Fiber

Which fiber lowers cholesterol the most?

Updated 4 Nov 2026

Short answer

No fiber is a clear winner. These are the LDL falls in separate reviews, each at a different dose and in different people, so they cannot be ranked directly:

  • Konjac glucomannan: 0.35 mmol/L at about 3 g a day, from only 370 people.[1]
  • Psyllium: 0.33 mmol/L at about 10.2 g a day.[2]
  • Barley beta-glucan: 0.25 mmol/L at about 6.5 g a day.[3]
  • Oat beta-glucan: 0.19 mmol/L at about 3.5 g a day.[4]

A 1999 review of 67 trials found no significant difference between soluble fiber from oats, psyllium and pectin.[5]

Viscous fiber, which makes the gut contents thicker, appears to matter. In healthy adults, interventions with viscous fibers and mixed plant fibers lowered cholesterol more often than others.[6] In one trial, oat beta-glucan lost half of its effect when its molecular weight was low.[7]

Regulators back some of these fibers. EFSA, the EU food safety authority, found that at least 3 g of oat beta-glucan a day lowers LDL cholesterol.[8] The US Food and Drug Administration allows a heart disease claim for soluble fiber from certain foods, with rules for oats, barley and psyllium husk.[9]

Sources (9)

  1. A systematic review and meta-analysis of randomized controlled trials of the effect of konjac glucomannan, a viscous soluble fiber, on LDL cholesterol and the new lipid targets non-HDL cholesterol and apolipoprotein B. Ho HVT, Jovanovski E, Zurbau A, Blanco Mejia S, Sievenpiper JL, Au-Yeung F, et al. Am J Clin Nutr, 2017. PMID 28356275
  2. 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. Jovanovski E, Yashpal S, Komishon A, Zurbau A, Blanco Mejia S, Ho HVT, et al. Am J Clin Nutr, 2018. PMID 30239559
  3. A systematic review and meta-analysis of randomized controlled trials of the effect of barley β-glucan on LDL-C, non-HDL-C and apoB for cardiovascular disease risk reduction(i-iv). Ho HV, Sievenpiper JL, Zurbau A, Blanco Mejia S, Jovanovski E, Au-Yeung F, et al. Eur J Clin Nutr, 2016. PMID 27273067
  4. The effect of oat β-glucan on LDL-cholesterol, non-HDL-cholesterol and apoB for CVD risk reduction: a systematic review and meta-analysis of randomised-controlled trials. Ho HV, Sievenpiper JL, Zurbau A, Blanco Mejia S, Jovanovski E, Au-Yeung F, et al. Br J Nutr, 2016. PMID 27724985
  5. Cholesterol-lowering effects of dietary fiber: a meta-analysis. Brown L, Rosner B, Willett WW, Sacks FM Am J Clin Nutr, 1999. PMID 9925120
  6. The Effect of Isolated and Synthetic Dietary Fibers on Markers of Metabolic Diseases in Human Intervention Studies: A Systematic Review. Armet AM, Deehan EC, Thöne JV, Hewko SJ, Walter J Adv Nutr, 2020. PMID 31342059
  7. Physicochemical properties of oat β-glucan influence its ability to reduce serum LDL cholesterol in humans: a randomized clinical trial. Wolever TM, Tosh SM, Gibbs AL, Brand-Miller J, Duncan AM, Hart V, et al. Am J Clin Nutr, 2010. PMID 20660224
  8. Scientific Opinion on the substantiation of a health claim related to oat beta glucan and lowering blood cholesterol and reduced risk of (coronary) heart disease. European Food Safety Authority, 2010. efsa.onlinelibrary.wiley.com
  9. Authorized Health Claims That Meet the Significant Scientific Agreement (SSA) Standard. US Food and Drug Administration, 2024. www.fda.gov

More about fiber

What is fiber?How does fiber lower cholesterol?How much fiber do you need per day?What is fiber used for?How long does fiber take to lower cholesterol?Is fiber safe?

For education; not medical advice. Talk to a doctor before you start, stop or change a supplement.