I should have been more specific: what do I say to them in the email? I've never tried reporting a domain before... Just trying to get a gauge on what is the most effective way to do it, if anybody has any experience with this sort of thing...
Send an email or use this link:
https://resellercamp.com/reportJust tell them that he's trying to sell useless supplements, passing them off as a cure against COVID-19. Afaik that's illegal in pretty much any country.