Cranial Electrotherapy Stimulation (CES):

Not to be confused with Electoconvulsive Therapy (ECT), CES uses a very small amount of electricity, sent through the brain with small clips worn on the earlobes.  The user typically feels almost nothing in terms of the current, but this technique has remarkable effects for most people, often the first time it is used.  Some companies have devices that are FDA approved for depression, anxiety and insomnia.  There is a substantial body of research backing up its use, making it one of the best kept secrets of the mental health field.  It also has a stellar safety record, with zero reports of long- or even medium-term side effects, after having been used by millions at home, and thousands in controlled, clinical and experimental conditions.