Health Notes


Also indexed as:Amorphophallus konjac, Fiber (Glucomannan)
Glucomannan: Main Image
Botanical names:
Amorphophallus konjac

Recommended Dosage

The amount of glucomannan shown to be effective as a laxative is 3–4 grams per day.1, 2 Effective amounts for lowering blood cholesterol have been 4–13 grams per day.3, 4, 5 For controlling blood sugar, 500–700 mg of glucomannan per 100 calories in the diet has been used successfully in controlled research.6, 7 For weight loss, 1 to 3 grams before each meal has been effective.8, 9 When using glucomannan and other dietary fibre supplements, it is best to start out with a small amount and increase gradually. It is recommended to drink at least 8 ounces of water each time any bulk-forming laxative, including glucomannan, is taken.


Glucomannan is a purified fibre from konjac root that is available as a bulk powder to be taken in hard-gelatine capsules or used as an ingredient in food.

Possible Deficiencies

As glucomannan is not an essential nutrient, no deficiency state exists.

Copyright © 2021 TraceGains, Inc. All rights reserved.

Learn more about TraceGains, the company.

The information presented by TraceGains is for informational purposes only. It is based on scientific studies (human, animal, or in vitro), clinical experience, or traditional usage as cited in each article. The results reported may not necessarily occur in all individuals. Self-treatment is not recommended for life-threatening conditions that require medical treatment under a doctor's care. For many of the conditions discussed, treatment with prescription or over the counter medication is also available. Consult your doctor, practitioner, and/or pharmacist for any health problem and before using any supplements or before making any changes in prescribed medications. Information expires December 2021.