Evidence explainerPsyllium

Psyllium Husk for Cholesterol: About 13 mg/dL Off LDL Across 28 Trials

Psyllium is one of the few supplements with both consistent trial data on LDL cholesterol and an FDA-authorized food-label health claim. Here is how big the effect is and what the claim actually says.

By Kymata Health editorial teamPublished October 9, 2026Last reviewed October 9, 2026

Medical review pending. Written by our editorial team from the studies cited below; a credentialed clinician has not reviewed it yet. Educational only, not medical advice.

Key takeaways

  • Across 28 trials (1,924 participants), a median of about 10.2 g/day of psyllium lowered LDL cholesterol by 0.33 mmol/L versus control [1].
  • Non-HDL cholesterol fell by 0.39 mmol/L and apoB by 0.05 g/L; certainty was moderate for LDL and high for apoB [1].
  • FDA's health-claim rule for psyllium specifies 7 g or more per day of soluble fiber from psyllium seed husk, as part of a diet low in saturated fat and cholesterol [2].
  • Across 11 trials (592 participants), systolic blood pressure fell by 2.04 mmHg [3].

The evidence, graded

Pulled from our monograph evidence tables. Grades follow our evidence-grading policy.

  • Grade AWorsenedLDL cholesterol, non-HDL cholesterol and apoBPsyllium · Meta-analysis · n=1,924 · 2018 · PMID 30239559LDL cholesterol fell by 0.33 mmol/L, non-HDL cholesterol by 0.39 mmol/L and apoB by 0.05 g/L versus control. Certainty was moderate for LDL and non-HDL (downgraded for inconsistency) and high for apoB.
  • Grade CWorsenedSystolic blood pressurePsyllium · Meta-analysis · n=592 · 2020 · PMID 32066221Systolic blood pressure fell by 2.04 mmHg; the effect was stronger in people with higher starting blood pressure.

How much LDL drops

A 2018 meta-analysis of 28 randomized trials (1,924 participants, with or without high cholesterol) found that psyllium at a median of about 10.2 g/day lowered LDL cholesterol by 0.33 mmol/L, non-HDL cholesterol by 0.39 mmol/L and apoB by 0.05 g/L versus control [1].

In US units, 0.33 mmol/L is roughly 13 mg/dL (our conversion). Certainty was rated moderate for LDL and non-HDL, downgraded for inconsistency, and high for apoB [1].

What FDA's health claim allows

Under 21 CFR 101.81, foods can carry a claim linking soluble fiber from psyllium seed husk, as part of a diet low in saturated fat and cholesterol, to heart health [2]. The rule specifies 7 g or more per day of soluble fiber from psyllium husk, from foods supplying at least 1.7 g per serving [2].

That is a food-labeling claim about diets, not an approval of psyllium as a medicine [2].

Blood pressure and blood sugar

A 2020 meta-analysis of 11 trials (592 participants) found systolic pressure fell by 2.04 mmHg, more in people starting higher [3]. A 2024 meta-analysis of 19 trials (962 adults) found fasting blood sugar fell by 6.89 mg/dL; HbA1c was not significantly lower at under 10 g/day [4].

Taking it safely

FDA-required directions say to take or mix psyllium with at least 8 ounces of water or other fluid, because too little fluid may cause it to swell and cause choking [5]. People already on cholesterol, blood-pressure or blood-sugar medicines should check with a pharmacist first. See psyllium husk side effects.

Quick answers

How much psyllium was used in cholesterol trials?

The 28 trials used a median of about 10.2 g/day [1]. FDA's claim rule is based on 7 g or more per day of soluble fiber from psyllium husk [2].

How fast does psyllium lower cholesterol?

The pooled abstract does not report trial lengths, so our sources cannot say how quickly the effect appears [1].

Does psyllium raise HDL?

The meta-analysis reports LDL, non-HDL and apoB reductions; it does not report an HDL change in its abstract [1].

Keep reading

Full monographs

Related articles

Browse the full Supplement & Nutrient Encyclopedia or all supplement articles.

References

  1. [1]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. Am J Clin Nutr, 2018. PMID 30239559
  2. [2]21 CFR 101.81 Health claims: Soluble fiber from certain foods and risk of coronary heart disease (CHD) (eCFR, up to date as of 2026-10-07). U.S. Food and Drug Administration (Code of Federal Regulations), 2023.
  3. [3]The effect of psyllium supplementation on blood pressure: a systematic review and meta-analysis of randomized controlled trials. Korean J Intern Med, 2020. PMID 32066221
  4. [4]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 Endocr Disord, 2024. PMID 38844885
  5. [5]21 CFR 201.319 Water-soluble gums, hydrophilic gums, and hydrophilic mucilloids ... required warnings and directions (eCFR, up to date as of 2026-10-07). U.S. Food and Drug Administration (Code of Federal Regulations), 2007.

Psyllium and other dietary supplements are not intended to diagnose, treat, cure or prevent any disease, and these statements have not been evaluated by the FDA. Talk to your clinician or pharmacist before starting a supplement, especially if you take prescription medicines. This page has no product or affiliate links.