It's in the Rhythm of the Light
How New Zealand sun shapes hormones, immunity and mood
Human physiology still depends on light. The timing of mood, sleep, immunity, metabolism and hormonal rhythms is set by daylight reaching the eyes and UV-B reaching the skin. These systems haven’t changed just because daily life has shifted indoors.
Vitamin D sits inside that network. It’s often described as a simple nutrient, but biologically it acts as…
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