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Conditions like pernicious anaemia (an autoimmune condition affecting a protein called intrinsic factor vital for B12 absorption), stomach issues (such as from reduced stomach acid or certain medications like proton pump inhibitors), intestinal disorders (like Crohns disease or coeliac disease), or even surgical removal of parts of the small intestine (e.g., gastric bypass surgery) can prevent proper absorption
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If you take oral contraceptives, the efficacy may be reduced
Compared with a control group, the infertile men in all groups had significantly higher levels of ROS and lower levels of total antioxidants
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