Discover when it's possible for your body to produce vitamin D naturally
The return of the sun
Just because the sun is shining, it doesn't mean that your body can produce vitamin D. Our Vitamin D Sun Calendar tool calculates the times when the sun is high enough in the sky at your specific location.
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Why Use Our Vitamin D Sun Calendar?
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Personalized to your exact location
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Daily and seasonal vitamin D synthesis windows
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Based on scientific research and solar position calculations
The Science Behind Our Tool
Our calculator uses the concept of the "vitamin D zenith angle" to determine optimal conditions for cutaneous vitamin D production. Effective synthesis occurs when the sun is at least 50 degrees above the horizon, allowing sufficient UVB radiation to reach your skin and initiate the conversion of 7-dehydrocholesterol to previtamin D3.
By factoring in your geographical coordinates and time of year, we provide accurate data on when your body can produce vitamin D naturally, helping you make informed decisions about sun exposure and supplementation.
Beyond UVB: A Holistic View
While our tool focuses on UVB exposure, remember that vitamin D synthesis is influenced by multiple factors. Understanding these can help you optimize your vitamin D levels more effectively.
Physical Factors
- Skin pigmentation (melanin)
- Age-related skin changes
- Body Mass Index (BMI)
Environmental Factors
- Altitude
- Atmospheric conditions
- Time of day and season
Lifestyle Factors
- Sun exposure habits
- Clothing choices
- Dietary intake
Our calculator provides insights on UVB exposure, but remember to consider these additional factors when optimizing your vitamin D synthesis. For a comprehensive approach, consult with a healthcare professional.
Ready to Optimize Your Vitamin D?
Use our Vitamin D Sun Calendar below to get personalized insights for your location.
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Location Details
Vitamin D Synthesis Summary
The point is too far from the equator to allow for any vitamin D synthesis. has a high enough sun to produce vitamin D on days of the year, with the sun being high enough for an average of minutes per day across the year.
After winter, the first day when it is possible to synthesize vitamin D is , with the sun remaining high enough to do so until .