DEET is a highly effective active ingredient used in insect repellents. It has been used since the 1940s and offers reliable protection again mosquitos, ticks, fleas and biting flies. It is essential to use it in areas where malaria and other diseases are present. Rather than killing, DEET binds to insects' sensory receptors, making it difficult for them to detect human scents.
DEET is considered safe for pregnant and breastfeeding people and babies over 2 months old. When applying to children, you should apply it to your hands first and then gently rub it onto the child.
It is important to note that DEET is a strong solvent and can melt or damage synthetic fabrics like plastics. Contact with eyes can cause severe stinging, and DEET can irritate sensitive skin.
Higher concentrations of DEET do not make it work better, just last longer.
DEET concentration explained:
20–50% DEET: general outdoor use, suitable for low-risk countries, reapply every 6–8 hours
20–40% DEET: endurance formulas, suitable for high-risk areas (Sub-Saharan Africa, South America, Asia), lasts 10–12 hours, suitable for children 2+
50–95% DEET: maximum protection in high-risk areas, not suitable for children under 6, lasts 8–10 hours. You'll find this in products like Lifesystems Expedition MAX.