I was wondering if you'd be able to extract 5 volts (or even just 3) from the human body. I recently discovered in an experiment that just putting a wet strip of aluminum foil over your forehead can produce about half a volt. I was wondering if I could take this one step further and get enough energy to power an LED. I also noticed that the place on your skin that produces the most voltage is your forehead. Where else could I put foil? And would, all of it combined, produce 3.3 volts? Thanks in advance!
This seems more like a question for one of the stack exchange science networks, like physics or chemistry. Also the best way to generate more voltage would be either through static electricity or, as someone else commented, accessing the electricity generated by your nerves through internal electrodes. I do not recommend the second option since it could be dangerous and painful. Through personal experience accessing the electricity in nerves involves having small needles in your muscles which is not to fun.