Prescription drug

Where is Quercus Nigra Pollen and Quercus Stellata Pollen and Quercus Velutina Pollen made?

1 company sell it under their own name. None of their labels names the factory.

Companies and their factories

Company on the labelFactoryWhereLast FDA inspection
Allergy Laboratories, Inc. 3-Oak Mix, Black/Blackjack/Post Pollen0.33 g per 20 mL / 0.34 g per 20 mL · NDC 54575-953The label doesn't name the factory. Plants this company names for other drugs