injectable b12 over the counter Methylcobalamin Injection in Beverly Hills, Arcadia and Los Angeles County Nature Made Sublingual Vitamin B Cyanocobalamin Vitamin B12 5000 mcg/mL,

Several types of nanoparticles have been investigated for cancer vaccination, including liposomes, inorganic nanocarriers, dendrimers, polymeric systems, nucleic acid nanotechnology, micelles, carbon nanotubes, mesoporous silica nanoparticles, and gold nanoparticles

I tried the B12 Cyanocobalamin and did not like them as they burn a lot during injection

Tirzepatide population pharmacokinetics and exposure Schneck 19-study pooled popPK (CL/F 0.061 L/h, half-life 5.4 d, accumulation 1.7x, body-weight covariate +22% at 70 kg / -33% at 120 kg)

If you ask about Methylcobalamin it is likely your doc will not recommend it because it is not the treatment protocol he was taught or it is not a treatment specified by his or her local health authority