does b12 have to be injected into muscle

https://antiagingsa.com/wp-content/uploads/sites/9/2017/11/vitamin-b12-injections-297x300.png Vitamin B12 Injections | B12 injections | Mountainside Medical C-BYB If it is diet, medication or vitamin related, then it should go away when you stop taking that diet or medicine Size:30mL

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