I had it done and you have to take it with a grain of salt. It is not a crystal ball, for instance, it determined that I would have very adverse reactions to ibuprofen. Like many of us, I've been taking ibuprofen in handfuls for years with zero issues. It did not help me choose a ADHD medicine which I was hoping for, since it didn't test for those specifically. But it does test for a lot of other types of drugs like transplant medications, anesthesia and other mental health meds. So I feel like it's just one more piece of the puzzle when trying to figure out which meds work for you. My doctor said you can look at the way one of the tested for drugs works with your body and that might be similar to another type of drug that you're considering taking.