are there side effects from b12 injections How Fast Does Injection Work Do B12 shots give you energy? Why Do I Feel Worse

Many people report feeling more alert, less fatigued, and in a better mood within a few hours to days, as the body rapidly absorbs the Vitamin B12

So, 1000 mcg of B12 is the same as 1 mg

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Both types of injections have few associated side effects and constitute very effective treatment

You can try putting a cold compress on it for a few hours and see if it helps