pros of b12 injection Should You Take Vitamin Shots? B12 Shots for Weight Loss:

The ability of hydroxocobalamin to rapidly scavenge and detoxify cyanide by chelation has resulted in several acute animal and human studies using systemic hydroxocobalamin doses at suprapharmacological doses as high as 140 mg/kg to support its use as an intravenous (IV) treatment for cyanide exposure

NNMT is a known drain on NAD+, and 5-Amino-1MQ appears to inhibit this process by helping maintain more usable NAD+ within cells

"Cognitive impairment and vitamin B12: a review"

Your GP may arrange periodic blood tests to ensure B12 levels remain adequate, though clinical response is generally more important than specific blood values once treatment is established