Other side effects that can occur include: Excessive sweat production Rapid weight gain Pain when breathing Shortness of breath when lying down Anxiety Increased or irregular heart rate Numbness, tingling or muscular weakness Increased thirst Urinary frequency B12 injections can also cause allergy symptoms immediately after administration, like difficulty breathing, a swollen throat, mouth, or swelling of the mouth, tongue or face
It is not approved by the FDA for the treatment, prevention, or diagnosis of any disease
Vitamin B12 Vitamin B12 supports red blood cell formation, neurologic function, and energy metabolism
They include pain or redness at the injection site, slight swelling or tenderness, mild diarrhea, and sometimes itching or a generalized feeling of body swelling
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