truth about b12 injections Are Vitamin Shots Right for You? Vitamin B12 Injection Side Effects

If you drink more alcohol than average your B12 levels will be lower than normal

Transitioning to Maintenance Therapy Once the deficiency is managed, patients move to maintenance therapy

I actually have read that paper - good one

Treatment Group After supplementation, there was a large and very significant increase in the level of CoQ10, and the levels of ATP, NADH, and NADPH all increased very significantly to normal levels

doi: 10.1038/sj.ijo.0801474

You might be thinking you want the shortest needle, but your doctor may have chosen a specific length based on how you were trained and your anatomy and/or pathology