will b12 injections cause weight gain for Non-Surgical Loss B12 shots for weight loss:

How Long Do Trigger Point Injections Last

While the magnitude of this effect varies among individuals, even modest increases in metabolic rate can support sustained fat loss over time

These are more considerations of medications affecting vitamin status (rather than the vitamin affecting the medication), but they illustrate the clinical judgment required when co-administering this injection with certain treatments

The B12-producing bacteria that used to populate our soils have been depleted through modern agricultural techniques, meaning that even grazing livestock is unlikely to get enough B12 for us to absorb efficiently by consuming animal-derived food