Psyllium husk
Content by: OpenSupplement Editorial Team | Medical review: pending | Last updated: April 13, 2026
TL;DR
Bulk-forming soluble fiber derived from the seeds of Plantago ovata
High evidence for lowering LDL cholesterol and improving blood sugar
One of the best-studied supplements for cardiovascular risk reduction
Extremely safe; acts as a prebiotic for gut health
Very cheap: ~$5-10/month
Best for: High cholesterol, constipation, metabolic syndrome
What it is
Psyllium husk is a soluble fiber that turns into a gel when mixed with water. This 'gel' is the secret to its health benefits. In the gut, it binds to bile acids (which are made of cholesterol) and pulls them out of the body, forcing the liver to use up more blood cholesterol to make new ones.
It also slows down the digestion of carbohydrates, leading to a much flatter blood sugar curve after meals. It is a foundational tool for both digestive and metabolic health.
What the research says
The FDA allows a heart-health claim for psyllium because the evidence is so strong. Cholesterol. Meta-analyses show that 10g of psyllium daily can lower LDL ('bad') cholesterol by 7-10%. Blood Pressure. It also shows a modest but consistent ability to lower blood pressure, particularly in people with hypertension. Verdict. It is one of the most effective 'food-based' ways to improve your lipid profile. [1][3]
Psyllium is an excellent tool for glycemic control. Blood Sugar. A large meta-analysis in the American Journal of Clinical Nutrition found that psyllium significantly improved fasting blood glucose and HbA1c in people being treated for Type 2 diabetes. Satiety. The bulking effect helps you feel full longer, which can support weight management. Recommendation. Take it before your largest meal for the best metabolic results. [2]
DISCLAIMER: The information on this page is for educational purposes only and has not been evaluated by the Food and Drug Administration. This content is not intended to diagnose, treat, cure, or prevent any disease. Consult a qualified healthcare professional before using any dietary supplement, especially if you are pregnant, nursing, taking medication, or have a medical condition.
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Psyllium husk on Amazon
Safety
Extremely safe, but you MUST drink plenty of water (at least 8oz per dose) to prevent choking or constipation. Some users experience gas and bloating when first starting; start with a small dose and increase slowly over two weeks.
Interactions
- Medications: Psyllium can slow the absorption of any oral drug. Take medications either 1 hour before or 2-4 hours after psyllium.
- Lithium: May lower blood levels of lithium.
Dosing
Standard Dose: 5-10 grams (roughly 1 rounded tablespoon) daily. Timing: 15-30 minutes before a meal. Form: Whole husk or powder mixed in water or juice. Avoid the sugar-laden 'orange flavored' supermarket brands if possible.
Cost
Very cheap. A large bag costs $5-10 and lasts over a month.
The bottom line
Psyllium is 'unsexy' but incredibly effective. It's a low-cost, high-yield supplement for anyone looking to improve their heart health and blood sugar.
References
- Wei ZH, Wang H, Chen XY, et al. Time- and dose-dependent effect of psyllium on serum lipids in mild-to-moderate hypercholesterolemia: a meta-analysis of controlled clinical trials. Eur J Clin Nutr. 2009;63(7):821-827.
- Gibb RD, McRorie JW Jr, Russell DA, et al. Psyllium fiber improves glycemic control proportional to loss of glycemic control: a meta-analysis of data in euglycemic subjects, patients at risk of type 2 diabetes mellitus, and patients being treated for type 2 diabetes mellitus. Am J Clin Nutr. 2015;102(6):1604-1614.
- Anderson JW, Allgood LD, Lawrence A, et al. Cholesterol-lowering effects of psyllium intake adjunctive to diet therapy in men and women with hypercholesterolemia: meta-analysis of 8 controlled trials. Am J Clin Nutr. 2000;71(2):472-479.
Sources for this page include published meta-analyses, systematic reviews, and NIH dietary supplement fact sheets. All claims reflect the evidence as of early 2026.
This is not medical advice. Consult your healthcare provider before starting any supplement, especially if you take medications.