If you’re referring to the viral headline “Tingling, extreme fatigue or blurred vision? Your body may be urgently demanding this essential vitamin,” the vitamin being suggested is usually vitamin B12.
There is some legitimate science behind the claim—but the symptoms do not automatically mean you have a B12 deficiency.
Vitamin B12 deficiency can cause
Tingling or numbness, particularly in the hands and feet
Extreme tiredness or weakness
Balance or walking problems
Memory or concentration difficulties
Vision problems related to nerve dysfunction
Pale skin, a sore tongue, or other symptoms of anemia
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NHLBI, NIH
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Importantly, neurological symptoms can occur even without anemia, and prolonged B12 deficiency can sometimes cause lasting nerve damage.
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Office of Dietary Supplements
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Who is more likely to become deficient?
Risk is higher with a diet very low in animal-derived foods, problems absorbing B12, pernicious anemia, certain gastrointestinal surgeries, and prolonged use of metformin or some acid-reducing medicines.
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NHLBI, NIH
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Don’t self-diagnose from symptoms
Tingling, fatigue, and blurred vision have many possible causes. A clinician can check B12 with a blood test and, when necessary, additional tests such as methylmalonic acid.
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NCBI
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Especially important: sudden or severe blurred vision, sudden weakness/numbness, or sudden difficulty speaking isn’t something to treat with a vitamin—it requires urgent medical assessment.
Bottom line: B12 deficiency is a real and treatable cause of these symptoms, but these symptoms alone don’t prove you need B12 supplements.
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