@Terry Page you wouldn't have to worry about the digestive process destroying magnesium, an elemental metal, but the digestive side effects are a different matter. I seldom have trouble with oral supplements, but as I said, my wife uses the topical as her gut flora is compromised.
I guess in my case @Don Alaska , using kefir, it didn't somehow agree with my gut flora either I also take hypertension pills so who knows what goes on with the mix I am very happy with the results anyway and it's a very cheap solution