Thanks, Jack. Sal, I found an interesting little explanation of magnesium's role in the body, here is a short excerpt that I found very intriguing:

"The symptoms of magnesium deficiency are irritability, tantrums, seizures, insomnia, muscle cramps/twitching, hyperactivity and poor digestion among others. Magnesium is needed for proper electrolyte function, over 300 enzyme functions, and calcium absorbtion.

I also found it very interested to read that one of the primary sources of dietary magnesium is whole grains and cereals. If one goes 100% gluten free, you may be losing a main source of magnesium, and could go deficient especially if you are also supplementing with extra calcium to make up for the casein free part.

Higher amount of magnesium may cause a laxative effect (milk of magnesium, epsom salts)."

The whole article can be read here: http://www.enzymestuff.com/magnesium.htm