Does Slow Fe Cause Stomach Upset? Understanding the 'Gentler' Iron
                                
                                
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                                    6 min read                                
                            
                                According to Drugs.com, some people taking Slow Fe may still experience side effects like nausea and stomach pain. While marketed as a 'gentle' iron supplement, this controlled-release formula may cause stomach upset, necessitating adjustments to your routine for better tolerance.