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However, you are at increased risk of vitamin B12 deficiency if any of the following applies: You're age 50 or older
Possible side effects Vitamin B12 injections are generally well tolerated
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Medications and alcohol : Long-term use of certain medications like proton pump inhibitors (PPIs) or metformin, and chronic alcohol use, can interfere with B12 absorption
Shots Needing a quicker fix or wanting a boost in between your IV sessions
Some researchers report using vials up to 28-30 days after reconstitution without noticeable potency loss, but the general consensus leans toward using the vial within 3 weeks for optimal results
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