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[11] Long-term metformin therapy reduces calcium-dependent intrinsic-factor binding, lowering B12 absorption and potentially necessitating higher or more frequent parenteral doses

B12 supplementation will only help your hair if deficiency is genuinely contributing to the problem

Vitamin B12 injections are a prescription treatment used under the supervision of a licensed provider

Your Nurse Practitioner will review your health history to confirm suitability

Can pernicious anemia be treated with vitamin B 12 pills instead of injections

At $25-60 per injection weekly ($100-240 monthly), MIC B12 is a meaningful expense