"Are reactions seen with "chemical" sunscreens from the active ingredients or more from the inactive ingredients?"
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It is difficult to tease out which specific ingredients are the sole reason for an irritant or allergic reaction, as these are all parts of complex formulations. However, there are some ingredients that have a higher chance of causing an allergic or irritating reaction, but of course concentration is key. So to answer your question, it could be due to actives or both active and inactive ingredients combined. For a sensitive skin, physical sunscreens (ZnO/TiO2) are better because they are less likely to cause irritating or allergic reactions.

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