is it safe to injection b12 in a persons back Shots at Home: How, Where & How Often Inject Yourself Best Vitamin B12 Injection Sites:
Description
Using combination therapies to target critical downstream signaling pathways is considered a rational approach

Depending on the products intended use, it may be available in oral or injectable forms
H., Qiu L

It is not recommended to take vitamin B12 if you are not diagnosed with vitamin B12 deficiency

Funding This work was supported by INOVA FIOCRUZ (VPPCB-005-FIO-20-2-115), Coordenao de Aperfeioamento de Pessoal de Nvel SuperiorCAPES (88881.504749/2020-01

As a result, vitamin B12 deficiency can show clinical effects such as progressive demyelination, peripheral neuropathy and haematological abnormalities (such as macrocytic anaemia and neutrophil hypersegmentation)