And beyond the performance of the opamp, I would draw attention to safety, if this is meant to be used on humans, but as someone else pointed out already, I think this discussion with the OP has been going on for a long time already, so pretty sure we mentioned it several times.
Power supplies and everything connected to it must be fully isolated (and be aware obviously that isolation is very easy to break just by connecting say one output of your devices to a scope the ground of which will be connected to earth.
Even if isolation is guaranted, since the electrode side is not AC-coupled and the circuit is on a single supply, you will also probably have a DC voltage between the electrode and its return path, which we don't see here. What's the return electrode connected to? If this is to your circuit's ground, that's not great.