however, compounded drugs themselves are not FDA-approved
Animal studies show substantial evidence across stroke models (full functional recovery in spatial memory, motor coordination, balance), Parkinsons models (protection of dopaminergic neurons, near-complete prevention of mortality), multiple sclerosis models (significantly less brain damage), and traumatic brain injury (reduced hemorrhage and edema)
B12 deficiency on its own leads to memory loss, cognitive decline, depression, constipation, diarrhea, nerve damage / numbness, sore tongue, insomnia, fatigue, abdominal discomfort, easy bruising / anemia, and and memory problems
The exact dose depends on your specific needs and what your doctor says