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My doctor said they don't need to test for vitamin D deficiency because most everyone is deficient. Should I just start taking supplements? - Quora
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Low vitamin D levels independently associated with severe COVID-19 cases, death
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Increased risk of cardiovascular disease may be starting in childhood: 25 OH vitamin D levels in Turkish Children | EJCM
Vitamin D: Health Benefits And Top Sources – Forbes Health
Is Your Vitamin D Level Too High? - GrassrootsHealth
Vitamin D3 25-Hydroxyvitamin D: Reference Range, Interpretation, Collection and Panels
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How to read my vitamin D results in my blood test results? Also, is vitamin D 3000-4000 units a day safe for older adults that are in heart medication and other meds -
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