Well here is perhaps another thing controlled by mag deficiency.
Remember the studies on enteric coated PC in colitis.
Well endogenous production is controlled by guess what,mag.
Old Mike
As you can see here we are low with PC in our mucus.
/www.ncbi.nlm.nih.gov/pubmed/15513358it this stuff that is controlled by mag which makes the PC
/en.wikipedia.org/wiki/Lecithin%E2%80%93cholesterol_acyltransferaseand if deficient in mag at least in the rat.
/www.researchgate.net/publication/16450729_Reduction_of_plasma_lecithin_Cholesterol_acyltransferase_activity_by_acute_magnesium_deficiency_in_the_rat