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Originally Posted by cadre
This is right except the part about there being no over-protection. It is not a good idea to wear sunblock on all your skin exposed to the sun all the time. You will develop a Vitamin D deficiency, 90% of the vitamin D in your system comes from exposure to sunlight. If you're going to wear sun block leave at least a part of your skin bare, and the best thing would be to change which area that is.
I'm no expert, but this is what I have learned recently. Just thought I would point it out.
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Sunblock does not actually block the sun's rays completely. Some sun gets through. The word sunblock is a misnomer.
But the recommendation is to get 15 minutes of sun without sunscreen to get your vitamin D. However, this is probably best done in the morning, before the sun gets fierce.