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  1. Vitamin D - NHS

  2. Vitamin D: what you need to know - Which?

  3. The 9 Best Vitamin D Supplements - Verywell Health

  4. Vitamin D - Mayo Clinic

  5. 8 Best Vitamin D Supplements for 2024 - Healthline

  6. The best vitamin D supplements to help boost your immunity

  7. Vitamin D: Benefits, Sources, Deficiencies - Healthline

  8. Vitamin D 101 — A Detailed Beginner's Guide - Healthline

  9. Vitamin D - Office of Dietary Supplements (ODS)

  10. Vitamin D deficiency in adults: Vitamin D supplements - NICE