I have brought up some controversial ideas about sun exposure and sun screen. I will post this search for Dr Paul Mason from Australia with his thoughts on the subject. I think very highly of this doctor and his opinions as his opinions are usually based on copious amount of reading scientific studies. Of course he is only human so interprets the studies based on his own personal knowledge and what he experiences with his patients. So I don't claim he is infallible or his knowledge perfect. But I do think his ideas are worth listening to concerning sun exposure. They are not completely mainstream thoughts.

https://www.youtube.com/results?search_query=dr+paul+mason+sun+exposure

Dr Ken Berry, another doctor that I follow quite a lot, also has some things to say that does not fit the mainstream mold.

https://www.youtube.com/results?search_query=dr+berry+sunlight+