Everybody should do what they believe in, but bringing up things like rust, noone is helped by it. The object of a supportforum is that everybody gives their experiences so other people can make up their own mind which way to go.
There are so many different protocols.
The magnesium is used as a matrix to get the oxygen in the intestines and most of the magnesium is not absorbed by the body.
Here is a non-commercial link from a CZ post how it works. //www.curezone.org/forums/m.asp?f=329&i=3732 Epsom Salts and things like Milk of Magnesia pull water from the body oxygen products don't.