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Risks of taking vitamin B12 injections include taking unnecessarily high amounts (which arent always absorbed properly anyway) and experiencing interactions with other medications.
These medications include proton pump inhibitors (which are sometimes prescribed for people with GERD), the gout medication colchicine, the diabetes drug metformin, and H2 blockers such as Pepcid
If any step breaks down (low stomach acid, lack of intrinsic factor, or gut inflammation), much of the B12 passes through unabsorbed
Some people choose to visit their doctor, who will administer a B12 shot during their office visit
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