Used this product for the first time this week after noticing a flea problem at out house suddenly. I chose this product because the price was very reasonable compared to other brands at the store. It was a simple application. I just opened the tube and dispensed the liquid straight on our dogs back from neck to mid back. It didn't seem like there was a lot of liquid. I was skeptical because of the price and the little amount in the tube, but the very next day there was noticeably less scratching and our dog seemed more relieved. It has taken care of our problem and bonus, was a lot cheaper than other alternatives. Quality of Ingredients I know there are other more natural cures out there, but I wanted it to work and work fast. It seemed safe and my vet was okay with us using this product. No side effects were noted. Side Effects No side effects were noted in either of our dogs. Our dogs didn't even lick it or try to, which I was surprised about.