Glucomannan (konjac mannan): authorised health claims in Great Britain

Short answer. There are 2 authorised health claims for Glucomannan (konjac mannan) on the Great Britain nutrition and health claims register (published 19 May 2026). Each can be used only if your product meets its conditions of use, and in its authorised wording or wording with the same meaning.

The authorised claims, word for word

Authorised claim	Conditions of use
Glucomannan contributes to the maintenance of normal blood cholesterol levels	The claim may be used only for food which provides a daily intake of 4 g of glucomannan. In order to bear the claim information shall be given to the consumer that the beneficial effect is obtained with a daily intake of 4 g of glucomannan. Warning of choking to be given for people with swallowing difficulties or when ingesting with inadequate fluid intake - advice on taking with plenty of water to ensure substance reaches stomach.
Glucomannan in the context of an energy restricted diet contributes to weight loss	The claim may be used only for food which contains 1 g of glucomannan per quantified portion. In order to bear the claim information shall be given to the consumer that the beneficial effect is obtained with a daily intake of 3 g of glucomannan in three doses of 1 g each, together with 1-2 glasses of water, before meals and in the context of an energy-restricted diet. Warning of choking to be given for people with swallowing difficulties or when ingesting with inadequate fluid intake - advice on taking with plenty of water to ensure substance reaches stomach.

Authorised claim

Conditions of use

Glucomannan contributes to the maintenance of normal blood cholesterol levels

The claim may be used only for food which provides a daily intake of 4 g of glucomannan. In order to bear the claim information shall be given to the consumer that the beneficial effect is obtained with a daily intake of 4 g of glucomannan. Warning of choking to be given for people with swallowing difficulties or when ingesting with inadequate fluid intake - advice on taking with plenty of water to ensure substance reaches stomach.

Glucomannan in the context of an energy restricted diet contributes to weight loss

The claim may be used only for food which contains 1 g of glucomannan per quantified portion. In order to bear the claim information shall be given to the consumer that the beneficial effect is obtained with a daily intake of 3 g of glucomannan in three doses of 1 g each, together with 1-2 glasses of water, before meals and in the context of an energy-restricted diet. Warning of choking to be given for people with swallowing difficulties or when ingesting with inadequate fluid intake - advice on taking with plenty of water to ensure substance reaches stomach.

The claims and conditions are copied from the register. Where the register contradicts itself and the correct reading is shown instead, our note beside the row says so. Check the register itself before you rely on a claim: it is updated from time to time.

Source

Great Britain nutrition and health claims (NHC) register, Department of Health and Social Care, published 19 May 2026. Contains public sector information licensed under the Open Government Licence v3.0.

Not legal advice. Last updated: 1 November 2026.