I think pretty much everyone is already aware of doing so but just incase your not, dont apply the surge 14 or whatever its called that is supposed to increase growth by itself!! I finally bought some of this, the first time I applied it, I applied castor oil to my scalp, why? I don't know(I guess that was instincts). Second time around was being lazy and just sprayed the surge on my scalp, well later on that night before bed and putting on my head scarf, my forehead the area which the surge was sprayed was burning like H-E- double hockey sticks *lol*, I ran to the bathroom to discover a burn like mark that later turned into a mini scar, its leaving now since I have been applying shea butter, but I am just letting you guys know, thats IF anyone still uses this product, save yourself a scar and apply some sort of oil..