Want proof of sublingual allergy drops success for hay fever? First trial was 100 years ago!

Boston Children's hospital looks at the history of various modes of allergy immunotherapy. Oral immunotherapy (ingested), sublingual immunotherapy (under the tongue) and subcutaneous immunotherapy (allergy shots). Allergy drops' origin with hay fever and recent successes with oral immunotherapy for food allergies are highlighted. Sublingual immunotherapy eg. Pollenguard Allergy Drops, while not for food allergies, have safely eliminated pollen allergies like hay fever for decades. Shots are mixed blessing, painful and needing supervision.

http://childrenshospitalblog.org/100-years-of-allergy-treatment/