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  1. Vitamin D deficiency: Can it cause high blood pressure? - Mayo Clinic

    Darker skin has higher levels of a natural substance called melanin. The more melanin you have, the harder it is for your skin to make vitamin D from the sun.

  2. Vitamin D - Mayo Clinic

    Phosphate binders treat high blood levels of phosphate in people with longtime kidney disease. Anticonvulsants. The anticonvulsant medicines phenobarbital ( ...

  3. Mayo Clinic Q and A: How much vitamin D do I need?

    And certain health conditions that affect the gastrointestinal tract may decrease the absorption of vitamin D and predispose to low vitamin D blood levels. You ...

  4. Mayo Clinic Q and A: How much vitamin D do I need?

    And certain health conditions that affect the gastrointestinal tract may decrease the absorption of vitamin D and predispose to low vitamin D blood levels. You ...

  5. A Study of Blood Sugar and Vitamin D Levels in Local Minority Adolescents - Mayo Clinic

    Participating Mayo Clinic locations. Study statuses change often. Please contact the study team for the most up-to-date information regarding possible ...

  6. Vitamin D toxicity: What if you get too much? - Mayo Clinic

    Your healthcare professional may prescribe medicines such as corticosteroids or bisphosphonates to lower calcium levels in your blood. Follow any ...

  7. Vitamin D deficiency - Mayo Clinic

    This mainly happens if you take supplements. Studies haven't shown that high levels of vitamin D help health more. In fact, too much vitamin D has been linked ...

  8. Mayo Clinic Minute: Do you need more vitamin D in the winter?

    And if you're concerned that you're not getting enough vitamin D, ask your clinician for a simple blood test to check your vitamin D levels. The rainbow of ...

  9. Left Untreated over Time, Vitamin D Deficiency Can Lead to Serious Bone Disorders

    July 29, 2011. Dear Mayo Clinic: My niece, age 26, was recently found to have a very low vitamin D level on a blood test. She was advised to start taking a ...

  10. Vitamin D Toxicity Rare in People Who Take Supplements, Mayo Clinic Study Finds

    Thacher, M.D., a family medicine expert at Mayo Clinic. Hypercalcemia, or high blood calcium, can occur when there are very high levels of vitamin D in the ...