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  1. Tips for Vitamin Dosages for Older Adults - WebMD

  2. Vitamin D - Mayo Clinic

  3. Vitamin D: What to Know & How Much to Take - Better Health …

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

  5. Vitamin D in the Elderly - The Geriatric Dietitian

  6. What Vitamin D Dosage Is Best? - Healthline

  7. Vitamin D for the Prevention of Disease | Endocrine Society

  8. Vitamin D recommendations | International Osteoporosis …

  9. How Much Vitamin D Should You Take For Optimal Health?