Yes; regular 400mg elemental magnesium (in chelated form)/day, and occasionally (e.g. after serious exercise) an additional teaspoon - 300-600mg elemental, in citrate form -- I find it keeps the muscles feeling much better (in a way that increasing the dose of chelated form does not -- even though the latter is supposed to be much more bioavailable).
I have never thought about the calcification angle that you mentioned in another thread, I'm just constantly experimenting since my teens, and keeping the things that seem to improve my well being (with the occasional breaks to guarantee I'm not overdosing/accumulating, and also to see that it still helps).
How much magnesium do you add to your D3?
(and, if anyone is going to try magnesium citrate or magnesium oxide as a result of this post - I highly recommend building up your dose from very little, and doing that on days where you have easy access to a bathroom - in the beginning, bioavailability is low, but it does relax your bowel muscles ... and even after your bioavailability rises, will happen with excess amounts)