Peppermint Helps Nausea Nausea and vomiting are common problems of anesthesia from surgery, chemotherapy for cancer, and pregnancy. Whatever the cause, the research shows that peppermint essential oil can help. Serotonin is a neurotransmitter best known for preventing depression and insomnia. Less known is that there are serotonin receptors in your digestive tract. Even less known is that peppermint essential oil has been shown to block the serotonin receptors in your gastrointestinal tract that trigger nausea and vomiting. So, could inhaling