Reply To: COA vs COC Share ideas, questions and answers Search for: Home Page › Forums › Regulatory › COA vs COC › Reply To: COA vs COC Anonymous Reply To: COA vs COC December 1, 2020 at 8:33 am Hi Anon, By ‘control product’, I assume you mean a commercially available comparator or standard-of-care product. I’ve experienced that before. It isn’t unusual and shouldn’t pose any issues. Best, Dave