b12 injections hydroxocobalamin Vitamin Injection 1mg/1ml ( 5 vials) Hydroxocobalamin - Wikipedia

Suitable for horses, dogs, and cats

It is inactive, which means it must undergo a conversion process in the body before it can be absorbed and used

Genetic variants in intrinsic factor, gastric acid production, and B vitamin metabolism help determine whether you'll benefit from standard oral B12, methylcobalamin, or intramuscular administration

This study below, published in 1967 carried out trials to determine how long cyanocobalamin and hydroxocobalamin B12 injections lasted before excretion in urine but you can see from their summary that it would be unreliable to assume that one size fits all

Many protocols combine them for synergistic effects

However, clinical trial results are not the only factor that matters in real-world decision-making