If you qualify for Nectar Prescription Allergy Drops, your two most prominent allergens will be compounded in your customized allergy drops. The extracts selected for your drops are chosen based on your allergy test results and your clinical history with allergies. Research has demonstrated when too many allergens are mixed, there is decreased effectiveness in symptom improvement. Several studies suggest that two allergens in your customized formula are enough to lead to improved symptoms and tackle the root cause for all of your allergies, not just those related to the allergens included in your drops.