vitamin b12 injection vials B12, Cyanocobalamin, Injection, 1000mcg/mL, 1mL Vial, 25 B12 vitamin injection vials and
Description
Maximum Strength & Maximum Absorption: Each serving contains a maximum strength dose of 1000 mcg of B12
It seems you may need high B12 supplementation and to stop any folate supplements for a while

How Much B12 is Too Much

Data collection was conducted in - mode following the BraggBrentano method, within the 2 range of 4.860, using a step size of 0.011 and a time per step of 424 s