can you buy vitamin b12 injections over the counter Injection: Energy Boost and Anemia Treatment — Mountainside Medical How Much Are B12 Shots?
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Cell Tissue Res

[1] [3] The standard UK treatment involves hydroxocobalamin 1mg intramuscular injections, with dosing regimens typically consisting of initial loading doses (e.g., every other day for two weeks) followed by maintenance doses every 2-3 months for conditions like pernicious anaemia

The problem is most people are not getting enough of it

In clinical practice, B12 injections are administered intramuscularly, usually into the deltoid or gluteal muscle
Test your level regularly and consult with a sports dietitian to make sure you are fueling your individual performance needs.
As your symptoms improve, you might only need them every few months or so