How does the body make vitamins from sunlight?
Quick Answer
Sunlight helps the skin produce vitamin D after a chemical reaction begins in the skin. The liver and kidneys then change it into its active form.
The Full Story
When ultraviolet B radiation from sunlight hits the skin, it converts a cholesterol-derived molecule into vitamin D3 precursor. The liver then modifies it, and the kidneys complete the activation so the hormone-like vitamin can help regulate calcium and bone health. This process links the skin, liver, and kidneys in a chain of biochemical steps. Because the body needs only limited exposure, excess sun is not required and can be harmful. Vitamin D synthesis is one reason sunlight affects health beyond just vision and mood.
Key Facts
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