No - these masks are non-medical grade. You may use them on their own and add your own additional filters, or you may layer them on top of medical grade masks. The more layers of filtration the better. I have specifically designed my face masks with features that are in accordance with governmental suggestions on non-medical handmade face mask construction. All Masks and PPE accessories sold on this site make no claim to protect agains COVID19 or any other viral infection. For more information regarding non-medical face mask usage and suggested materials, please consult official Governmental guidance information here or you can review a summary below sourced from the government of Canada's website: "A non-medical mask can be bought or homemade and should be made of: • At least 2 layers of tightly woven fabric, such as cotton and • A third, middle layer of filter-type fabric, such as non-woven polypropylene You can include a filter in your non-medical mask by: • Adding a filter fabric as a middle layer • Inserting a disposable filter into a pocket on the inside of the mask Reusable masks with an integrated filter layer can be washed multiple times."