RobinN
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It says elemental magnesium and elemental calcium. Does that say anything to you?
EDIT: okay, I thought after posting this that of course they're elemental, since they're elements! So I looked the ingredients up online, they are:
Elemental magnesium (gluconate and citrate) ... 186 mg
Elemental calcium (gluconate and lactate) ... 155 mg
Elemental zinc (citrate) ... 3.5 mg
Vitamin D3 (cholecalciferol) ... 204 I.U.
That isn't a very large amount of magnesium, however:
Magnesium citrate is a chemical agent used medicinally as a saline laxative
http://www.mothernature.com/Library/Bookshelf/Books/10/7.cfmMagnesium gluconate is absorbed more quickly than other forms. And you don't have to take quite as much, since the amount of magnesium per capsule that your body can use is higher.
A bit odd to me that they would include one that is a laxative and the other that is more absorbable.
As a general rule, you need about six milligrams of magnesium for every kilogram (2.2 pounds) of body weight. That means that if you weigh 150 pounds, you should be getting about 400 milligrams a day. If you develop diarrhea, simply take your magnesium in divided doses throughout the day, or reduce the dose by 20 to 25 percent until normal soft bowel movements return, says Dr. Mansmann.
For calcium absorption you might include Vitamin D.
However, this is one reason that I like to take a supplement that is not combined with another. It is easier to eliminate one and see if there is a positive difference.