- FAO.org: Chapter 11. Calcium
- Covers chemistry and distribution, determinants of calcium balance, absorption, requirements, populations at risk, and nutritional factors.
- FAQs.org: Calcium
- Includes the importance of calcium, its interaction with Vitamin D, deficiency and toxicity, and requirements and supplementation.
- Merck Manual: Disorders of Calcium Concentration
- Describes how the body uses and regulates calcium, including overly high or low levels and their causes.
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