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So, why B12 shots
Drug-induced deficiencies (e.g., isoniazid, oral contraceptives)
Vitamin B12 deficiency may cause pins and needles in the hands or feet
On the physical side, you might notice constant tiredness that doesn't improve with rest, heavy legs during workouts, shortness of breath on efforts that shouldn't wind you, pale skin, and a need for frequent napping
Bibliography Best, C
However, the only way to confirm is through a blood test
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