They work
I didn't think "low magnesium" was a thing but my Doctor did a bunch of blood tests and I turned up low.  I did a lot of research on different forms of magnesium and supposedly, Magnesium Oxide has poor absorption in the body.  But, with two other formulations, my Mg was still low.  I finally had a prescription filled at my pharmacy and this is what they provided, and it brought my blood values up into the normal range.  So no matter whatever people say about different magnesium formulations, this one actually worked for me.
Rating: 5 stars