Buy Onguard from Doterra--the company who makes it
I have been using Doterra's Onguard essential oil at my dental hygienist's request for some time now--a number of years. I would always try to find the best price I could from someone selling it rather than through Doterra. The last bottle I purchased on either ebay or Amazon tasted so different that I decided to go to Doterra itself and buy a bottle. Boy--I don't know what kind of concoction I was getting from other places, nor what they were putting in those Doterra bottles, but having just gotten and just begun to use Doterra from the source, I know I have been getting a dud product from other places. Onguard from Doterra tastes wholly different from the versions of it I've bought from other places. I made a huge error in judgment trying to save money. But I paid for it in bogus products. What I was using tasted like lavender oil or not even that. Don't do what I did.