b12 injections wiki Vitamin | B12 injections Aalto Helsinki

Apparently the underlying thought is that it is necessary to keep the value between the (upper and lower) reference values

Impaired Absorption, Distribution, Metabolism, and Excretion of Nutrients and Other Substances Impaired digestion can lead to impaired ADME (absorption, distribution, metabolism, and excretion of nutrients), and acid reflux, as the digestive tract no longer becomes able to optimally carry out its functions

It can correct deficiency-related fatigue, but it is not a stimulant

doi:10.1186/s13104-022-06224-8 Strmer P, Strathmann EA, Liedtke TP, et al

It is usually present in animal products, especially dairy products, poultry, eggs, and fish

Stay safe and prevent the spread of this contagious virus with effective vaccination