b12 injections and weight loss Vitamin Injections: What You Need To Know B12 Injections for Weight Loss

but the doc dismissed it and just gave me iron and told me to take supplements

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Common side effects associated with the B-12 shot include soreness at the injection site, diarrhea, swelling and itching

Monitoring-guided supplementation is the usual approach, typically beginning with oral supplementation if blood tests indicate suboptimal levels, and escalating to IM injection if oral treatment is insufficient or poorly tolerated