feeling worse after b12 injection Why do I feel a injection? Common & Rare Side Effects

They are typically taken daily for a two-week period from the over-the-counter packets

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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

The mechanisms differ entirely

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