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More rarely, more serious reactions may occur, such as allergic reactions (urticaria, itching, shortness of breath, facial swelling), heart failure in people with pre-existing problems, or hypokalemia (low potassium levels) at the beginning of treatment due to increased hematopoiesis

Once you know your concentration (e.g., 5,000mcg/mL), you can determine the volume needed for your desired dose

It typically peaks in the first few days after each injection, then subsides

If you have anemia (a condition where your blood doesnt have enough healthy red blood cells), B-12 injections could help fix the issue, Stanford says