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The most common options outside hospitals are methylcobalamin and cyanocobalamin

It is composed of three amino acids (glycine, histidine, and lysine) bound to copper, which allows it to interact with cells to produce collagen, and promote tissue repair

[1] It is used as a diluent to dissolve or dilute medications for intravenous (IV), intramuscular (IM), or subcutaneous (SQ) injection according to the instructions of the specific drug being prepared

Methylcobalamin increases Erk1/2 and Akt activities through the methylation cycle and promotes nerve regeneration in a rat sciatic nerve injury model

They might not absorb it as well

This is also why you might notice that diets and exercises that worked for you in the past do not work as well or at all later in life