b12 injection studies What are the benefits of injection? Best Vitamin B12 Injection Site:

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Some researchers recommended treating vitamin B12 deficiencies with either cyanocobalamin or a combination of methylcobalamin and adenosylcobalamin due to distinct properties of these latter two forms

All in all, B12 shots are both safe and efficacious

Clean handling helps reduce contamination risk

For patients with diabetes, regular monitoring of blood glucose levels and periodic measurement of hemoglobin A1c helps assess glycemic control and guide dose adjustments

I have read on these boards that symptoms often get worse before things get better and that was definitely the case with me, hang in there it's worth it in the end