What Is Konjac (Glucomannan)? Safety, Risks & Alternatives

⚡ Quick Facts

E-NumberE425
FDA StatusFDA permits konjac as a food additive. However, FDA has issued warnings about choking hazards from konjac-based jelly cu…
EFSA StatusEFSA approved E425 with restrictions: banned in mini-cup jelly confections due to choking risk. EFSA approved a health c…
ADINo numerical ADI established
SeverityModerate Risk (6/10)

What Is Konjac (Glucomannan)?

A water-soluble dietary fiber extracted from the root (corm) of the konjac plant (Amorphophallus konjac), native to East and Southeast Asia. It has been used in Asian cuisine for over 2,000 years to make noodles (shirataki), jellies, and tofu-like foods. Konjac glucomannan is one of the most viscous known dietary fibers, capable of absorbing up to 50 times its weight in water.

Mechanism of Action

Glucomannan is a polysaccharide consisting of glucose and mannose units linked by beta-1,4-glycosidic bonds. When mixed with water, it forms a highly viscous gel that delays gastric emptying, slows glucose absorption, and binds bile acids — contributing to its cholesterol-lowering and blood-sugar-moderating effects. It is fermented by colonic bacteria into short-chain fatty acids, acting as a prebiotic fiber.

Why People Avoid Konjac (Glucomannan)

Regulatory Status

🇺🇸 FDA

FDA permits konjac as a food additive. However, FDA has issued warnings about choking hazards from konjac-based jelly cups (mini-cup gel candies). The FTC has challenged some health claims made for glucomannan supplements. Not GRAS-affirmed as of 2025.

🇪🇺 EFSA

EFSA approved E425 with restrictions: banned in mini-cup jelly confections due to choking risk. EFSA approved a health claim in 2010 that glucomannan contributes to weight loss when consumed at 3g/day as part of an energy-restricted diet. ADI not specified.

Regulatory Timeline

• Ancient — Used in traditional Chinese and Japanese cuisine for centuries
1997 EU initially restricts konjac in jelly confections after choking deaths
2002 EU bans konjac-containing mini-cup jellies (Directive 2002/46/EC)
2010 EFSA approves health claim for glucomannan and weight management
• 2020s — Growing popularity in low-calorie noodles and keto/low-carb products

Products Containing Konjac (Glucomannan) (1 found)

#ProductBrandScore
1GLUTEN FREE PASTA, FETTUCCINEThreadM8 by Bartolini76/100

Average safety score for products containing Konjac (Glucomannan): 76/100

Safer Alternatives

✅
Psyllium husk
✅
Guar gum
✅
Xanthan gum
✅
Agar
✅
Chia seeds (for thickening)

Scientific Sources

  1. EFSA (2010). Scientific Opinion on glucomannan and maintenance of normal blood cholesterol concentrations. EFSA Journal, 8(10), 1798
  2. Keithley & Swanson (2005). Glucomannan and obesity: a critical review. Alternative Therapies in Health and Medicine, 11(6), 30-34
  3. Chua et al. (2010). Konjac glucomannan — a review. Carbohydrate Polymers, 79(3), 486-496

Frequently Asked Questions

What is Konjac (Glucomannan)?
A water-soluble dietary fiber extracted from the root (corm) of the konjac plant (Amorphophallus konjac), native to East and Southeast Asia. It has been used in Asian cuisine for over 2,000 years to make noodles (shirataki), jellies, and tofu-like foods. Konjac glucomannan is one of the most viscous known dietary fibers, capable of absorbing up to 50 times its weight in water.
Is Konjac (Glucomannan) safe?
Konjac (Glucomannan) is FDA permits konjac as a food additive. However, FDA has issued warnings about choking hazards from k. EFSA approved E425 with restrictions: banned in mini-cup jelly confections due to choking risk. EFSA.
Where is Konjac (Glucomannan) banned?
Konjac (Glucomannan) is not currently banned in any major market according to our database.
What are alternatives to Konjac (Glucomannan)?
Safer alternatives to Konjac (Glucomannan) include: Psyllium husk, Guar gum, Xanthan gum, Agar, Chia seeds (for thickening).
How can I avoid Konjac (Glucomannan)?
Download CheckIt AI and scan any product's barcode or ingredient label. The app will flag Konjac (Glucomannan) and suggest safer alternatives.
What foods contain Konjac (Glucomannan)?
Konjac (Glucomannan) is commonly found in: Shirataki noodles, Konjac jelly snacks, Dietary fiber supplements, Low-calorie rice alternatives, Vegan seafood substitutes, Thickening agent in sauces. Our database has flagged it in 1 products.
What are the side effects of Konjac (Glucomannan)?
Concerns about Konjac (Glucomannan) include: Documented choking hazard — banned in mini-cup jelly form in EU, Australia, and other countries; Can cause esophageal or intestinal blockage if taken as supplement without adequate water; May cause bloating, gas, diarrhea, and abdominal discomfort.
Is Konjac (Glucomannan) natural or artificial?
Konjac (Glucomannan) is derived from natural sources. Glucomannan is a polysaccharide consisting of glucose and mannose units linked by beta-1,4-glycosidic bonds. When mixed .
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⚕️ This page provides ingredient information for educational purposes only. It is not medical advice. Consult a healthcare professional for personalized dietary guidance.

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📋 Cite This Data
APACheckIt AI. (2026). "What Is Konjac (Glucomannan)? Safety, Risks & Alternatives | CheckIt AI". Climaverse PBC. Retrieved from https://getcheck.it/ingredients/konjac
MLA"What Is Konjac (Glucomannan)? Safety, Risks & Alternatives | CheckIt AI." CheckIt AI, Climaverse PBC, 2026-03-05. https://getcheck.it/ingredients/konjac.
HTML Embed<a href="https://getcheck.it/ingredients/konjac">What Is Konjac (Glucomannan)? Safety, Risks & Alternatives | CheckIt AI — CheckIt AI</a>
BibTeX@misc{checkit2026ingredientskonjac, title = {What Is Konjac (Glucomannan)? Safety, Risks & Alternatives | CheckIt AI}, author = {CheckIt AI}, year = {2026}, publisher = {Climaverse PBC}, url = {https://getcheck.it/ingredients/konjac}, note = {Retrieved 2026-03-05} }