I bought this yesterday and used 1/4 tsp. this morning in water with my other supps and morning green smoothie. Can't say for sure it's the reason I feel like I want to take a nap right now (not typical for this time of day), but the more I drank that glass of water, the more I want to snooze, so I'm assuming it's the mag actually absorbing.
It's a liquid, by Trace Minerals Research, the ones that make Concentrace, I think. It's from sea water so has the other trace minerals. Called Mega-Mag. 400mg, natural ionic trace minerals. Says right on the bottle "feel the difference or your money back." I think I can feel it.
I was previously taking the Natural Calm mag. citrate that fizzes in hot water, and I don't think it was really working, particularly at nite on an empty stomach.