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It's usually temporary

If left untreated, a B12 deficiency can cause: Fatigue and weakness Pale skin Numbness or tingling in hands and feet (due to nerve damage) Difficulty walking or maintaining balance Cognitive issues like memory loss or confusion Mood disturbances such as depression or irritability Glossitis (inflammation of the tongue) Anemia Since the body doesnt produce Vitamin B12 naturally, its crucial to get enough from food sources or supplements

Morning dosing works if breakfast is your primary meal or if evening injections cause sleep disruption

And I take a methylcobalamin supplement and a B complex liquid supplement during the day and that helps stave off getting too tired