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Foods with B12 are always the first choice, but if you have trouble eating B12-rich foods, or have problems absorbing B12, another potential vitamin B12 source is a multivitamin
According to clinical observations reported by Integrative Medicine of Los Angeles, an intramuscular B12 injection is absorbed more slowly over a longer time frame compared to an IV infusion, which delivers the nutrient immediately into the vasculature
Very concentrated solutions (40 mg/mL or higher) can be slightly thicker, which means they flow through the needle more slowly
Delivered as intramuscular injections, these treatments provide a direct method of nutrient delivery that does not rely on digestion
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