Supplements: how to distinguish a bona fide manufacturer from an unscrupulous one?

Preparations of our production:

On prescription:

Azithromycin Ecomed® tablets 500 mg , Amoxicillin Ekobol® tablets 250 mg , Amoxicillin Ekobol® tablets 500 mg , Amoxicillin tablets 250 mg , Amoxicillin tablets 500 mg , Amiodarone tablets 200 mg , Verapamil tablets 80 mg

Over the counter:

Vikalin tablets