Livestrong dot com says magnesium malate is commonly used to treat fibromyalgia.
Here is a factsheet from ods.od.nih.gov on mag supplements.
It only shows how much mag the supplement contains. It does not address the bioavailability of the form of magnesium. For example magnesium oxide is often listed as being only 4% bioavailable even though the supplement contains 60% magnesium.
The LOWER the stability constant the more ionized (bioavailable) the magnesium becomes at the pH of the body.
Magnesium chloride 0 [totally ionized]
Magnesium acetate 0.51 [essentially ionized]
Magnesium propionate 0.54 [essentially ionized, animal feeds]
Magnesium gluconate 0.70 [essentially ionized]
Magnesium lactate 0.93 [essentially ionized]
Magnesium succinate 1.20 [essentially ionized]
Magnesium malate 1.55 [essentially ionized]
Magnesium citrate 2.80 [essentially ionized]
Magnesium glycinate 3.45 [not listed or not available]
Magnesium malate has a higher stability constant than the chloride, acetate, lactate, and gluconate forms, but it still becomes essentially ionized whereas magnesium chloride becomes totally ionized. Magnesium malate appears to be a decent supplement though there are some forms slightly more bioavailable.
BTW, I was just reading about a talk given by Dr. Gerson which included statements about how his clinics used coffee enemas
to open the bile ducts which assisted detoxification of the liver. Coffee enemas and a raw juiced drink made from equal parts calves livers and carrots seemed to be very important parts of his disease detox program.