There are several telltale signs of unproved therapies. Most journals require rigorous proof of efficacy before they allow a claim to be published. Be wary of people who ask for a lot of money for an experimental therapy. Most legitimate clinical trials will not ask for large payments for unproved therapy. Investigate the risks.
Most therapies have risks.
Carefully weigh the risks and benefits of the therapy. Many people believe that they have nothing to lose. Everybody has something to lose.