I too have been extremely curious. I've asked two different doctors (sleep specialists) and neither had an answer. I looked it up on the FDA and it is not sanctioned by them. If I could find any sort of credible evidence that they are safe and effective I would buy one in a heartbeat.
Hello all! This is the first time I've visited this forum. I'm new to the forum but not to CPAP. I am likely the dinosaur around here. I've been using CPAP continuously since 1992. That's right, more than 25 years. Back then no one had heard of CPAP and even most doctors didn't know what sleep apnea was. My first sleep study recorded 66 apneas per hour. CPAP absolutely transformed my life. I had been having such severe memory problems that it became difficult for me to work. At the time there, of course, was no support group and almost no literature about sleep apnea or its effects. Even the technician that brought me my first machine knew next to nothing. He told me that I should be careful because the machine could cause me to "blow a lung". I now know that was a stupid thing to say, but I too was ignorant, as well as confused and a bit scared.