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  1. Vitamin D deficiency - Mayo Clinic

  2. Vitamin D2 Uses, Side Effects & Warnings - Drugs.com

  3. Vitamin D - Mayo Clinic

  4. Vitamin D: Deficiency, Symptoms, Supplements & Foods

  5. Vitamin D2 Side Effects: Common, Severe, Long Term - Drugs.com

  6. Vitamin D and MS: Is there any connection? - Mayo Clinic

  7. Vitamin D deficiency: Can it cause high blood pressure?

  8. How can I raise my vitamin D levels quickly? - Drugs.com

  9. Vitamin deficiency anemia - Symptoms & causes - Mayo Clinic

  10. Vitamin D for babies: Are supplements needed? - Mayo Clinic