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  1. Vitamins and Minerals: How Much Should You Take? - WebMD

  2. Listing of vitamins - Harvard Health

  3. Daily intake of vitamins and minerals: What to know - Medical …

  4. Nutrient Recommendations and Databases - Office of Dietary …

  5. Vitamins and Minerals – The Nutrition Source

  6. Should You Take Vitamins Daily? - Cleveland Clinic Health Essentials

  7. Recommended Daily Intakes and Upper Limits for Vitamins and …

  8. Recommended Daily Intakes for Vitamins - MSD Manuals

  9. Vitamin and Mineral Supplement Fact Sheets - Office of Dietary ...