Open Food Labels. Search 352 ingredients⌘K

E425Carrier · Emulsifier · Humectant · Stabiliser · Thickener

Konjac

What the research shows

Prototype

Conflicting

studies in people disagree or haven’t settled it

3 health findings on this page · See the findings

Used in food as a carrier, emulsifier, humectant, stabiliser or thickener.

  • Vegan
  • Vegetarian
  • EU permitted

What research says

Studies in people

  • Concern

    Gut comfort1

    Some adults taking konjac daily for 12 weeks had stomach upset, diarrhoea or constipation.

  • Benefit

    Blood fat levels2

    In people, eating konjac with rice porridge lowered blood fats and changed fat-processing proteins.

Animal and lab studies only

  • Benefit

    Blood sugar in diabetes4

    In animal studies, konjac glucomannan lowered blood sugar and blood fats in rats with type 2 diabetes.

Study type not stated

  • Benefit

    Blood sugar and cholesterol3

    Konjac is a fiber that may help lower blood sugar, cholesterol, and blood pressure, and support weight loss.

The signal at the top counts the findings in people and in animal and lab studies. A concern in studies of people outranks animal and lab studies, and “No concerns” needs at least two findings in people. Findings whose study type is not stated are shown but not counted. This page is a reference, not medical advice. It describes what regulators and published research say. Talk to a doctor or dietitian about your own diet.

Regulatory status

Checked Sep 2026

Status reflects the named register on the date checked. It is not a safety rating. A country appears here once we've found this ingredient on its official list.

How we check

Products

The 6 most-scanned of 533 products on Open Food Facts that list konjac.

  • This isn't pork sausages This · 270 g 6 additives
  • Noodles Bare naked foods · 250 g 1 additive
  • Caramelised Onion Sausages This Isn’t Pork · 270 g 5 additives
  • This isn’t beef burgers This isn't · 2 x 113 g 5 additives
  • Veganer Aufschnitt Mortadella-Art Vemondo · 125 g 3 additives
  • Plant-based shrimpiee Happiee! · 180 g 5 additives

References

  1. 1Mortensen A, Aguilar F, Crebelli R, et al. Re-evaluation of konjac gum (E 425 i) and konjac glucomannan (E 425 ii) as food additives. EFSA J. 2017;15(6):e04864. doi:10.2903/j.efsa.2017.4864
  2. 2Nagasawa T, Kimura T, Yoshida A, et al. Konjac Glucomannan Attenuated Triglyceride Metabolism during Rice Gruel Tolerance Test. Nutrients. 2021;13(7). doi:10.3390/nu13072191
  3. 3Devaraj RD, Reddy CK, Xu B. Health-promoting effects of konjac glucomannan and its practical applications: A critical review. Int J Biol Macromol. 2019;126:273-281. doi:10.1016/j.ijbiomac.2018.12.203
  4. 4Chen H, Nie Q, Hu J, et al. Hypoglycemic and Hypolipidemic Effects of Glucomannan Extracted from Konjac on Type 2 Diabetic Rats. J Agric Food Chem. 2019;67(18):5278-5288. doi:10.1021/acs.jafc.9b01192