What can you say about glucomannan in your ads and on your site?

The library supports 3 wordings for glucomannan; the strongest is “Helps maintain normal blood cholesterol levels” (strong, 3-4.5 g a day). Avoid wording that names or implies a disease, a drug or a treatment, such as “Lowers cholesterol”.

Also called: Konjac glucomannan, Konjac mannan, Konjac

Reviewed 14 October 2026

Not legal advice. This guide shows the wording that published evidence supports at a daily dose, from the sources linked below; it is not a ruling on any claim. Your own product, its form and dose, and your own evidence still need to match the wording you use.

Supported wordings

What you can say.

Strong evidenceWording 1

Claims Facts

“Helps maintain normal blood cholesterol levels.”

Daily dose	3-4.5 g a day
Support	Authorized in the EU after EFSA review at 4 g a day, and Health Canada lists a cholesterol use at 3-4.5 g a day.
Dose details	EU: 4 g a day, and the consumer is told so. Health Canada: 1-1.5 g three times a day, 30-60 minutes before meals, with professional advice for use beyond 8 weeks. Adults 18 and older.
Form	Glucomannan
Sources	Commission Regulation (EU) No 432/2012, list of permitted health claims Health Canada monograph: Glucomannan

Moderate evidenceWording 2

Claims Facts

“Helps with weight loss as part of a calorie-restricted diet.”

Daily dose	at least 3 g a day
Support	Authorized in the EU after EFSA review; Health Canada does not list it.
Dose details	EU: 3 g a day, as three 1 g doses with 1-2 glasses of water before meals, within an energy-restricted diet.
Form	Glucomannan
Source	Commission Regulation (EU) No 432/2012, list of permitted health claims

Moderate evidenceWording 3

Claims Facts

“Promotes regular bowel movements and helps relieve occasional constipation.”

Daily dose	1.5-15 g a day
Support	Health Canada lists bulk-forming bowel uses; FDA’s 2000 rule counts the ‘occasional constipation’ form as structure-and-function wording.
Dose details	Health Canada: 0.5-5 g three times a day; effects in 12-24 hours, may take 2-3 days. Labeling should make clear the product is not meant for chronic constipation.
Form	Glucomannan
Source	Health Canada monograph: Glucomannan

How strong the evidence is

Strong evidence: At least two listed sources support it independently at a comparable dose and form, and none disagrees.
Moderate evidence: One listed source supports it as an evidence-based use at that dose, and no listed source disagrees.
Limited evidence: The only support is traditional use, the sources disagree, or the source itself calls the evidence weak.

Wordings to avoid

What to leave out.

Claims Facts

Ingredient: Glucomannan

Wording to avoid	Reason
“Lowers cholesterol”FDA’s 2000 rule gives ‘lowers cholesterol’ as an example of a disease claim; the supported wording is maintaining normal levels.	Disease
“Controls blood sugar in diabetes”Names a disease; Health Canada asks people with diabetes to check with a practitioner first.	Disease
“Relieves constipation, without ‘occasional’”FDA’s 2000 rule clears only the ‘occasional’ form.	Treatment

Disease: names or implies a disease. Drug: names a drug or presents the product as one. Treatment: promises to treat, cure or prevent a condition.

Sources

Where this comes from.

All ingredient guides

Check the claims on your own site. Free.

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