Barry Lynes' 1987 book The Cancer Cure That Worked by Barry Lynes revived interest in Rife’s claims. The paper claimed that sound waves can create vibrations that break through glass, but the waves produced by a Rife generation were too weak and ineffective to destroy bacteria. There are many different types of health care providers that offer biofeedback therapy. While riffe machines are generally safe, we don't know for certain.
Dr Rife Frequency Therapy