What is the recommended dosage for Glucomannan?

General: 1 g 3x/day (30-60 min before meals); Weight Management: 3-4 g/day with ample water

What are the side effects of Glucomannan?

Potential side effects include: Bloating and gas, Esophageal obstruction (if insufficient water), GI discomfort.

What is glucomannan and how may it support weight management?

Glucomannan is a water-soluble dietary fiber derived from the konjac root. It absorbs water and expands in the stomach, which may promote feelings of fullness. The European Food Safety Authority has authorized a health claim for glucomannan's contribution to weight loss in the context of an energy-restricted diet.

What dosage of glucomannan has been studied in clinical trials?

Clinical trials have typically used 1–3 grams of glucomannan per day, taken 15–30 minutes before meals with a full glass of water. The EFSA-authorized claim requires at least 3 grams daily in three doses of 1 gram each before meals.

What are the potential side effects of glucomannan?

Common side effects include bloating, flatulence, and loose stools. Glucomannan tablets may pose a choking hazard if they expand before reaching the stomach; capsule or powder forms with adequate water are preferred. It may reduce absorption of oral medications if taken simultaneously.

Glucomannan

fiber_satiety

Also known as: Konjac Root Fiber, Konjac Mannan, Amorphophallus konjac

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About

A water-soluble dietary fiber derived from konjac root that absorbs up to 50 times its weight in water, forming a viscous gel in the stomach. Glucomannan is the only dietary fiber with an EFSA-authorized health claim for supporting weight loss in the context of an energy-restricted diet.

How It Works

Water-soluble dietary fiber that absorbs up to 50 times its weight in water, forming a viscous gel in the stomach. This delays gastric emptying, prolongs satiety signals, and reduces postprandial glucose and insulin spikes. Also functions as a prebiotic, supporting beneficial gut bacteria that produce short-chain fatty acids (SCFAs).

Evidence For Conditions

Condition	Grade	Studies	Participants
Obesity	A	9	509	View →
Appetite Control	A	9	509	View →

Side Effects

Bloating and gas
Esophageal obstruction (if insufficient water)
GI discomfort

Drug & Supplement Interactions

May delay absorption of oral medications
Diabetes medications (may lower blood sugar)

Always inform your healthcare provider about all supplements you take.

Related Ingredients

5-HTP Chromium Psyllium White Kidney Bean Extract

Quick Facts

Dosage: General: 1 g 3x/day (30-60 min before meals); Weight_Management: 3-4 g/day with ample water
Forms: capsule powder konjac flour shirataki noodles
Natural Sources: Konjac root (elephant yam), Shirataki noodles
Upper Limit: 4 g/day; must be taken with 250+ mL water to prevent esophageal/GI obstruction
Best Time: 30-60 minutes before meals with a full glass of water

Evidence Summary

Obesity A

Appetite Control A

FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. The products and information on this website are not intended to diagnose, treat, cure, or prevent any disease. The evidence grades presented are based on our analysis of published peer-reviewed research and do not constitute medical advice. Always consult your healthcare provider before starting any supplement regimen.