No one in the world (well, maybe a couple more private clinics) uses ozone in the treatment of Hepatitis C.
The clinic is not just commercially sharpened, but also, to put it mildly, applies its practices, which simply cannot be in academic medical institutions - they will be expelled.
It is quite simple to check.
EASl and AASLD update the recommendations for the diagnosis and treatment of hepatitis annually. It is enough to search there for the word "ozone therapy" or as Mr. Chornomyz calls it - "efferent therapy". If you find it, throw tomatoes at me.
I advise you to avoid this institution.