Get some sun every day.  Ten to fifteen minutes of unprotected sun on the face and arms is enough to manufacture your needed Vitamin D.  Use sunscreens or sunblocks that contain titanium or zinc oxide.  Stay away from “nano” particles.  Keep infants of six months or younger out of the sun, and don’t expose them to any sunscreen.  Seek shade between 10 am and 2 pm.  Use a broad brimmed hat, and lightweight, loose-fitting, long sleeves.  Eat your carotenoids.  (The way plants protect from the sun.)