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Fiber

Glucomannan

Glucomannan is a soluble dietary fiber from the root of the konjac plant (Amorphophallus konjac).

CardiovascularWeight ManagementGut Health

A measurable change in cholesterol

A 2017 analysis pooled 12 trials involving 370 adults and children. Glucomannan lowered LDL cholesterol by an average 0.35 mmol/L compared with control. Non-HDL cholesterol also fell, but apolipoprotein B did not improve in the six trials reporting it. These were cholesterol measurements, not evidence of fewer heart attacks. 1

Cholesterol balanceSupported

Lower LDL cholesterol in the pooled trials; cardiovascular events were not established. 1

Why do weight-loss claims and trial results differ?

NIH describes inconsistent results, including trials that found no significant weight difference from placebo. EFSA’s favorable assessment concerned overweight adults using at least 3 g daily in three doses before meals, with water and an energy-restricted diet. That context matters when interpreting a claim on a package. 2 3

Effects by health goal

Open an effect to see the studies behind its rating. Bars show the size of the effect; the letter grades the evidence.

Gut Health2 effects

Gut healthModerateBNo linked study

No study is linked to this rating.

Rated by SuppCo · medium confidenceEvidence record

Bloating & gas reliefGut HealthSmallCNo linked study

No study is linked to this rating.

Rated by SuppCo · medium confidenceEvidence record

Other effects1 effect

ConstipationStrongA3 studies
The effect of glucomannan on pregnancy constipation2018The role of glucomannan fiber in childhood functional constipation2016Fiber (glucomannan) is beneficial in the treatment of childhood constipation.2004

Rated by SuppCo · high confidenceEvidence record

All studies

8 publications are linked to Glucomannan, newest first.

Does glucomannan supplementation exert profitable effects on serum lipid profile in adults? A systematic review and meta-analysis.2024Effects of Glucomannan Supplementation on Type II Diabetes Mellitus in Humans: A Meta-Analysis2023The effect of Glucomannan on fasting and postprandial blood glucose in adults: a systematic review and meta-analysis of randomized controlled trials2022The effect of glucomannan on pregnancy constipation2018A 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.2017The role of glucomannan fiber in childhood functional constipation2016Effect of glucomannan on plasma lipid and glucose concentrations, body weight, and blood pressure: systematic review and meta-analysis.2008Fiber (glucomannan) is beneficial in the treatment of childhood constipation.2004

Sources