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Formulations are not standardised concentrations vary by compounding pharmacy, which is one reason cross-clinic comparisons and published timelines are unreliable
But once an older person has a good level of vitamin B12 in the body, its not clear that additional vitamin B12 will reduce the risk of problems like cancer or dementia
Though health experts generally advise that vegans check that the foods they eat contain B12
The practical tradeoffs between the two methods come down to time, customization, and cost
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