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Jun 2020;59(4):1585-1594

Animal Model of TBI Without Direct Head Impact 3.2.1

Diagnosis and treatment, if B12 deficiency is found, next moves on to a course of regular injections over a couple of weeks to assess your levels and your symptoms, and a follow-up blood test weeks later to see whether B12 has been retained by the body

Thats one of the signs you may need to follow up with a doctor
