I haven't seen this mentioned before on the forum but I have been taking a magnesium glycinate supplement made by Kirkman. They call it Buffered Magnesium Glycinate Sweet Powder. It is specifically made for children, hence the sweetness for palatability.
It is Albion Mag. Glycinate sweetened with a small amount of sucralose and buffered with citric and adipic acid. Disslove it in water or fruit juice and it is easy to take. Each 1/2 teaspoon supplies 997 mg of mag. glycinatewhich is equivalent to 182 mg. of elemental magnesium. This is all it contains, none of the bad stuff.
It costs about $12 per tub and can be ordered from their website on line. It seems to work well for me and I would think that the absorbability should be very good.
Has anyone else been using this and is there anything to be concerned about?