I'm always a little wary of making 'claims' about supplements, for a whole host of reasons. Dosing, and efficacy, and time to take effect, and so on. We all vary so much.
But from what I have observed, from my own supplement intake:
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for me, magnesium seems to help with muscle weakness and heavy limbs, but not really with cramping - but other people find it does help with cramps
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for me, potassium rapidly helps with cramping. I find it works within a couple of hours, and so long as I remember to take the tablets, does not reoccur
The reason I know that
for me potassium has more effect on cramps than magnesium, is that I used potassium for years and it eliminated my cramps for years (I have been low carbing for a loooooong time
). Then I arrived on this forum, and ppl kept recommending magnesium - so I tried it - and I found that it helped with trembly legs and heavy limbs.
Hope that makes sense.