Integumentary / VISUAL EXPLAINER
How Does Sunlight Help Your Skin Make Vitamin D?
UVB light starts a chemical conversion in skin that leads to vitamin D3. Further processing in the liver and mainly the kidneys produces active vitamin D; UV can also damage skin.
READ THE IMAGE
What the illustration shows
Navy-and-gold poster asks how sunlight helps skin make vitamin D. Gold UVB rays enter a peach skin cutaway; labels identify the epidermis and the dermis, with red and blue vessels below the epidermis. Text says sunlight supplies energy, not vitamin molecules. Three abstract blue and gold symbols show skin precursor, 7-dehydrocholesterol, changing through previtamin D3 to vitamin D3; arrows are labeled UVB light and heat. A disclaimer says the symbols are not chemical structures. A separate strip shows vitamin D3, a liver, paired kidneys and an active-vitamin-D symbol, labeled first and further processing, mainly kidneys. A red-bordered warning says UV can damage skin and this is not advice to seek extra sun. Gold AllHumanBody.com and the complete brand slogan appear at the bottom.
How to interpret this poster
- Heat means thermal conversion within skin, not external heating advice. No exposure duration, tanning recommendation or supplement dose; molecules are symbols.
- AI-assisted educational illustration; not physician certification, microscopy, a diagnosis or individualized medical advice.
- Fine annotations need enlargement; the full description provides an accessible text alternative.
- Display the full uncropped illustration; do not trim titles, legends or boundary annotations.
AI-assisted educational illustration, adapted into web-sized images without changing its composition. This is general education, not an individual diagnosis or treatment recommendation.
EVIDENCE / CONTEXT
Sources and what they support
- NIH Office of Dietary Supplements ↗
UVB conversion of 7-dehydrocholesterol to previtamin D3 then D3, activation in liver/kidney, and UV carcinogenicity.
- NIH skin overview ↗
Skin makes vitamin D; epidermis/dermis structural context.
- Primary human-skin thermoisomerization study ↗
Thermal conversion of previtamin D3 to D3 in human skin.
Evidence correspondence is limited to the abstract.