How to calculate the vitamin D amount from the sun

Just put in latitude, skin coloration, time of day, time of year, altitude, latitude and the type of surface you are on. That is, sand, concrete, grass, and snow etc. Don't forget if you are a older person, like me at 71, efficiency of conversion can be as low as 20%. There are no documented cases of people becoming toxic from a combination of supplements and sun. Also if you cut back on your vitamin D and you start hurting, it is probably because your blood level dropped. This can happen in as little a day or two.

copy and paste the address below....

http://nadir.nilu.no/~olaeng/fastrt/VitD-ez_quartMED.html