b12 injection medication assistance Hydroxocobalamin Injection: Vitamin for Energy & Anemia — Mountainside Medical Vitamin B-12 Injectable for Horses,
Description
You dont have to navigate symptoms or guess the right dosage on your own

After initial repletion, a maintenance dose is given, often 1,000 mcg intramuscularly every month or every 2 to 3 months, to prevent recurrence of deficiency

Someone in a coma may require thiamin injections

So, the B12 in the serum is OK, but in the brain, it is low
