Full study links worth a look:
"Case histories are presented showing rapid recovery (less than 7 days) from major depression using 125–300 mg of magnesium (as glycinate and taurinate)
with each meal and at bedtime." http://www.george-eby-research.com/h...depression.pdf
This next one is really interesting (to me) because it states that magnesium modulates NMDA-receptor function. That's something that may catch your eye because low-dose Ketamine (which works so consistently to relieve depression) supposedly works the same way. And in fact the paper states that Ketamine acts "in place of" magnesium. http://george-eby-research.com/html/...depression.pdf
From there, if you're inclined to try magnesium supplementation, the difficulty is figuring out which form to buy. If you search around enough about elemental magnesium, and bioavailability, and you're human, then I think you'll wind up thoroughly confused (as I am).
Oxide is supposedly the best bang-for-your-buck despite low bioavailabilty, but then you'll read something like "Oral magnesium oxide treatment was ineffective and promoted diarrhea." That's from the second study I linked to (which, for what it's worth, mostly endorses magnesium glycinate, and recommends you stay the hell away from magnesium glutamate and magnesium aspartate).
I have to say magnesium oxide has been a lifesaver for me in tolerating any calcium, but I still freak out if I take any vitamin D or too much calcium. So I'm in the process of trying other magnesium versions (more oxide hasn't panned out).