❓ why
Why do our bodies make vitamin D from sunlight?
Human bodyNutrition
Quick Answer
UVB light helps the skin start a chemical reaction that produces vitamin D3. The body then processes it into an active hormone-like form.
The Full Story
When ultraviolet B rays hit the skin, they convert a cholesterol-like compound called 7-dehydrocholesterol into vitamin D3. The liver and kidneys then modify it into calcitriol, the active form that helps control calcium and phosphate balance. This supports bone health and normal muscle and nerve function. Because sunlight exposure varies by season, latitude, and skin tone, many people also rely on diet or supplements.
Key Facts
1.UVB light triggers vitamin D3 production in skin
2.The liver and kidneys activate vitamin D
3.Vitamin D helps regulate calcium and phosphate
YouTube Angle
Suggested video title for this topic:
"Sunlight turns your skin into a vitamin factory."