A method for testing, treating, and preventing delayed food allergies includes: receiving detailed symptom, medical, and dietary histories from a patient formulating a combination of one or more food extracts at selected concentration for sublingual administration over a trial period determining whether the patients symptoms have improved, worsened, or had no change, in response to the administration of the combination and altering the combination in response to whether the patients symptoms have improved, worsened, or not changed, so as to induce immune system food tolerance.
