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WeightCited

Caffeine for Fat Oxidation Enhancement

A

Meta-analysis of 13 RCTs (n=606) found caffeine significantly increases resting metabolic rate by 3-11% and fat oxidation. A 100 mg/day increase in caffeine intake was associated with 0.11 kg less weight gain per 4-year period in two large prospective cohorts.

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The Bottom Line

            
            
Meta-analysis of 13 RCTs (n=606) found caffeine significantly increases resting metabolic rate by 3-11% and fat oxidation. A 100 mg/day increase in caffeine intake was associated with 0.11 kg less weight gain per 4-year period in two large prospective cohorts.

            
            
        

    











    
    

        
        

            

  
Key Statistics





            


    

        
13

        
Studies

    

    

        
606

        
Participants

    

    

        
            
            ↑
            
        
        
Positive

    

    

        A

        
Grade

    




        


        
        

        
        
        

            

  
Dosage & Usage





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


            
            

                
Commonly Used Dosages

                

                    
                    

                        
general:

                        
100-200 mg/day

                    

                    
                    

                        
thermogenic:

                        
200-400 mg/day

                    

                    
                    

                        
preexercise:

                        
3-6 mg/kg body weight

                    

                    
                

                
                

                    Upper limit: 400 mg/day (FDA general guideline for healthy adults)
                

                
            

            

            

            
            

                Best taken: Morning or pre-exercise; avoid within 6 hours of bedtime; tolerance develops over 1-2 weeks
            

            
        

        

        
        
        

            

  
Safety & Side Effects





            

                
                

                    
Reported Side Effects

                    
    
                        
                        
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                            Insomnia
                        
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                            Anxiety and jitteriness
                        
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                            Increased heart rate
                        
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                            Digestive upset
                        
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                            Tolerance development over 1-2 weeks
                        
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Known Interactions

                    
    
                        
                        
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                            ●
                            Adenosine receptor agonists
                        
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                            Lithium (reduced clearance)
                        
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                            Theophylline
                        
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                            MAOIs
                        
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                            Other stimulants (additive effects)
                        
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                        Tolerable upper intake: 400 mg/day (FDA general guideline for healthy adults)
                    

                

                
            

            

                Always consult your healthcare provider before starting any supplement.
            

        

        

        
        
        

            

  
Frequently Asked Questions





            




    
    

        
            Does Caffeine help with Fat Oxidation Enhancement?
            
        
        

            Based on 13 studies with 606 participants, there is strong evidence from multiple clinical trials that Caffeine may support Fat Oxidation Enhancement management. Our evidence grade is A (Strong Evidence).
        

    

    
    

        
            How much Caffeine should I take for Fat Oxidation Enhancement?
            
        
        

            Studies have used various dosages. A commonly studied range is 100-200 mg/day. Always consult your healthcare provider before starting any supplement regimen.
        

    

    
    

        
            Are there side effects of Caffeine?
            
        
        

            Reported side effects may include Insomnia, Anxiety and jitteriness, Increased heart rate, Digestive upset. Most side effects are mild and dose-dependent. Consult your doctor if you experience any adverse reactions.
        

    

    
    

        
            How strong is the evidence for Caffeine and Fat Oxidation Enhancement?
            
        
        

            We rate the evidence as Grade A (Strong Evidence). This rating is based on 13 peer-reviewed studies with 606 total participants. The overall direction of effect is positive.
        

    

    




        

        

        
        
        

            

  
Related Evidence





            

                
                

                    
Other ingredients for Fat Oxidation Enhancement

                    

                        
                        
                            L-Carnitine
                            B

                        
                        
                        
                            Synephrine
                            B

                        
                        
                        
                            Capsaicin
                            B

                        
                        
                    

                

                

                
                
                
            

        

        

    


    
    












    

        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.