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Folate (Vitamin B9) for Elevated Homocysteine (Hyperhomocysteinemia)

B

Consistently reduces homocysteine 20-30%. CSPPT: 21% stroke reduction in unfortified Chinese population. Research suggests less benefit in folic acid-fortified populations.

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The Bottom Line

            
            
Consistently reduces homocysteine 20-30%. CSPPT: 21% stroke reduction in unfortified Chinese population. Research suggests less benefit in folic acid-fortified populations.

            
            
        

    











    
    

        
        

            

  
Key Statistics





            


    

        
30

        
Studies

    

    

        
30000

        
Participants

    

    

        
            
            ↑
            
        
        
Positive

    

    

        B

        
Grade

    




        


        
        

        
        
        

            

  
Dosage & Usage





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


            
            

                
Commonly Used Dosages

                

                    
                    

                        
general:

                        
400 mcg DFE/day

                    

                    
                    

                        
homocysteinereduction:

                        
400-800 mcg/day folic acid (with B12 and B6)

                    

                    
                

                
                

                    Upper limit: 1,000 mcg/day folic acid from supplements
                

                
            

            

            

            
            

                Best taken: With or without food; consistent daily timing preferred
            

            
        

        

        
        
        

            

  
Safety & Side Effects





            

                
                

                    
Reported Side Effects

                    
    
                        
                        
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                            ⚠
                            Generally very well-tolerated
                        
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                            ⚠
                            May mask vitamin B12 deficiency at high doses
                        
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                            ⚠
                            Rare: mild gastrointestinal discomfort
                        
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Known Interactions

                    
    
                        
                        
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                            ●
                            Methotrexate (folate may reduce efficacy)
                        
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                            ●
                            Antiepileptic drugs (phenytoin, carbamazepine — mutual interference)
                        
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                            ●
                            Vitamin B12 (co-supplementation recommended for homocysteine reduction)
                        
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                        Tolerable upper intake: 1,000 mcg/day folic acid from supplements
                    

                

                
            

            

                Always consult your healthcare provider before starting any supplement.
            

        

        

        
        
        

            

  
Frequently Asked Questions





            




    
    

        
            Does Folate (Vitamin B9) help with Elevated Homocysteine (Hyperhomocysteinemia)?
            
        
        

            Based on 30 studies with 30,000 participants, there is moderate evidence from clinical studies that Folate (Vitamin B9) may support Elevated Homocysteine (Hyperhomocysteinemia) management. Our evidence grade is B (Good Evidence).
        

    

    
    

        
            How much Folate (Vitamin B9) should I take for Elevated Homocysteine (Hyperhomocysteinemia)?
            
        
        

            Studies have used various dosages. A commonly studied range is 400 mcg DFE/day. Always consult your healthcare provider before starting any supplement regimen.
        

    

    
    

        
            Are there side effects of Folate (Vitamin B9)?
            
        
        

            Reported side effects may include Generally very well-tolerated, May mask vitamin B12 deficiency at high doses, Rare: mild gastrointestinal discomfort. Most side effects are mild and dose-dependent. Consult your doctor if you experience any adverse reactions.
        

    

    
    

        
            How strong is the evidence for Folate (Vitamin B9) and Elevated Homocysteine (Hyperhomocysteinemia)?
            
        
        

            We rate the evidence as Grade B (Good Evidence). This rating is based on 30 peer-reviewed studies with 30,000 total participants. The overall direction of effect is positive.
        

    

    




        

        

        
        
        

            

  
Related Evidence





            

                

                
                

                    
Folate (Vitamin B9) for other conditions

                    

                        
                        
                            Coronary Artery Disease (CAD)
                            C

                        
                        
                    

                

                
            

        

        

    


    
    












    

        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.