I live in the tropics where the humidity is a killer for around 6 months of the year. During the Dry season though I still used to break out in a sweat on my face which there is no hiding. This is quite embarrassing when you have water pouring down your face whilst just standing around talking to someone who doesn't have a bead of sweat on them. The first time I applied the Sweat Block my face did prickle & tingle a bit, but this sensation disappeared after about 10 minutes. I am now on my second week using Sweat Block & had noticed the difference immediately (apparently the more you use it, the more efficient it works). I still will break out in a sweat when doing gardening etc (it is the build up in Darwin after all) but I no longer have rivers of sweat streaming down my face like before & certainly not in circumstances when no one else is sweating. This product has been a godsend. Love, love, love it & will be buying it again.