Children walk among hexagonal rocks in Sai Kung. Photo: May Tse

Benefits of vitamin D should be crystal clear

Hexagonal structures are not rare in nature. For instance, the crystals in our bones and teeth, the apatites, are hexagonal. These apatite crystals contain calcium. The main fraction of calcium of our body is located in bones. Calcium comes from our food, and for its optimal absorption from intestines we need vitamin D.



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