Controversies as to the daily use of sun blockers
remain. Concerns have been raised about the safety of
micronized titanium dioxide, topical oxybenzone, and the
sunscreen additive retinylpalmitate. The FDA and consumer
groups are conducting studies about the localized
effects, such as carcinogenesis, and potential side effects of
systemic absorption.70 Many discussions are arising daily
regarding use of sunscreens versus vitamin D and calcium
metabolism. In theory, correct usage of sunscreens should
significantly reduce vitamin D levels, but this is not the
case in practice.