UK clinical practice, guided by the Specialist Pharmacy Service, generally discourages routine multi-dose vial use, and any diluent should be sourced from a reputable pharmaceutical-grade supplier
References: [1] KAI FU
Anyone can take it except people who are on antipsychotic and/or chemotherapy medications
Regular B12 supplementation can help prevent or treat deficiency symptoms such as fatigue, weakness, tingling or numbness in the extremities, memory issues, and anemia
Ethanol metabolism, CYP2E1 induction, compromised antioxidant defenses, mitochondrial injury, activation of Kupffer and stellate cells, hypoxia, and iron overload can all contribute to the alcohol-induced oxidative environment