Oh yea, huge difference. Taking a chelated version is much easier on your digestive track, especially if you are just starting. I take 500 mg of magnesium citrate every day. I learned about the benefits of magnesium in Michael Eades Protein Power Life Plan book.
Health wise, it is critical for heart and nerve tissue health, healthy blood sugar metabolism, muscle contraction, and vital to a host of enzyme functions. I take it to stay regular - it works!
For people who ingest lots of caffeine or take diuretics, magnesium deficiencies are common. Starting a low carb diet will cause a loss too, because of all the water your body releases when it stops having to dilute all that sugar..
Magnesium will help if you get charley horses in your leg muscles. My sweetie used to get horrible leg cramps in the middle of the night.. I kept telling him he needed magnesium.. FINALLY, he listened, took some, and the cramps went away.
Be careful to buy magnesium citrate, as it the most absorbable form.
FYI Food sources include: Pumpkin seeds, almonds, black eyed peas, cashews, kidney and lima beans, brazil nuts, pecans, tomato paste, halibut, artichokes, whole grains, blackstrap molasses, raw leafy vegetables, peanut butter, bananas, avocados.