Table of Contents

  1. Simple Report
  2. Detailed Report
  3. Overall Effectiveness Rating
  4. Research Rating
  5. Products Containing Glucomannan
  6. Claim Ratings
  7. Dosing
  8. References

Glucomannan Simple Report

  • Supplement: Glucomannan
  • Supplement Category: fibers
  • Number of Products Containing Glucomannan: 3
  • Effectiveness Rating: 1.8 out of 3
  • Research Rating: 40 (above 80 indicates sufficient research)
  • Number of Studies: 4
  • Number of Claims: 10
  • Effective Dosage Range: 1.2 - 3.9 grams per day

Glucomannan Detailed Report

Overall Effectiveness Rating

The overall effectiveness rating for glucomannan is 1.8 out of 3. This rating means the evidence is mixed on the supplement's ability to deliver positive results. While some of the research supports its use, other evidence does not. Using this supplement may lead to positive results. Note, this effectiveness rating is for glucomannan as a whole; there are also individual ratings for the claims below.

Read more: What is the effectiveness rating?

Research Rating for Glucomannan

There are 4 studies in the database on glucomannan; the research rating is 40. A score above 80 means the effectiveness rating for this supplement is reliable. A score under 80 means there is insufficient evidence to ensure a reliable effectiveness rating. Note, this research rating is for glucomannan as a whole; there are also individual ratings for the claims below.

Read more: What is the research rating?

Products Containing Glucomannan

Products Names Amount of Glucomannan
Nano Shred Deluxe 350mg
Nano Shred Max 350mg
Instant Knock Out 1.8g
Full list of all 3 products containing Glucomannan.

Claim Ratings

The overall ratings above are an average of the individual claim ratings below. Individual claims may have higher or lower ratings compared to the supplement's overall rating. For example, some supplements may have excellent backing for one claim, but be completely useless for another. Click on a claim below for more information.

Body Composition (weight, muscle, body fat) Claims Effectiveness Rating Research Rating
decrease body fat
increase weight loss

Energy Balance (calories in & calories out) Claims Effectiveness Rating Research Rating
increase satiety
decrease calorie intake

Cardiovascular Health Claims Effectiveness Rating Research Rating
lower blood pressure
lower LDL (bad) cholesterol levels
increase HDL (good) cholesterol levels
lower total cholesterol levels
lower triglyceride levels

General Health Claims Effectiveness Rating Research Rating
lower fasting glucose


The Supplement Database includes 4 studies on glucomannan dosing. These studies indicate an effective dose ranges from 1.2 to 3.9 grams per day, the average dose being 3.44 grams per day. For a more detailed dosing analysis visit: Supplement Dosing for Glucomannan.


Title of Study
A Glucomannan and Chitosan Fiber Supplement Decreases Plasma Cholesterol and Increases Cholesterol Excretion in Overweight Normocholesterolemic Humans
Effect of short-term ingestion of konjac glucomannan on serum cholesterol in healthy men
Konjac Supplement Alleviated Hypercholesterolemia and Hyperglycemia in Type 2 Diabetic Subjects—A Randomized Double-Blind Trial
Safety and Efficacy of Glucomannan for Weight Loss in Overweight and Moderately Obese Adults