Of course he's going to say that--he is a skin specialist.
It only takes approx 15 minutes a day of sunshine so your body can have vitamin D naturally.
Sunscreen is one of the reasons so many people are deficient, besides a poor diet.
I burn very easily but I can be outside for 15 minutes without any redness. Of course one shouldn't go out in the hottest part of the day. Good way to get a sunburn.
I am allergic to sunscreen so don't use it anyway--am just mindful of how long I have been out.