The phrase "unproven therapies" refers to treatments or methods that haven't been scientifically tested or proven to be effective and safe for specific conditions or diseases. Full definition
Who gets to say when unproven therapies can be offered to desperate people? (newscientist.com)
He worries that they will «provide cover» for clinics that sell unproven therapies. (newscientist.com)
Patients who participate in testing experimental stem cell therapies, whether in regulated clinical trials or from clinics offering unproven therapies, are pioneers. (closerlookatstemcells.org)