While brands like Bedoyecta (a common brand often containing a complex of B vitamins, not just B12) are popular in some areas, the most common forms of B12 specifically for injection are Cyanocobalamin and Methylcobalamin
pregnant women often receive IV thiamine if needed (e.g., for hyperemesis) without issue
Some people use vitamin C injections for weight loss
No evidence for complete damage prevention or guaranteed full recovery
A second alternative might be that cereulide synthesis follows the classical collinear principle of NRPS product assembly including partial hydrolysis of the preformed tetradepsipetides, mediated by condensation domain reversibility
It promotes tissue repair, reduces inflammation, supports gut health, and may accelerate healing in muscles, tendons, and nerves