everybody is different.
i take slow mag daily, it helps with muscle twitches when I'm trying to sleep, but before that I took Repleni Mag.
First time I took it I spent the entire night up and down to the toilet emptying the bladder. I tried it again 6 months later and it worked fine, then about 1 month after that it started to irritate the bowels.
So far slo mag has been constant.
Everybody's body is different.
for me, the times I've cramped have always been when I've done efforts the body is not used to, the fitter I've gotten the easier its become to back off and spin through the spasm.
But I seem to recall an article/YT vid a few months back where it was said that doctors have not been able to pin point the exact cause of why people cramp and others dont.