how long does vitamin b12 injection stay in the body a Shot Last? Effects, Duration & Frequency – DripGym Vitamin B12 Injections: Hot Shots?
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For instance, aerobic glycolysis, carnitine and lipid synthesis, tryptophan metabolism are upregulated, whereas the urea cycle and tricarboxylic acid (TCA) cycle are downregulated [66]

This is because older people tend to produce less stomach acid that is needed to convert the vitamin properly

The generic equivalent of Vitamin B12 Injection is Cyanocobalamin

Prevalence of iron, folate, and vitamin B12 deficiency anemia after laparoscopic Roux-en-Y gastric bypass

J1453, J1456, and J1434 are explicitly NOT therapeutically equivalent and must never be used interchangeably on a claim
