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Quick refresher: what B12 actually does Vitamin B12 (cobalamin) is a water-soluble vitamin involved in red blood cell formation, nervous system maintenance, and the methylation reactions that support energy metabolism

[20] Pernicious anemia may be present without a person experiencing symptoms at first, over time, feeling tired and weak, lightheadedness, dizziness, headaches, rapid or irregular heartbeat, breathlessness, glossitis (a sore red tongue), poor ability to exercise, low blood pressure, cold hands and feet, pale or yellow skin, easy bruising and bleeding, low-grade fevers, tremor, cold sensitivity, chest pain, upset stomach, nausea, loss of appetite, heartburn, weight loss, diarrhea, constipation, severe joint pain, feeling abnormal sensations including tingling or numbness to the fingers and toes ( pins and needles ), and tinnitus, may occur

Obese individuals under medication to control gastroesophageal reflux also may report vitamin B12 deficiency

Correcting a deficiency requires an initial series of frequent doses to build up your levels, while a wellness plan focuses on regular maintenance shots to keep you feeling your best

Who should get a Vitamin B12 shot