Going back to the Myhill article about magnesium, I tried her suggestion about rectal administration last night, because she said that for some people it was as effective as injections and I was wondering if it would be useful for my son. I used sea minerals, which have magnesium chloride, and I mixed enough for about 500 mg of elemental magnesium (which was 1.5 teaspoons, she recommends no more then 600 mg) in a couple ounces of water and put them into an empty fleets enema bottle and in it went. What happened surprised me. I think it does work in a similar way to an injection because that sudden influx of magnesium obviously was pushing reactions in my body that use magnesium.
First after about an hour, my intestines started rumbling, not the part where the magnesium was, but the upper intestines, and after another hour I hit bowel tolerance. Then I got a headache and my blood pressure went up, which are symptoms of excessive serotonin. I couldn't sleep and I felt hyper, which means that my catecholamines had gone up (dopamine, nor-adrenaline, adrenaline). So I looked it up to see if magnesium could increase all these nuerotransmitters, and it appears that the aromatic L-amino acid decarboxylase enzyme which converts L-dopa into dopamine and converts 5-HTP into serotonin needs magnesium. Serotonin controls intestinal motility, and that's probably an important reason why magnesium can cause bowel tolerance, at least that's why it causes bowel tolerance in me. Maybe this serotonin push is also why magnesium helps some people sleep better - it does with my husband. I have experienced these same types of symptoms from taking 5-HTP, the immediate precursor to serotonin, and L-dopa, the precursor to dopamine, so that also confirms that the magnesium was pushing this particular reaction.
Any way, I think that rectal administration of magnesium would be worth trying as a substitute for injections for people who need it. It was perfectly comfortable to take, no burning or anything. For people who need to get more magnesium into themselves, but that get the same symptoms as I do, what would probably work is to get slow release magnesium and gradually increase the dose over a period of several days to give the body time to adjust the amounts of aromatic L-amino acid decarboxylase. Our other son was getting bowel tolerance from taking about 700 mg of magnesium 3 times a day but his body adjusted and the bowel tolerance went away, so at least in his case it was possible to adjust. He didn't get the other problems, like the headache, though. If I needed to take high levels of magnesium I would prefer to get the dose up more slowly.