It is a common household product, it is used in some bread-based food and also as a cleaning agent. You probably have some lying around the house. I certainly wouldn't recommend it on the basis of my current reading, but it is interesting and worth further research.
As with the lot of these things, on paper it makes sense and a couple of studies might back it up, but the body is amazingly complex and although it might flick a switch on in one area (that increases exercise endurance) it might flick a few off in another.