There can be some side effects. A phosphene (a brief flash of light) at the start of stimulation, headache, dizziness and nausea. Ok, I'm gone at the mere mention of nausea. The one to two milliamps that are used isn't enough to make neurons start firing but the therapeutic value hasn't totally been established either. Granted the dose of electricity is very small compared to the doses used for clinical depression or seizures. Studies have indicated that it is safe for a single use stimulation but results aren't in for long term stimulation.
My problem with all of this is people get on the bandwagon and some person will figure out a way to have a DIY (do it yourself) way to assemble this and start opening clinics. Once that happens all legitimate research is tainted. It will absolutely fall under the category "that some is good, more is better and too much is just enough." Laboratories and universities have protocols in order and once you get outside of that arena all those safety protocols go out the window.
I just want to know is how they figured all this out.
How many brains did they have to melt?
Again, with proper safety protocols...........