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  1. Vitamin D - Mayo Clinic

  2. Vitamin D3 Uses, Side Effects & Warnings - Drugs.com

  3. Vitamin D deficiency - Mayo Clinic

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

  5. Vitamin D3 Side Effects: Common, Severe, Long Term - Drugs.com

  6. Calcium Plus Vitamin D3 Uses, Side Effects & Warnings - Drugs.com

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

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

  9. Vitamin D vs D2 vs D3: What's the difference between them?

  10. Cholecalciferol Uses, Side Effects & Warnings - Drugs.com