No published studies have demonstrated toxic effects of sunscreens in humans. Case reports suggest there is an increase in the frequency of photocontact dermatitis among patients who are frequent sunscreen users and who have photodermatoses such as polymorphic light eruption. There is no evidence that sunscreen use affects vitamin D levels.25 Using sunscreen does not cause adverse effects on reproduction or fetal development, although some effects have been seen with high oral doses of sunscreen ingredients in animal models. In some experimental conditions topically applied sunscreen (in the absence of UVR) affects the immune system but most toxicity studies have shown that the active ingredients in sunscreens are safe when applied topically at recommended concentrations. DNA damage has been reported in one study.25
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