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  1. Calcium: What It Does and How Much You Need - Cleveland …

  2. Calcium and calcium supplements: Achieving the right balance

  3. CALCIUM - Uses, Side Effects, and More - WebMD

  4. Calcium: Health benefits, foods, and deficiency - Medical News …

  5. Calcium: What You Should Know - WebMD

  6. Calcium - Health Professional Fact Sheet - Office of Dietary ...

  7. Calcium: Benefits, Requirements, and Supplements - Healthline

  8. Calcium - Wikipedia

  9. Calcium | The Nutrition Source - Harvard T.H. Chan School of …

  10. Calcium | MedlinePlus