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The science of calm skin, explained


Evidence-based guides on cortisol, the five senses, ingredients, and Rituals. Grounded in peer-reviewed research and reviewed by Dr. Walter J. Joseph, MD.

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Does stress cause bad skin? What the research says about cortisol
Breakouts, dullness, and a barrier that won’t recover often track your stress more than your routine. Here is what the evidence actually shows about cortisol and the skin – and what lowers it.
Reviewed by Dr. Walter J. Joseph
Updated Sep 2026
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