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Generally, when treating a B-12 deficiency, youll get a 1,000-microgram shot every day or two for the first week (2)
Some people do not absorb B12 efficiently due to age, gastrointestinal issues, or insufficient intrinsic factor, a protein required for B12 absorption
Reusing them introduces contamination risk into both the vial and the injection
Many clinics and wellness centers offer B12 injections
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