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Proton pump inhibitors and similar medications that lower stomach acid might decrease the absorption of vitamin B12 from food, but this is less of a concern when receiving B12 injections because they bypass the digestive system entirely
Statement on Compounding of Investigational Drugs
Low levels have been linked to several issues, including a decline in brain function and a possible link to depression
For this reason, it is not uncommon to feel tired and sluggish when vitamin B12 stores are low
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