how long does a b12 injection take to work Fast Vitamin Shot Work? The Truth About B12 Injections:
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Dietary requirements The daily requirement of vitamin B 12 has been set at 2.4 g, but higher amounts 4 to 7 g per day which are common in persons who eat meat or take a daily multivitamin, are associated with lower methylmalonic acid values

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B12 is typically absorbed through the stomach, so if you havestomach issues or have taken many common medications you may not be able to absorb it as effectively
