Today we opened the first sunscreen of the summer a Neutrogena stick containing titanium dioxide and zinc sulfate. Total cost for a small small stick: $7. Ouch! The California Baby version is $15! This works out to something like $1 an ounce or more. I personally am trying to avoid using the "synthetic" sunscreens on kids out of concern for estrogen-like effects. I haven't seen correlations with health outcomes per se but I would rather not add risk especially in my daughter where I don't need to. The titanium based sunscreens do not appear to have a hormonal effect on biology.