I bought two, one for me, one for my boyfriend. He gave up after first night, I took a little bit longer, but in the end I also gave up. First of all it has quite strong, irritating and unpleasent smell, second it feels uncomfortable on feet, third it doesn't stay on feet all night, so it doesn't have any use, and for those reasons I don't like it, and also I don't know if that works, because I didn't feel any difference after few night, even if I supposed to feel it after the first one. It did change the colour like it sais, but I guess it is the reaction of your sweat with herbs which are in sachet, so that doesn't mean anything to me.