how much b12 injection per month Long Does It Take for Shots to Work Fast? Vitamin B12 Injection – Prescription

This timeline matches B12 pharmacokinetics: intramuscular methylcobalamin reaches peak serum concentration at 8-12 hours, but tissue saturation (particularly in the liver and nervous system) occurs over 48-72 hours as the vitamin is transported into cells and converted to active coenzyme forms (Andrs et al., 2018)

MICC (Methionine, Inositol, Choline, Cyanocobalamin) MICC is a compounded blend of four nutrients: methionine, inositol, choline and cyanocobalamin (a form of vitamin B12)

And I've got additional folate too

[26] A complication of severe chronic PA is subacute combined degeneration of spinal cord, which leads to distal sensory loss (posterior column), absent ankle reflex, increased knee reflex response, and extensor plantar reflex response

The right sequence is simple: test first, treat if indicated