supplements to alleviate leg cramping

i'm 20 weeks.  my chief complaint is leg cramping.   yes, i eat a banana a day in my smoothie.  i drink a lot of water, but it seems to not be helping.  still, i'm awoken several times in the night with HORRIBLE pains similar to my DVT, and i went to sprout's to see if there was any potassium supplement that i could take to help my situation.

the lady told me that actually it was a lack of magnesium which was probably the root of my leg cramping. who would have thought?!  i didn't even know where you find magnesium... meaning, in what food?  well, in LOTS of food!!!  it's in nuts, seeds, whole grains, veggies, beans, etc... AND, she also told me that the root of a lot of diseases, scientists have found, were traced back to a lack of magnesium.... apparently, magnesium is needed by some 300 parts in your body... wowsers!!!  amongst many things, it helps out asthma, blood clotting, leg cramping, allergies, muscle weakness, ADHD (i have most of that right now, especially ADHD my whole life)!!!  here's more information.  AMAZING!!!  i even read that a magnesium deficiency can lead to death due to heart failure!!!

anyway, through more reading, i found that a lack of calcium and potassium also can inflict leg cramping.  not to mention dehydration.  i did pick up a potassium/magnesium supplement.  over the counter, the max amount that they can sell of potassium is 99mg, so my supplement has that in it and 300mg of magnesium.

at my next ultrasound, i will double check with my dr. if it's allright that i'm now taking this supplement. :)

here's Baby Center's information/tips about leg cramping.