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The supply and demand for green beauty today is overwhelming—more than half of women want their skin care to be all-natural, according to a recent survey. But as unaggressive as essential oils (a staple in these products) sound, they have become quite the modern skin aggressor. "In my practice, I see at least two patients a week who are having reactions to essential oils," says Matthew Zirwas, M.D., director of the Ohio Contact Dermatitis Center. According to a systematic review in The International Journal of Risk & Safety in Medicine, lavender, peppermint, tea tree, and ylang-ylang oils are the most likely to cause an allergic reaction (though one Polish study showed adverse reactions to 35 different oils!).
Learn about some of the crazy DIY beauty treatments women have used over the years:
FOR SERENITY NOW: Skip the essentials.