The calculator that I referred to in the original post is no longer active, luckily these apps are available and even easier to use than the original!
Opti-D Time Calculator
D VitaMeter
Your skin naturally produces, and then absorbs vitamin D (which is actually a hormone) with sun exposure. In the winter months it is likely that you are not getting enough sunshine to replenish your stores of vitamin D. This niffty calculator will tell you how much sun exposure you would need to get at various times of the year. Only a few minutes every-other-day for the super pale (nearly transparent) like myself and up to 24 minutes if you have darker skin.
As your stores of vitamin D drop, your ability to fight infection decreases leaving you with 3 options:
- Get sick.
- Withstand the freezing temperatures and stand in a t-shirt outside at noon for up to 24 minutes every-other-day.
- Increase the vitamin D in your diet - dietary supplementation.
Sources of Vitamin D...