Sublingual immunotherapy is a customized treatment administered by medical doctors. What do you mean by dangerous?
(I'm not affiliated with https://www.wyndly.com/, but that could be a good place to start for those unfamiliar.)
(I'm not affiliated with https://www.wyndly.com/, but that could be a good place to start for those unfamiliar.)
Also, suggestions like those usually bring out the quackery in people, with things like "Oh, hayfever? Let's cure it by doing summer holidays on the farm!" and "Oh, peanut allergy? I have a sandwich for you, kid!".