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Iron for Post-Bariatric Nutritional Support

B

Iron deficiency occurs in 33-55% of post-bariatric patients. ASMBS guidelines recommend 45-60 mg elemental iron/day after gastric bypass. Ferrous bisglycinate is the preferred form for tolerability. Monitoring every 3-6 months is mandatory.

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            B

        

        

            
The Bottom Line

            
            
Iron deficiency occurs in 33-55% of post-bariatric patients. ASMBS guidelines recommend 45-60 mg elemental iron/day after gastric bypass. Ferrous bisglycinate is the preferred form for tolerability. Monitoring every 3-6 months is mandatory.

            
            
        

    











    
    

        
        

            

  
Key Statistics





            


    

        
10

        
Studies

    

    

        
1000

        
Participants

    

    

        
            
            ↑
            
        
        
Positive

    

    

        B

        
Grade

    




        


        
        

        
        
        

            

  
Dosage & Usage





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


            
            

                
Commonly Used Dosages

                

                    
                    

                        
general:

                        
8-18 mg/day (RDA)

                    

                    
                    

                        
menstruatingwomen:

                        
18 mg/day

                    

                    
                    

                        
deficiencycorrection:

                        
100-200 mg elemental iron/day under medical guidance

                    

                    
                

                
                

                    Upper limit: 45 mg/day (elemental iron); excess iron increases oxidative stress
                

                
            

            

            

            
            

                Best taken: On empty stomach with vitamin C for absorption; avoid with calcium, coffee, tea
            

            
        

        

        
        
        

            

  
Safety & Side Effects





            

                
                

                    
Reported Side Effects

                    
    
                        
                        
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                            ⚠
                            Constipation
                        
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  • 
                            ⚠
                            Nausea
                        
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  • 
                            ⚠
                            Stomach pain
                        
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  • 
                            ⚠
                            Black stools
                        
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  • 
                            ⚠
                            Oxidative stress (excess iron)
                        
    • 
                        
                    

                

                

                
                

                    
Known Interactions

                    
    
                        
                        
  • 
                            ●
                            Levothyroxine (reduced absorption — take 4 hours apart)
                        
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                            ●
                            Tetracycline antibiotics (reduced absorption)
                        
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                            ●
                            Calcium supplements (reduced absorption)
                        
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  • 
                            ●
                            Proton pump inhibitors (reduced absorption)
                        
    • 
                        
                    

                

                

                
                

                    

                        Tolerable upper intake: 45 mg/day (elemental iron); excess iron increases oxidative stress
                    

                

                
            

            

                Always consult your healthcare provider before starting any supplement.
            

        

        

        
        
        

            

  
Frequently Asked Questions





            




    
    

        
            Does Iron help with Post-Bariatric Nutritional Support?
            
        
        

            Based on 10 studies with 1,000 participants, there is moderate evidence from clinical studies that Iron may support Post-Bariatric Nutritional Support management. Our evidence grade is B (Good Evidence).
        

    

    
    

        
            How much Iron should I take for Post-Bariatric Nutritional Support?
            
        
        

            Studies have used various dosages. A commonly studied range is 8-18 mg/day (RDA). Always consult your healthcare provider before starting any supplement regimen.
        

    

    
    

        
            Are there side effects of Iron?
            
        
        

            Reported side effects may include Constipation, Nausea, Stomach pain, Black stools. Most side effects are mild and dose-dependent. Consult your doctor if you experience any adverse reactions.
        

    

    
    

        
            How strong is the evidence for Iron and Post-Bariatric Nutritional Support?
            
        
        

            We rate the evidence as Grade B (Good Evidence). This rating is based on 10 peer-reviewed studies with 1,000 total participants. The overall direction of effect is positive.
        

    

    




        

        

        
        
        

            

  
Related Evidence





            

                
                

                    
Other ingredients for Post-Bariatric Nutritional Support

                    

                        
                        
                            Vitamin B12
                            B

                        
                        
                        
                            Whey Protein
                            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.