E425 · Konjac Gum
- WHO
- Use caution
- FDA
- Use caution
- EFSA
- Safe in moderation
- FSANZ
- Use caution
- Japan
- Safe
- UK FSA
- Use caution
- Health Canada
- Use caution
What is E425?
Konjac gum, primarily composed of glucomannan, is a polysaccharide derived from the corm of the konjac plant (Amorphophallus konjac). It is a highly viscous hydrocolloid used as a thickener, gelling agent, and emulsifier, especially in Asian foods such as shirataki noodles, tofu, and vegan desserts. Because of its high water-absorbing capacity, konjac-based jelly products (especially mini-cup jellies) have been linked to choking incidents, particularly in young children and older adults, and several countries restrict or ban them.
Also appears on labels as: Konjac gum, E425, E 425, E-425, Konjac mannan, Konjac glucomannan, Konjac flour, Amorphophallus konjac gum, Konjac root gum, KGM, Konjac polysaccharide, E425i (Konjac gum).
What the evidence says
- Choking hazard, particularly with mini-cup jellies or dry, unhydrated powder.
- Gastrointestinal discomfort (bloating, diarrhea) at high doses.
Frequently asked questions
Is E425 safe?
Our overall verdict for E425 (Konjac Gum) is “Use caution”, based on the most cautious of the major regulators’ positions — FDA: use caution; WHO: use caution; EFSA: safe in moderation; FSANZ: use caution; Japan: safe; UK FSA: use caution; Health Canada: use caution.
Is E425 vegan, halal or gluten-free?
According to our ingredient data for Konjac Gum — vegan: yes, vegetarian: yes, halal: yes, kosher: yes, gluten-free: yes, dairy-free: yes. Manufacturing sources can vary between products; check the label if it matters to you.
What is E425 and why is it used?
Konjac gum, primarily composed of glucomannan, is a polysaccharide derived from the corm of the konjac plant (Amorphophallus konjac). It is a highly viscous hydrocolloid used as a thickener, gelling agent, and emulsifier, especially in Asian foods such as shirataki noodles, tofu, and vegan desserts. Because of its high water-absorbing capacity, konjac-based jelly products (especially mini-cup jellies) have been linked to choking incidents, particularly in young children and older adults, and several countries restrict or ban them.
Does E425 contain allergens?
No known allergens are recorded for Konjac Gum, though some people report sensitivity (Possible digestive discomfort (bloating, gas) in large amounts., Choking hazard if not consumed with adequate liquid, especially in dry powder or certain jelly forms.).
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This page summarises publicly available regulatory assessments and research. It is general information, not medical advice. Sources: EFSA, FDA, WHO and the studies linked above.