Bio Medical’s Alpha-Stim 100 fulfills all your electrotherapeutic cranial stimulation needs. It treats pain, anxiety, insomnia and depression. It has a proprietary waveform that normalizes your nervous system’s electrical activity. It costs $900.
Here’s an excerpt from the product page:
Alpha-Stim 100 microcurrent technology produces residual and cumulative results, far superior to previous traditional milliampere transcutaneous electrical nerve stimulation (TENS) devices. … the Alpha-Stim 100 is significantly superior because MET works with tiny currents, closer to the type and amount of electricity that naturally occurs in the body. By comparison, the electric current used by typical TENS devices is thousands of times greater than natural body current. Although a slight tingling sensation is sometimes felt under the electrodes, it is not necessary to feel this in order to achieve results. … Do not stimulate directly on the eyes.
Peer-reviewed research suggests that it’s effective for treating anxiety. Quackwatch takes aim at proponents’ outlandish claims and associated woo.
Moreover, I’m not sure if that study was conducted under proper BBG protocols, which mandate hammering 1D6 pointy electrodes into the skull and setting it to 11.