b12 injection treatment Shots at Home: How, Where & How Often to Inject Yourself Everything you need to know

Office of Dietary Supplements, US National Institutes of Health

Common lab protocols involve reconstitution in bacteriostatic water and subcutaneous injection in animal models using calibrated syringes to achieve precise dosing

I would respectfully ask if the B12 test could be repeated, I have learned here that B12 supplementing can alter folate levels so I wonder if your folate level being considerably above the high end of the range has masked your B12 deficiency and affected your B12 levels

That is, if you want the B12 to do its job and stabilize the behavior and brain function of your child, your child must first comply with the shots