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Simpson CR, Kelly HM, Murphy CM
Unlike oral supplements, this method bypasses digestion, ensuring a higher concentration reaches the respiratory system where firefighters need it most
This is especially common when you first start supplementing and even more so during the loading phasemore on that in a minute
There is little to no evidence to suggest that regular use of B12 supplements or injections has any health benefit, if you do not have a lab-confirmed B12 deficiency
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