where can vitamin b12 be injected Injections: Hot Shots? Full Guide · PA Relief Boost Your Energy with B12
Description
Neurological symptoms may take several weeks to months to improve, with some deficits potentially persisting if treatment is delayed

Its also thought that some other ingredients that are in the B12 injections could possibly cause the reaction, instead the the B12 itself but this will vary on different brands and formulations
Small Fiber Neuropathy (SFN) No Dedicated Code FY2026 ICD-10-CM does not contain a specific code for small fiber neuropathy

Neuropsychiatric disorders caused by cobalamin deficiency in the absence of anemia or macrocytosis
