[narag]

Regarding the magnesium: I did not know that. How do you make sure the brand and/or it's magnesium is of good quality?

The ultimate quality is impossible for me to judge. I just believe them at face value. The problem is that there are different kind of Mg (citrate, carbonate, oxyde) and different ways to write the quantities in the label. It's been a long time since I read it.

One common trick is saying that there is one gram per serving. But in the fine print they say that a serving is not one pill, but two pills. Or three or four.

Another trick was playing with total vs. elemental Mg weight.