They cost 100/piece. I head on this forum that the laser is too weak to penetrate the skull. But actually, I do feel it inside, not sure how deep, but I feel it below skin level and it has made me feel three times out of five worse. They also do it on the neck which I thought is good. But I feel worse after the session and more dizzy.

They reduced twice the intensity of the diode, and it is still bothersome. Wonder if this is how it should be.

I tried neuro-feedback and it also made me feel worse.