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HeartCited

Calcium for High Blood Pressure (Hypertension)

C

Small meta-analytic BP reduction (-1.4 mmHg systolic). Overwhelmed by cardiovascular safety concerns from supplement studies. Dietary calcium preferred.

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The Bottom Line

            
            
Small meta-analytic BP reduction (-1.4 mmHg systolic). Overwhelmed by cardiovascular safety concerns from supplement studies. Dietary calcium preferred.

            
            
        

    











    
    

        
        

            

  
Key Statistics





            


    

        
13

        
Studies

    

    

        
1500

        
Participants

    

    

        
            
            ↔
            
        
        
Mixed

    

    

        C

        
Grade

    




        


        
        

        
        
        

            

  
Dosage & Usage





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


            
            

                
Commonly Used Dosages

                

                    
                    

                        
note:

                        
Prefer dietary sources; limit supplements to 500 mg/dose

                    

                    
                    

                        
general:

                        
1,000-1,200 mg/day from diet plus supplements

                    

                    
                

                
                

                    Upper limit: 2,000-2,500 mg/day (total from diet and supplements)
                

                
            

            

            

            
            

                Best taken: Divide doses (500 mg max per dose); carbonate with meals; citrate any time
            

            
        

        

        
        
        

            

  
Safety & Side Effects





            

                
                

                    
Reported Side Effects

                    
    
                        
                        
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                            ⚠
                            Constipation (especially carbonate form)
                        
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                            ⚠
                            Potential increased MI risk with high-dose supplements (controversial)
                        
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                            Kidney stones at excessive doses
                        
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                            ⚠
                            Gas, bloating
                        
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Known Interactions

                    
    
                        
                        
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                            ●
                            Thyroid medications (separate by 4 hours)
                        
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                            Bisphosphonates (separate by 30-60 minutes)
                        
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                            Iron supplements (reduced absorption — separate by 2 hours)
                        
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                            Certain antibiotics (reduced absorption)
                        
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                            Vitamin K2 (may help direct supplemental calcium to bones, not arteries)
                        
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                        Tolerable upper intake: 2,000-2,500 mg/day (total from diet and supplements)
                    

                

                
            

            

                Always consult your healthcare provider before starting any supplement.
            

        

        

        
        
        

            

  
Frequently Asked Questions





            




    
    

        
            Does Calcium help with High Blood Pressure (Hypertension)?
            
        
        

            Based on 13 studies with 1,500 participants, there is limited but promising evidence that Calcium may support High Blood Pressure (Hypertension) management. Our evidence grade is C (Some Evidence).
        

    

    
    

        
            How much Calcium should I take for High Blood Pressure (Hypertension)?
            
        
        

            Studies have used various dosages. A commonly studied range is Prefer dietary sources; limit supplements to 500 mg/dose. Always consult your healthcare provider before starting any supplement regimen.
        

    

    
    

        
            Are there side effects of Calcium?
            
        
        

            Reported side effects may include Constipation (especially carbonate form), Potential increased MI risk with high-dose supplements (controversial), Kidney stones at excessive doses, Gas, bloating. Most side effects are mild and dose-dependent. Consult your doctor if you experience any adverse reactions.
        

    

    
    

        
            How strong is the evidence for Calcium and High Blood Pressure (Hypertension)?
            
        
        

            We rate the evidence as Grade C (Some Evidence). This rating is based on 13 peer-reviewed studies with 1,500 total participants. The overall direction of effect is mixed.
        

    

    




        

        

        
        
        

            

  
Related Evidence





            

                
                
                

                
            

        

        

    


    
    












    

        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.