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

  2. Calcium and calcium supplements: Achieving the right balance

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

  4. Calcium: What You Should Know - WebMD

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

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

  7. Benefits and sources of calcium - Medical News Today