Mosquitoes carry various diseases such as malaria, dengue fever, elephantiasis and encephalitis, and are associated with health problem in the world. Mosquito repellents on the market contain synthetic ingredients that cause side effects on pregnant women and babies. Herbal repellent is therefore an option for consumers nowadays. The mosquito repellent products from Thai herbs has been developed using micro-emulsion technology to enable them to extend the effectiveness over a longer period than the normal emulsion products and are capable of to control the oil release from herbal extracts as well.