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When your B12 levels are low, you may experience tiredness, weakness, trouble concentrating, or even mood changes
Call your health care provider immediately if you are experiencing any signs of an allergic reaction: skin rash, itching or hives, swelling of the face, lips, or tongue, blue tint to skin, chest tightness, pain, difficulty breathing, wheezing, dizziness, red, swollen painful area on the leg
If you are deficient in B12, a course of injections or high dose oral supplementation may be advised
Do note, pernicious anemia rarely visits alone
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