troy b12 injectable Vitamin Cyanocobalamin For Dogs Troy Vitamin Injection 100 ML Troy Laboratories Available in a 100 mL vial ready for injection. Vitamin B12 | Scone Equine

The benefit comes from replacing whats missing, not from extra B12 on top of normal levels

Doxorubicin inactivates myocardial cytochrome c oxidase in rats: cardioprotection by mito-Q

This is where vitamin B12 can make a significant difference

Many commercial preparations contain additional ingredients such as: Sorbitol or mannitol sugar alcohols used as sweeteners in some tablets that can cause osmotic diarrhoea when consumed in larger quantities, though the amounts in typical supplements are usually too small to cause symptoms alone [13] [14] Binding agents and fillers including lactose, which may cause symptoms in people with lactose intolerance, though tablet quantities are typically small Other additives various excipients that some individuals may be sensitive to The dose and frequency of supplementation may also influence tolerability

Or a forum member who knows the science I uses single use ampoules

Daratumumab plus atezolizumab in previously treated advanced or metastatic NSCLC: brief report on a randomized, open-label, phase 1b/2 study (LUC2001 JNJ-54767414)