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WeightCited

Glucomannan for Obesity

A

EFSA health claim: 'contributes to weight loss in the context of an energy-restricted diet.' Glucomannan is the only dietary fiber with an EU-approved weight-loss health claim. Meta-analysis confirms statistically significant body weight reduction.

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The Bottom Line

            
            
EFSA health claim: 'contributes to weight loss in the context of an energy-restricted diet.' Glucomannan is the only dietary fiber with an EU-approved weight-loss health claim. Meta-analysis confirms statistically significant body weight reduction.

            
            
        

    











    
    

        
        

            

  
Key Statistics





            


    

        
9

        
Studies

    

    

        
509

        
Participants

    

    

        
            
            ↑
            
        
        
Positive

    

    

        A

        
Grade

    




        


        
        

        
        
        

            

  
Dosage & Usage





            
mg = milligrams · mcg = micrograms (1,000× smaller) · IU = International Units


            
            

                
Commonly Used Dosages

                

                    
                    

                        
general:

                        
1 g 3x/day (30-60 min before meals)

                    

                    
                    

                        
weightmanagement:

                        
3-4 g/day with ample water

                    

                    
                

                
                

                    Upper limit: 4 g/day; must be taken with 250+ mL water to prevent esophageal/GI obstruction
                

                
            

            

            

            
            

                Best taken: 30-60 minutes before meals with a full glass of water
            

            
        

        

        
        
        

            

  
Safety & Side Effects





            

                
                

                    
Reported Side Effects

                    
    
                        
                        
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                            ⚠
                            Bloating and gas
                        
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                            ⚠
                            Esophageal obstruction (if insufficient water)
                        
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                            ⚠
                            GI discomfort
                        
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Known Interactions

                    
    
                        
                        
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                            ●
                            May delay absorption of oral medications
                        
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                            ●
                            Diabetes medications (may lower blood sugar)
                        
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                        Tolerable upper intake: 4 g/day; must be taken with 250+ mL water to prevent esophageal/GI obstruction
                    

                

                
            

            

                Always consult your healthcare provider before starting any supplement.
            

        

        

        
        
        

            

  
Frequently Asked Questions





            




    
    

        
            Does Glucomannan help with Obesity?
            
        
        

            Based on 9 studies with 509 participants, there is strong evidence from multiple clinical trials that Glucomannan may support Obesity management. Our evidence grade is A (Strong Evidence).
        

    

    
    

        
            How much Glucomannan should I take for Obesity?
            
        
        

            Studies have used various dosages. A commonly studied range is 1 g 3x/day (30-60 min before meals). Always consult your healthcare provider before starting any supplement regimen.
        

    

    
    

        
            Are there side effects of Glucomannan?
            
        
        

            Reported side effects may include Bloating and gas, Esophageal obstruction (if insufficient water), GI discomfort. Most side effects are mild and dose-dependent. Consult your doctor if you experience any adverse reactions.
        

    

    
    

        
            How strong is the evidence for Glucomannan and Obesity?
            
        
        

            We rate the evidence as Grade A (Strong Evidence). This rating is based on 9 peer-reviewed studies with 509 total participants. The overall direction of effect is positive.
        

    

    




        

        

        
        
        

            

  
Related Evidence





            

                
                
                

                
                

                    
Glucomannan for other conditions

                    

                        
                        
                            Appetite Control
                            A

                        
                        
                    

                

                
            

        

        

    


    
    












    

        FDA Disclaimer:
        These statements have not been evaluated by the Food and Drug Administration. The products and information on this website are not intended to diagnose, treat, cure, or prevent any disease. The evidence grades presented are based on our analysis of published peer-reviewed research and do not constitute medical advice. Always consult your healthcare provider before starting any supplement regimen.