Source Naturals are what I take. They are a large pill. I'm not sure if you'll be able to find it in a cap. If you have a health food/ vitamin shop close by you could always go look.
It may not be much different as far as making you go.
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The Malate part of Magnesium Malate is Malic acid , it's a natural fruit acid that is present in most cells in the body and is an important component of numerous enzymes key to ATP synthesis and energy production. If you search malic acid you'll find plenty of info and reasons why it's good for FM.
I've been thinking of taking a dose of Malic acid aside from the Mag Mal.
I take the Malic Acid as magnesium malate and it doesn't cause the potty problem. I order mine from puritans pride. They have quit a selection of things and sometimes have some good sales. Mine is a big tablet though, they may have capsules.