Peanut protein powder
[Snip]...In a clinical trial, researchers did what might seem like a recipe for disaster: administer tiny daily doses of peanut protein powder to patients with peanut allergies. The amount was gradually increased over six months to build tolerance.
I know someone who was deathly, and I do mean deathly (worse sensitivities I’ve ever seen in my life) who was desensitized through a clinical study with sublingual drops.