Prescription drug

Where is Quercus Alba Pollen and Quercus Rubra Pollen and Quercus Virginiana 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
Antigen Laboratories, Inc. Number Three Oak Mixture0.0167 g per 1 mL · NDC 49288-0357The label doesn't name the factory. Plants this company names for other drugs