Prescription drug

Where is Betula Populifolia Pollen made?

3 companies 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. White Gray Birch Pollen1 g per 20 mL · NDC 54575-940The label doesn't name the factory. Plants this company names for other drugs
Antigen Laboratories, Inc. White Birch0.05 g per 1 mL · NDC 49288-0080The label doesn't name the factory. Plants this company names for other drugs
Nelco Laboratories, Inc. White Birch0.05 g per 1 mL, 0.1 g per 1 mL, 10000 [PNU] per 1 mL, 20000 [PNU] per 1 mL, 40000 [PNU] per 1 mL · NDC 36987-2554, 36987-2555, 36987-2556 +5The label doesn't name the factory. Plants this company names for other drugs