Evidence-based guide to vitamin D: cholecalciferol metabolism, calcium homeostasis, immune function, 25(OH)D blood testing, dosages, and toxicity risks.

September 2, 2026

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Calcium in the Body: Why It Matters, How to Recognize Deficiency and Excess, and How to Choose Supplements Safely

A practical guide to calcium: its roles in bone and neuromuscular function, links with vitamin D and parathyroid hormone, food, testing and supplement safety.

September 1, 2026

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Vitamin D: Bones, Testing, Supplements, and the Risks of Megadoses

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Calcium in the Body: Why It Matters, How to Recognize Deficiency and Excess, and How to Choose Supplements Safely