Refreshing peppermint cools the body, focuses the mind and keeps you alert while calming the nerves. Peppermint and eucalyptus open the sinuses and are beneficial for the upper respiratory system. They alleviate sinus and migraine headaches, toothaches and digestive ailments including nausea, vomiting, diarrhea, constipation and colic. Peppermint and eucalyptus help diminish bruises, muscle and joint pain, insect bites and relieve skin irritation and itching. Eucalyptus lowers fever and kills up to 70% of local, airborne staphylococci. Peppermint should be kept away from eyes and is best avoided by pregnant women and nursing mothers.