The active constituent DEET is effective against stinging insects as well as ticks. DEET provides the most effective protection against (malaria) mosquitoes, gadflies, ticks and bloodsuckers, and is reasonably effective against large horseflies and midges. Care Plus® recommends a DEET percentage of between 30% and 50%. An insect repellent with a DEET percentage of less than 30% may not be effective, and a percentage above 50% has no added value.