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Why MelanSol
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Choosing SPF
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100% Natural Antioxidant Sunscreen
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TM
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The Vitamin D Health / UV Calculator
Vitamin D Blood Levels
25-Hydroxy Vitamin D Test
Vitamin D sufficiency, along with diet and exercise, has emerged as one of the most important preventive factors in human health. Hundreds of studies now link Vitamin D deficiency with significantly higher rates of many forms of cancer, as well as heart disease, osteoporoseis, multiple sclerosis and numerous other conditions and diseases.
Vitamin D/ UV-calculator
That will take all those factors into consideration and estimate how many minutes of exposure you need for your skin (without any sunscreen) to produce 25 mcg (micrograms) (the equivalent of 1,000 International Units) of vitamin D. In the southern part of the United States you would be advised to stay in the sun with your arms and legs exposed for 10-20 minutes between the hours 10 a.m. and 3 p.m.
Latitude – Longitude - Elevation
To find out LATITUDE, LONGITUDE and ELEVATION (Surface Altitude) go to Google Earth (numbers at the bottom of the screen).

The calculator asks for Latitude N and Longitude E. If your Latitude is S, enter for example -39. If your Longitude is W, enter for example -76. US Cities are always Latitude N and Longitude W (for the W put therefore a “–“ in front of the number).
You may just setting this one to ”Medium”
Keep in mind that the exposure times given are considered enough to maintain healthy vitamin D status. You may also consider your skin type: Darker skinned individuals need more sun exposure than a fair skinned person to make the same amount of vitamin D. If you are starting out with a vitamin D deficiency, you might need more.

Ask your doctor to find out your Vitamin D level.
Deficient
Insufficient
Optimal
Treat Cancer
Excess
< 30 ng/ml

< 75 nmol/L
31 - 49 ng/ml

76 - 124 nmol/L
50 - 70 ng/ml

125 - 175 nmol/L
71 - 99 ng/ml

176 - 249 nmol/L
> 100 ng/ml

 > 250 nmol/L
The calculator also wants to know the "Surface altitude" in km (kilometer). Go to Google Earth and find your location. At the bottom of the screen you will find the elevation "elev" in feet. For example the elevation for Zurich, Switzerland, is 1348 feet. Multiply this number by 0.305 to get m (meters) which is for Zurich 411 m. The calculator wants to know km.
So, insert 0.411.
"Nature of exposure":
You may check "Around midday"
"Ozone layer thickness":
"Surface altitude":
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Vitamin D Health
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Scientists at the Norwegian Institute for Air Research have devised a Vitamin D / UV-calculator.
Sunshine - Natural Source for Vitamin D
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The first and only Natural Certification in the US