B12 shots deposit cobalamin into muscle tissue, where it releases gradually into the bloodstream over hours to days
PYX-201, an auristatin-carrying ADC targeting the extra-domain B splice variant of fibronectin (EDB + FN, an extracellular matrix protein abundantly expressed in the tumor microenvironment), is currently being evaluated in a phase I monotherapy trial (NCT06795412) and a phase I/II combination trial with pembrolizumab (NCT05720117) in patients with advanced solid tumors 242
GSH also detoxifies electrophilic xenobiotics compounds (chemical carcinogens, environmental pollutants, drugs, etc.) and their metabolites to GSH adduct (GS-X) in the direct catalysis of glutathione-S-transferase (GST, primary approach) [32]
Melittin has been used in vaccine production to boost protection against leishmaniasis
There are practical reasons too: B can be unstable if mixed with certain other vitamins in solution, and dosing schedules for B deficiency (pernicious anemia, for instance) may differ