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  1. B Vitamins: Types, Benefits and Side Effects - Cleveland Clinic …

  2. Vitamin D - Mayo Clinic

  3. Vitamin D Deficiency: Causes, Symptoms & Treatment - Cleveland Clinic

  4. VITAMIN D - Uses, Side Effects, and More - WebMD

  5. Vitamin D: Benefits, deficiency, sources, and dosage - Medical News Today

  6. Comparative Study of Antioxidant Potential of Selected Dietary Vitamins

  7. Vitamin D Benefits (Plus Signs of Low Levels) - Verywell Health

  8. Vitamin B Deficiency: Your Complete Guide – Forbes Health

  9. Vitamin B Complex: Benefits, Side Effects, and More - Health

  10. Vitamin D - NHS