I have had seasonal allergies for most of my life and this product has been the best for relieving itchy eyes. I was recommended this product by my doctor and has lived up to the reputation. My eyes are so miserable right after I wake up but once I put the eye drops in, I feel like a new person. One time i bought a knock-off brand and I could tell a huge difference in the lack of quality in the knock-off brand. I have stuck with Zadiator ever since that moment.