if I know I'm gonna be in the woods for a while, I load up on B vitamin and Iron supplements..they thicken your blood and make you less appatizing. I only use Deet products on ankles (socks and pant bottoms), elbow pits, just behind arms on shoulder blades and back of neck....the areas most targeted by biting savages. After Rocky Mtn. Spotted Fever I give no quarter to blood suckers.