Scouse, I use the potion sometimes, when I go out and that. Even when I try to apply it carefully to my hair, I have the feeling that some of the powder goes to the scalp, probably blocking the pores. The safest way I suppose is to apply first minoxidil, allowing it to dry as long as you can, and then use the potion. And I always do a more careful hairwash than usual the next day.