My Dr.'s info and what I have read, if you do not have problems from the sun, it's okay to go without sunscreen for 15 min. That's enough time to get a lot of Vitamin D. But it's easy to just to take Vitamin D if you have to use sunscreen. Sunscreen blocks Vitamin D. I think natural sunlight is the pure stuff so I try to get 15 mins a day in it with at least 20% of my skin exposed to the sun. I do keep my face protected. Don't need anymore wrinkles.