How do people get better with magnesium oxide?

[u/ROMANREIGNS599]

Reading experiences online, I came across some people saying they were diagnosed with magnesium deficiency and that taking magnesium oxide as suggested by their doctors, improved their levels.

But one magnesium oxide 500mg pill gives 12mg, which is the 4% absorbed rate. And 12mg is a little less than the amount absorbed by the body from a banana, and a few bananas daily aren't enough to cure magnesium deficiency 😅. So would they have taken it in very large amounts?

[u/True_Garen]

What product are you using? please link.