why do vitamin b12 injections hurt shots: Uses, benefits, and side effects Best Vitamin B12 Injection Sites
Description
(BNF B12 Deficiency: Hydroxocobalamin Treatment Regimes) pernicious-anaemia-society

To gauge improvement, track specific issues you had before, for instance, frequency of mouth sores (which can occur with B deficiencies), or numbness in feet, or level of fatigue on a 10-point scale
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CAN I TAKE A B12 SUPPLEMENT INSTEAD OF AN INJECTION
You can return to normal activities immediately

The decision to take supplements should be made individually after consultation with a doctor and conducting the necessary tests
