4) Blood Disorders Certain conditions affecting blood and bone marrow including some leukaemias and myeloproliferative disorders such as polycythaemia vera can cause elevated B12 due to increased production of B12binding proteins by white blood cells
They'll look at your medical background, any other meds you're taking, and figure out if these shots are actually a good idea for you
This means that they cannot carry oxygenated blood around the body properly, leading to nerve damage or neuropathy
Possible adverse effects may include: Injection site reactions : Redness, swelling, irritation, or discomfort Gastrointestinal symptoms : Nausea, vomiting, stomach cramps, or diarrhea Headaches or dizziness Allergic reactions : Rash, itching, shortness of breath, or facial swelling (rare) Increased heart rate or anxiety (typically temporary from B-vitamins) Fatigue or weakness if used improperly Elevated liver enzymes when taken in excess particularly with methionine or choline Insomnia if taken late in the day due to increased energy levels Who should avoid or use caution