The Grapefruit-Seed-Extract stopped working under my left armpit. So, I decided before it had a chance to stop working on the other side, I would give it a rest for about a month. Then try it again. Going forward, I think I will use it every other month so my body doesn't become immune to it. The Grapefruit-Seed-Extract did work incredibly though for about six weeks. NO odor at all.