Oral immunotherapy involves training your body to no longer have allergic reactions after minimal exposure to an allergen. To achieve this, your medical provider will monitor you while you eat a small amount of a food allergen such as peanut butter. Overtime, the goal is to increase the amount of allergen you consume without having an allergic reaction.
Sources:
American College of Allergy, Asthma, and Immunology (acaai.org)
The American Academy of Allergy, Asthma & Immunology | AAAAI