I also had great success with the grapefruit seed extract as a deoderant. I have bo just in my armpits that is heat activated. The Grapefruit-Seed-Extract totally got rid of all odor. BUT.....I have found out since, like all antifungals, they have to be rotated or they lose their potency. The Grapefruit-Seed-Extract stopped working, somewhat, for me after about six weeks. So, I quit using it for a few weeks and am about to start trying it again. I think from now on I will use it every other month and try something else in between.