Analysing these high-standard studies revealed that tDCS seems to reliably improve the symptoms of depression, addiction and craving, and fibromyalgia. It also uncovered that the technique does not work for tinnitus, and that the evidence for using tDCS for stroke rehabilitation was not as strong as many had thought.

Full article: Zapping the brain really does seem to improve depression

Full Paper: Evidence-based guidelines on the therapeutic use of transcranial direct current stimulation (tDCS)