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As people age, the ability to absorb vitamin B12 from food often diminishes due to decreased stomach acid production
So, you measure a higher B12, but part of that B12 is inactive, so useless Oral B12 supplementation, even in the form of a multivitamin preparation, may result in serum B12 concentrations just within the normal range without abolishing symptoms
Journal of Pharmaceutical and Biomedical Analysis (2021) 4
Unlike oral supplements, B12 injections deliver the vitamin directly into your bloodstream for maximum absorption and immediate results
With injections, you will see benefits faster than with vitamins
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