There is another intervention for burning feet... Unlike magnesium it does not really CORRECT things, but it will put the burning to sleep quickly.

Biofreeze gel. This is a fast acting gel with 3.5% menthol and an antioxidant more potent than green tea (Yerba Mate-- aka Ilex) which penetrates and stimulates the cold receptors . We have heat and cold pain signaling in our bodies. The cold ones take precedence and override the heat ones which seem to mis-fire often. So the net result is the burning stops.

This eventually wears off, but it lasts quite a while, at least for me. I think the base gel is important because Biofreeze only has 3.5% menthol in it. Other things are much higher including the new Precise cream from Tylenol... but they do not work the same way Biofreeze does. The gel base is non- greasy and goes in quickly. It is quite an elegant product.

Now available on Amazon and other online outlets for less $$ than it used to be.
http://www.amazon.com/Biofreeze-4-Oz-Tube/dp/B0014WK260