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Clary sage oil appears safe for use.
Various sources make claims about clary sage oil increasing estrogen in the body, but at least one 2017 study that investigated the estrogen-boosting effects of different essential oils did not seem to agree. The study did, however, suggest that geranium and rose otto essential oils might boost estrogen.
Other supposed risks or side effects of clary sage oil seem to be largely anecdotal and appear not to be well supported by research.
A reasonable precaution would be to test a small area of skin before applying the oil to large areas of skin and avoid using clary sage oil before driving or operating heavy machinery. People should also stop using clary sage oil and consult with a medical professional if any issues arise. *