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The key is taking magnesium citrate. Those other pills have very low absorption rates.
Transdermal patches do work. But they are designed to do so. It's not quite as simple as just putting the medication on the patch. It's pretty hard to break the skin barrier. https://en.wikipedia.org/wiki/Transdermal_patch
I've got a friend who's a doctor who has worked on a couple of transdermal delivery systems. It's a very exacting science. DSMO is one chemical that goes through the skin easily.