, IBS regularity, Satiety. Compensates for low dietary fibre intake; clinically meaningful effects achievable at modest doses.
How does Psyllium Husk work?
Forms a viscous gel that (1) binds bile acids, forcing hepatic LDL receptor upregulation and lowering serum LDL-C, (2) slows gastric emptying and glucose absorption, smoothing post-prandial glycaemia, and (3) normalises stool form by adding bulk and retaining water.
What is the recommended dose of Psyllium Husk?
The optimal range is 10–20 g/day (split into 2–3 doses). with a minimum effective dose of 5 g/day. Best taken: Mixed in 250+ mL water immediately before consumption; 15–30 min before meals for glycaemic benefit. Upper / caution level: 30 g/day (risk of GI obstruction without adequate fluid).
What are the side effects of Psyllium Husk?
Reported side effects include: Bloating and gas (first 1–2 weeks); and Choking/obstruction risk if taken with insufficient water. Monitoring: Ensure ≥250 mL fluid per dose; introduce gradually.
Does Psyllium Husk interact with medications?
Known or theoretical interactions: May reduce absorption of lithium, carbamazepine, levothyroxine, oral contraceptives, warfarin — separate dosing. Always check with a clinician before combining with prescription medication.
Who should avoid Psyllium Husk?
Psyllium Husk is generally not recommended for: Patients with oesophageal stricture or swallowing difficulties; Bowel obstruction or stricture; and Difficulty swallowing.
How strong is the evidence for Psyllium Husk?
Evidence level: Strong (overall score 88/100), based on 3 indexed studies on SuppIndex.
Research & References (3)
Effect of psyllium fiber on LDL cholesterol: a systematic review and meta-analysis
Jovanovski E et al. Meta-analysis of 28 RCTs (n=1924) — 10.2 g/day psyllium reduced LDL-C by 0.33 mmol/L (≈7%) and non-HDL-C by 0.36 mmol/L.
Soluble fiber and risk of type 2 diabetes: a meta-analysis
Gibb RD et al. Psyllium significantly improved fasting glucose and HbA1c in type 2 diabetics (35 RCTs).
Long-term effects of regular intake of psyllium on bowel function in IBS-C
Bijkerk CJ et al. 12-week RCT in primary care IBS — psyllium significantly improved symptom severity vs placebo.
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Lactase Enzyme
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Research Overview
Strong EvidenceCite this ingredient
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Stable URL
https://thesuppindex.com/ingredients/psyllium-husk
SuppIndex. (2026). Psyllium Husk: Evidence summary, dosage and clinical studies. Retrieved October 16, 2026, from https://thesuppindex.com/ingredients/psyllium-husk
Based on 3 indexed studies · Evidence level: Strong.
Goal Ratings
Stack Compatibility
Pairs with probiotics for synbiotic effect; separate from time-sensitive medications.