Aromatherapy, a complementary healing system involving fragrant plant oils, has been used for centuries to ease the discomforts associated with pregnancy, childbirth and the postpartum period. Because of the potential risks, the National Association for Holsitic Aromatherapy recommends the use of only a few products for expectant mothers: chamomile, geranium, jasmine, lavender, neroli, patchouli, sandalwood and ylang-ylang. The University of Maryland Medical Center notes that rose and frankincense are safe when applied by trained experts. Other essential oils may increase the risk of fetal harm or preterm labor.
Hyssop Oil
The University of Maryland Medical Center warns that pregnant women should avoid hyssop oil. This moderately toxic essential oil can cause seizures and neurological damage in susceptible individuals.
Sage
Herbalists have traditionally used sage and clary-sage for inducing labor in pregnant mothers. The University of Maryland Medical Center notes that clary-sage, which is frequently used in aromatherapy massage, can alter hormone levels.
Fennel
Oil of fennel owes its sweet, licorice-like fragrance to anethole, an estrogenic compound. A report by the Journal of Ethnopharmacology noted fennel oil's long-standing use for inducing labor and promoting menstruation. It may increase the risk of preterm labor.
Anise
Anise seed oil contains estrogen-altering compounds similar to those found in fennel. Because anise oil could trigger hormonal changes or preterm labor, it is prudent for pregnant women to avoid it.
Rosemary
Aromatherapy practitioners utilize rosemary for its stimulant effects. According to the University of Maryland Medical Center, rosemary essential oil can increase blood pressure. Pregnant women---particularly those with preeclampsia or hypertension---should avoid rosemary and other stimulating essential oils because of this potential risk.



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