The two reasons I stay here are that I love the community, and that I occasionally can share DS's experience with OIT for peanut. The link is the center he went to. I have not read it over recently, the website is very different from in his day, as it has greatly expanded. He was patient #104. When he started, we were told that none of the previous 103 had had a serious reaction, but most had had some minor reactions, most often nausea and/or vomiting at some point after increasing the dose. AFAIK, there were no serious reactions while he was going through treatment.
His experience was smooth sailing. He never experienced even a minor reaction and was lucky enough to remain healthy in all other ways during that time. I am very happy we did it. It makes a world of difference.
That said, my nephew's wife tried it as well. Different study, one meant for adults. She had three anaphylactic reactions (all of them in the office I believe, so as bad as it was, it was better than at home), and had to drop out of the study.
https://nefoodallergy.org/