Retrieving "Vitamin D" from the archives

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1. Calcium

   Linked via "Vitamin D"

   In vertebrates, calcium ions ($\text{Ca}^{2+}$) are vital components of the skeletal structure, forming the crystalline hydroxyapatite ($\text{Ca}{10}(\text{PO}4)6(\text{OH})2$) in bones and teeth. Beyond structural support, calcium acts as a critical secondary messenger in cellular signaling pathways, regulating [muscle …

2. Diet

   Linked via "D"

   Lipids (Fats)
   Dietary fats provide concentrated energy storage and are crucial for membrane fluidity and the transport of fat-soluble vitamins (A, D, E, and K). The classification of fatty acids into saturated, monounsaturated, and [polyunsaturated](/entries/polyunsaturated-fatty-ac…