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Vitamin B12 Injection is an injectable cyanocobalamin product used to treat or prevent low vitamin B12 levels when replacement by mouth may not be enough

ABC transporters and drug efflux at the blood-brain barrier

The Journal of nutrition

Methylcobalamin, a form of B12, is particularly essential for synthesizing neuronal lipids, regenerating axonal nerves, and exerting neuroprotective effects, potentially improving conditions such as Alzheimer's disease, Parkinsonism, and dementia, while also serving as an approved treatment for peripheral neuropathy

Disclaimer: Compounded preparations are customized for individual patients and have not been evaluated or approved by the FDA for safety or efficacy