Eh, the author did give some examples of bad chemicals in some sunscreens, so it's possible that there are negatives to using them. Here's what I took away: -

Eh, the author did give some examples of bad chemicals in some sunscreens, so it's possible that there are negatives to using them. Here's what I took away: - don't use sunscreen most of the time (though if you care about aging effects, go for it on your face) - avoid getting sunburns, and use sunscreen as necessary given your desired time in the sun - check labels of sunscreen and get familiar with the common active ingredients That's basically what I do already, though I'm going to make an effort to spend more time in the sun because I work at home, and therefore get minimal sun exposure normally.