My hubby had horrible dog & cat allergies and asthma...couldn't spend more than an hour in a house with them. He had shots as a kid and didn't have a huge amount of success, and as an adult his allergies were getting worse -- especially around fall ragweed and mold seasons. He tried allergy drops - has been on them for about 4 years. No more problems with dogs, cats or ragweed and is off all of his meds (hasn't had to use his inhaler for 3 1/2 years)! He takes his drops three times a day religiously and it has made a huge difference for him.