Why is ozone therapy illegal?

Could you elaborate on the reasons behind the illegality of ozone therapy? Is it due to its potential risks to human health? Or is it because of a lack of scientific evidence supporting its effectiveness? I'm particularly interested in understanding the regulatory framework surrounding ozone therapy and why it has been deemed unsafe for medical use. Could you provide some insights into the scientific community's stance on this topic? Additionally, are there any alternative therapies or treatments that are considered safer and more effective for similar purposes? Thank you for addressing these queries.