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If you mean the common claim that “painful legs and bones means you’re lacking one particular vitamin,” that’s too simplistic.
The nutrient most directly associated with bone pain and muscle weakness when deficient is vitamin D. Severe vitamin D deficiency can impair bone mineralization and cause osteomalacia, which may produce diffuse bone or muscle pain.
Other deficiencies can cause different symptoms:
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Vitamin B12: numbness, tingling, burning sensations, or weakness in the legs.
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Vitamin C: muscle/joint pain and, in severe deficiency, bleeding gums and easy bruising.
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Calcium: muscle cramps, spasms, and—when significantly low—neurological symptoms.
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Iron: fatigue and weakness rather than typical bone pain.
So vitamin D is worth considering, but leg or bone pain can also result from arthritis, muscle problems, nerve disorders, medications, or other conditions. A blood test can determine whether vitamin D deficiency is actually present rather than guessing from symptoms alone.
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