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Vitamin D Synthesis Calculator
Skin type + latitude + season + exposure → daily vitamin D
Interactive Tool
Vitamin D Synthesis Calculator
Estimate daily vitamin D production from sun exposure based on your skin type, latitude, season, and exposed body area.
Estimated vitamin D
574 IU
Daily requirement met
72%
Estimation based on Holick 2007 model. Aim for 600-800 IU daily (4000 IU upper limit). Excessive sun increases skin cancer risk — moderation and SPF use after vitamin D dose are recommended.