Sceptical at first but it works! – I was very disbelieving when I first saw this advertised as I had tried other 'natural' and 'long term' deodorants before with no success. I ordered the sample pack first and read through the instructions, making note that it can take a few weeks to start to work properly. Following the instructions, I used it the first time right after a shower and used it everyday for the first 2 weeks. Now I can go a few days without using it, but I still tend to use it most days out of habit. You only need the tiniest amount so I expect it will last a really long time to! Don't expect this to stop you from sweating, that's not it's purpose, but it does definitely control the smell if you give it time to take effect.