Did you know that you can use your iPhone or iPad to help you make vitamin D?
There is actually an app, D-Minder, that can do just that.
No, it will not turn the screen of your mobile device into a UV-lamp.
Instead it will tell you the possibility to get vitamin D from sunlight at your location.
It does so by calculating when (or if) the sun is high enough in the sky for its UVB-rays to reach you.
If the sun is not high enough, the D-Minder app automatically calculates the next opportunity to make vitamin D from UVB in sunlight. It might be minutes, hours or days away.
Watch the video about the D-Minder below.
Thorough readers of my blog will notice that the app is using 35 degrees as the lower angle of the sun for UVB to reach you while I normally talk about 45-50 degrees. The fact is that UVB doesn’t have an on/off switch like a lamp. Instead the amount of UVB is gradually increasing or decreasing when the sun is rising or setting. Below 45 degrees, the time to get enough vitamin D will be much longer. Therefore you will need to expose yourself to unnecessary amounts of UVA in order to get the same amount of vitamin D.
As will all apps, D-Minder can be downloaded directly to your iPhone or iPad from the App Store. Or it can be installed via iTunes on your computer.
The D-Minder app comes in one free version and also in a Pro-version for 1.50$.
In the Pro version, you can see your exposures' history and you will be able to schedule future events for next exposures.
I have bought and installed the D-Minder Pro on both my iPhone and iPad. Unfortunately, for the location I am right now, D-Minder is telling me that the next opportunity to get vitamin D from sunlight lays 242 days in the future.
So, the only thing to do is to use the iPhone to find the nearest indoor tanning salon.
Here is the link to D-Minder on iTunes.