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Without enough B12, you might experience persistent fatigue, muscle weakness, numbness or tingling, and even issues with memory or concentration
Its recommended to seek medical advice if experiencing the following or if these issues persist or worsen: Mild diarrhea Redness and pain at the injection site Swelling sensation in the body Temporary itching of the skin There may also be a risk of: Anaphylaxis (body goes into shock) Congestive heart failure Peripheral vascular thrombosis (involves blood clots) Polycythemia vera (a type of blood cancer) Pulmonary edema (too much fluid in the lungs) If you begin experiencing difficulty breathing, swelling, and hives, patients must seek emergency medical help
Thus, dietary supplement B 12 supplementation at 500 to 1000 g per day allows pernicious anemia and certain other defects in B 12 absorption to be treated with daily oral megadoses of B 12 without any correction of the underlying absorption defects
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