For which oils is there a caution regarding pregnancy due to potential uterine stimulation?

• A. Arnica, basil, clary sage, cypress, juniper, myrrh, and thyme
• B. Rosemary, sage, and thyme
• C. Chamomile, clove, ginger
• D. Tea tree, lemongrass, patchouli

Answer: (A)

Some essential oils can stimulate uterine contractions, so they carry a pregnancy caution because of the risk of triggering labor or miscarriage. The oils listed here are known for emmenagogue or uterotonic effects, meaning they can influence uterine activity. Arnica is avoided in pregnancy due to potential irritation and other risks; basil has emmenagogue properties; clary sage is well known for its uterotonic and estrogen-like activity; cypress, juniper, myrrh, and thyme are also associated with stimulating uterine contractions in higher concentrations or in certain preparations. Because of these potential effects, products containing these oils should be avoided or used only under professional guidance during pregnancy.

The other options include oils that aren’t as consistently linked to uterine stimulation in standard references, so they don’t align as clearly with the question’s focus on pregnancy cautions for uterine activity.