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However, for some individuals with residual absorption capabilities, high-dose oral supplements can serve as an alternative
Injections are generally more effective
JAMA 327 , 138150 (2022)
For patients who have difficulty absorbing B12 through the digestive tractsuch as those with pernicious anemia, gastrointestinal disorders (like Crohns disease or celiac disease), a history of gastric bypass surgery, or those with severe B12 deficiencyour providers often recommend intramuscular B12 injections
Its dosage is taken as per the advice of the doctor as it can cause side effects to some people
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