b12 injections not raising levels How Fast Does a Vitamin Shot Work? B12 Shots at Home: How,

Rather than supplying additional precursors, it limits NAD+ depletion by inhibiting NNMT, allowing exploration of upstream metabolic control

In the study by Neelakantan et al

Mineral water fortified with folic acid, vitamins B6, B12, D and calcium improves folate status and decreases plasma homocysteine concentration in men and women

As a globally recognized Vitamin B Complex with Vitamin B12 Injection Exporter , we supply premium-quality products to hospitals, pharmacies, and healthcare institutions across multiple continents

Can't answer as to whether you hit a nerve as I don't know, and didn't self-administer mine