can b12 injections cause low potassium What Are the Benefits of Vitamin Injections? Vitamin B12 Injections for Pernicious
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Combine low intake with impaired absorption, and deficiency becomes highly probable without supplementation

Vitamin B12 or folate deficiency anaemia - Causes

Przyborowski K, Wojewoda M, Sitek B, Zakrzewska A, Kij A, Wandzel K, Zoladz JA, Chlopicki S (2015) Effects of 1-methylnicotinamide (MNA) on exercise capacity and endothelial response in diabetic mice

Depending on your results, you may wish to undergo additional injections periodically or in series to achieve desirable results.