Aili

The different allergens would be needed at different potencies as they would be resonating at different energies and would be on different levels within the energetic field of the patient eg an allergen that would make a child hyperactive would not be needed on a purely physical level as it's allergic reaction would be affecting the patient more on a mental level.

A good book to read is 'The Field' by Lynn Mactaggert- it helped me to begin understanding the whole concept of energy medicine.