However, any pain usually passes quickly and patients can usually resume their normal activities immediately after the injection

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Wait at least two hours after eating before administering
They are also contraindicated or people with vision problems, Lebers disease, kidney failure, liver failure, folic acid deficiency or any type of systemic infection
And you dont have to visit a health care provider anymore, you can buy B12 injections online through companies like Hone
You have gastrointestinal issues and cant absorb vitamins well