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Vitamin B12 and Hair Loss at a Glance When to Test and What to Do Consider a B12 test if you have hair loss plus fatigue, pins‑and‑needles, low mood, tongue soreness, or a vegan/vegetarian diet, gut issues, or long‑term acid‑suppressing or metformin use

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The primary causes of vitamin B12 deficiency include insufficient dietary intake, malabsorption conditions, and certain medications