Desensitization to peanuts has been in the news recently. Here is a brief summary by The Economist. Sensationalism-free for your reading pleasure.
This is exciting research, and I hope it helps many. An important reminder from the article, however:
This is not, the researchers emphasise, an experiment that anyone should attempt at home. Even under medical supervision adverse reactions occurred. Most were mild, but one person had to be treated twice with adrenalin—and, not surprisingly, then withdrew from the study.