I'd really like to get that done - at least I'd know where I stood then.
I've just started taking something called magnesium ethanolamine phosphate. Have you ever heard of this? It is made by a company called BioCare and was quite expensive. It is supposed to be quite well absorbed.
I raed on a website that liquid magnesium chloride is actually not easily absorbed orally.
Apparently people sometimes need introvenous injections of magnesium to kickstart the whole absorbtion process. The more deficient in magnesium you become, the less the body is able to absorb it.