Magnesium threonate or glycinate ?

I was shocked to find some many different forms existed and according to the Applied School of Functional Medicine all with very different intended applications. I researched it thoroughly before trying M. Glycinate not that it did me any good. I still couldn’t tolerate it but there. You can
but try.
https://schoolafm.com/ws_clinical_know/client-relief-magnesium-to-the-rescue/

Has anyone actually felt worse when starting Magnesium?