feeling worse after b12 injection Why do I feel a injection? do b12 injections have side

1 The exportin-1 inhibitor selinexor was evaluated in the phase 3 BOSTON study of selinexor, bortezomib, and dexamethasone therapy administered once weekly versus twice weekly doublet therapy with bortezomib and dexamethasone

doi:10.1017/s0007114509359127 Patel RV, Mistry BM, Shinde SK, Syed R, Singh V, Shin HS

For those who might not be getting enough B12 through their diet vegans, vegetarians, or people with absorption issues B12 injections deliver fast-acting and bioavailable nutrients directly into the bloodstream

All copper peptides share similar potential side effects: temporary redness, irritation with high concentrations, and possible allergic reaction in those with copper sensitivity

The mechanisms differ entirely