Glucomannan
12 benefits mapped to clinical evidence across supplements.
Dose per serving from products
99 products in our catalogue print how much Glucomannan a serving holds.
Most common: 1 g to 2.5 g, 22% of 99 products.
| Dose per serving | Products |
|---|---|
| 25 mg or less | 1 |
| 25 mg to 50 mg | 20 |
| 50 mg to 100 mg | 10 |
| 100 mg to 250 mg | 19 |
| 250 mg to 500 mg | 13 |
| 500 mg to 1 g | 14 |
| 1 g to 2.5 g | 22 |
Dose per serving from research
26 study groups in 20 studies say how much Glucomannan participants took a day.
These are the doses the studies gave. They are not a recommendation.
Most common: 2.5 g to 5 g, 62% of 26 study groups.
| Daily dose | Study groups |
|---|---|
| 1 g or less | 2 |
| 1 g to 2.5 g | 6 |
| 2.5 g to 5 g | 16 |
| 5 g to 10 g | 2 |
Benefit Evidence
Bowel frequency +30%
Stool consistency, pain ↓
Gut bacteria, SCFAs ↑
Research sources
Bowel regularity (7)
- Experiences with three different fiber supplements in weight reduction
PubMed ID: 15614200
Study used glucomannan-containing fiber supplements and demonstrated weight loss—clear representation of fiber supplementation.
- Gummies candy enriched with Konjac glucomannan reduces hunger intensity and waist circumference of overweight individuals
PubMed ID: 36435474
Intervention used konjac glucomannan gummies (a plant-derived soluble fiber), consistent with a natural fiber boost.
- Effect of plant sterols and glucomannan on lipids in individuals with and without type II diabetes
PubMed ID: 16391591
Glucomannan reduced cholesterol consistent with soluble fiber effects.
- Impact of Combined Prebiotic Galacto-Oligosaccharides and Bifidobacterium breve-Derived Postbiotic on Gut Microbiota and HbA1c in Prediabetic Adults: A Double-Blind, Randomized, Placebo-Controlled Study
PubMed ID: 39064648
Prebiotic/fiber blend containing konjac improved microbiota and glycemic markers—consistent with fiber action.
- Efficacy of rifaximin on symptoms of uncomplicated diverticular disease of the colon. A pilot multicentre open trial. Diverticular Disease Study Group
PubMed ID: 1330083
Open trial in diverticular disease reported symptomatic improvement that included stool-related symptoms.
- [Use of glucomannan dietary fiber in changes in intestinal habit]
PubMed ID: 8566676
Konjac glucomannan is a soluble viscous fiber; the RCT demonstrates classic fiber effects (increased stool frequency, improved consistency).
- Fiber (glucomannan) is beneficial in the treatment of childhood constipation
PubMed ID: 14993586
Higher treatment success for children with constipation compared with placebo.
Cholesterol (7)
- Effect of plant sterols and glucomannan on lipids in individuals with and without type II diabetes
PubMed ID: 16391591
Randomized crossover: glucomannan alone reduced total and LDL cholesterol substantially.
- Evaluation of the pharmacotherapeutic efficacy of Garcinia cambogia plus Amorphophallus konjac for the treatment of obesity
PubMed ID: 18729243
Combination product lowered total and LDL cholesterol substantially; glucomannan was a component but not sole agent.
- Effect of short-term ingestion of konjac glucomannan on serum cholesterol in healthy men
PubMed ID: 7872224
Well-powered crossover trial showed significant reductions in total cholesterol, LDL and triglycerides.
- Effect of dietary supplementation with glucomannan on plasma total cholesterol and low density lipoprotein cholesterol in hypercholesterolemic children
PubMed ID: 15955465
Hypercholesterolemic children: large decreases in TC and LDL when glucomannan added to diet.
- Effects of a carbohydrate-restricted diet with and without supplemental soluble fiber on plasma low-density lipoprotein cholesterol and other clinical markers of cardiovascular risk
PubMed ID: 17161227
Konjac added to a low-carb diet sped LDL reduction early; many lipid changes were diet-driven.
- Effect of two doses of a mixture of soluble fibres on body weight and metabolic variables in overweight or obese patients: a randomised trial
PubMed ID: 18031592
Soluble-fiber mix including glucomannan modestly lowered LDL in overweight/obese adults.
- Could dyslipidemic children benefit from glucomannan intake?
PubMed ID: 23759268
In children with primary hypercholesterolemia, twice-daily glucomannan modestly lowered TC, LDL and non-HDL cholesterol.
Weight management (6)
- [Chronic use of glucomannan in the dietary treatment of severe obesity]
PubMed ID: 1313163
Severely obese patients lost more fat mass and had metabolic improvements when glucomannan added to low-calorie diet.
- Gummies candy enriched with Konjac glucomannan reduces hunger intensity and waist circumference of overweight individuals
PubMed ID: 36435474
14-day trial showed reduced waist circumference and hunger, suggesting potential short-term weight-control benefits though no long-term weight data.
- The Impact of Glucomannan, Inulin, and Psyllium Supplementation (Soloways(TM)) on Weight Loss in Adults with FTO, LEP, LEPR, and MC4R Polymorphisms: A Randomized, Double-Blind, Placebo-Controlled Trial
PubMed ID: 38398881
180-day RCT with fiber combination including glucomannan produced substantially greater weight and fat loss vs placebo.
- [The use of highly purified glucomannan-based fibers in childhood obesity]
PubMed ID: 1324483
In obese children, adding purified glucomannan to diet reduced excess weight and triglycerides vs controls.
- Experiences with three different fiber supplements in weight reduction
PubMed ID: 15614200
Glucomannan-containing fiber supplements (with calorie restriction) produced ~0.8 kg/week greater weight loss over 5 weeks.
- [Evaluation of the action of glucomannan on metabolic parameters and on the sensation of satiation in overweight and obese patients]
PubMed ID: 7796558
Small trial reported greater weight loss and metabolic improvements with glucomannan + low-calorie diet vs diet alone.
Heart health (6)
- Could dyslipidemic children benefit from glucomannan intake?
PubMed ID: 23759268
Crossover trial in children: modest but significant reductions in TC and LDL.
- Effect of short-term ingestion of konjac glucomannan on serum cholesterol in healthy men
PubMed ID: 7872224
Crossover trial showed reductions in total cholesterol, LDL and triglycerides and slight systolic BP reduction.
- Effect of dietary supplementation with glucomannan on plasma total cholesterol and low density lipoprotein cholesterol in hypercholesterolemic children
PubMed ID: 15955465
Hypercholesterolemic children: substantial total and LDL cholesterol lowering when glucomannan added to diet.
- Effect of two doses of a mixture of soluble fibres on body weight and metabolic variables in overweight or obese patients: a randomised trial
PubMed ID: 18031592
Large RCT with mixed soluble fiber (includes glucomannan): modest LDL lowering and increased satiety.
- Co-administration of a konjac-based fibre blend and American ginseng (Panax quinquefolius L.) on glycaemic control and serum lipids in type 2 diabetes: a randomized controlled, cross-over clinical trial
PubMed ID: 28687934
Konjac-based fiber blend (with ginseng) lowered A1c and LDL/ApoB in T2D; glucomannan likely contributed but product combined.
- Effect of plant sterols and glucomannan on lipids in individuals with and without type II diabetes
PubMed ID: 16391591
Randomized crossover: meaningful reductions in total and LDL cholesterol with glucomannan.
Digestive support (4)
- Efficacy of rifaximin on symptoms of uncomplicated diverticular disease of the colon. A pilot multicentre open trial. Diverticular Disease Study Group
PubMed ID: 1330083
Open trial in diverticular disease reported large symptomatic score reductions with glucomannan.
- Efficacy of rifaximin in the treatment of symptomatic diverticular disease of the colon. A multicentre double-blind placebo-controlled trial
PubMed ID: 7766741
Study used glucomannan as background therapy and ~40% were symptom-free on glucomannan alone, indicating symptomatic benefit.
- [Use of glucomannan dietary fiber in changes in intestinal habit]
PubMed ID: 8566676
Dose-response trial documented increased bowel-movement frequency and improved stool consistency.
- Fiber (glucomannan) is beneficial in the treatment of childhood constipation
PubMed ID: 14993586
Higher physician- and parent-rated treatment success for constipation compared with placebo.
Satiety (4)
- Gummies candy enriched with Konjac glucomannan reduces hunger intensity and waist circumference of overweight individuals
PubMed ID: 36435474
Double-blind RCT reported reduced hunger intensity after 14 days of low‑dose KGM gummies.
- Effect of two doses of a mixture of soluble fibres on body weight and metabolic variables in overweight or obese patients: a randomised trial
PubMed ID: 18031592
Mixed soluble-fiber RCT including 1 g glucomannan per dose increased postprandial fullness.
- [Evaluation of the action of glucomannan on metabolic parameters and on the sensation of satiation in overweight and obese patients]
PubMed ID: 7796558
Small trial reported improved satiety with glucomannan added to a low-calorie diet.
- The Impact of Glucomannan, Inulin, and Psyllium Supplementation (Soloways(TM)) on Weight Loss in Adults with FTO, LEP, LEPR, and MC4R Polymorphisms: A Randomized, Double-Blind, Placebo-Controlled Trial
PubMed ID: 38398881
180-day RCT of a fiber combo including glucomannan reduced appetite and produced greater weight/fat loss vs placebo.
Metabolism (4)
- Experiences with three different fiber supplements in weight reduction
PubMed ID: 15614200
Large RCT: glucomannan-containing supplements produced clinically meaningful weight loss versus control.
- [Chronic use of glucomannan in the dietary treatment of severe obesity]
PubMed ID: 1313163
Study in severely obese patients showed greater fat loss and improved carbohydrate tolerance when glucomannan added to diet.
- Co-administration of a konjac-based fibre blend and American ginseng (Panax quinquefolius L.) on glycaemic control and serum lipids in type 2 diabetes: a randomized controlled, cross-over clinical trial
PubMed ID: 28687934
Konjac-based fiber blend plus ginseng lowered HbA1c and atherogenic lipids in T2D (combined product).
- Efficacy of different fibres and flour mixes in South-Asian flatbreads for reducing post-prandial glucose responses in healthy adults
PubMed ID: 27324141
Konjac added to flatbreads markedly reduced post-meal glycaemia—relevant to metabolic control.
Blood sugar (3)
- Co-administration of a konjac-based fibre blend and American ginseng (Panax quinquefolius L.) on glycaemic control and serum lipids in type 2 diabetes: a randomized controlled, cross-over clinical trial
PubMed ID: 28687934
Konjac-based fiber blend (with ginseng) lowered HbA1c in T2D over 12 weeks (combined product).
- Efficacy of different fibres and flour mixes in South-Asian flatbreads for reducing post-prandial glucose responses in healthy adults
PubMed ID: 27324141
Dose-dependent, marked reductions in postprandial glucose iAUC and Cmax when konjac mannan added to flatbreads.
- Impact of Combined Prebiotic Galacto-Oligosaccharides and Bifidobacterium breve-Derived Postbiotic on Gut Microbiota and HbA1c in Prediabetic Adults: A Double-Blind, Randomized, Placebo-Controlled Study
PubMed ID: 39064648
12-week multi-fiber supplement including konjac reduced HbA1c and fasting plasma glucose in prediabetics.
Appetite suppression (2)
- Gummies candy enriched with Konjac glucomannan reduces hunger intensity and waist circumference of overweight individuals
PubMed ID: 36435474
Reported reduced hunger intensity after 14 days, supporting appetite-suppressing effects.
- The Impact of Glucomannan, Inulin, and Psyllium Supplementation (Soloways(TM)) on Weight Loss in Adults with FTO, LEP, LEPR, and MC4R Polymorphisms: A Randomized, Double-Blind, Placebo-Controlled Trial
PubMed ID: 38398881
Long RCT with fiber blend including glucomannan reported appetite suppression vs placebo.
Bloating & gas (1)
- Efficacy of rifaximin on symptoms of uncomplicated diverticular disease of the colon. A pilot multicentre open trial. Diverticular Disease Study Group
PubMed ID: 1330083
Symptom score reductions in diverticular disease likely encompassed bloating reductions.
Detoxification (1)
- Efficacy of rifaximin on symptoms of uncomplicated diverticular disease of the colon. A pilot multicentre open trial. Diverticular Disease Study Group
PubMed ID: 1330083
Symptom improvements in diverticular disease and beneficial fecal marker changes suggest a mild cleansing/conditioning effect.
Gut health (1)
- Impact of Combined Prebiotic Galacto-Oligosaccharides and Bifidobacterium breve-Derived Postbiotic on Gut Microbiota and HbA1c in Prediabetic Adults: A Double-Blind, Randomized, Placebo-Controlled Study
PubMed ID: 39064648
Prebiotic/fiber blend containing konjac improved alpha diversity and shifted microbiota in prediabetic adults.
Similar by evidence
Supplements the same benefits carry qualifying findings for — a fact about the evidence graph, not a recommendation to swap.
Products with Glucomannan
Search all332 products whose verified label declares Glucomannan — not every bottle that mentions it in a title.