Magnesium is always fed as a compound. I don't know what form is regular to you but all of them are white powders. Among your choices include magnesium oxide, widely available as a feed supplement or in food grade on line. Magnesium carbonate is available from good quality equine supplement houses like Uckele. https://uckele.com/magnesium-carbonate.html MagOx is the most concentrated, so you need less. Start with a teaspoon and use just enough water to stick to your carrier. Expensive magnesium supplements marketed to horse people (MagRestore, for example) are selling you human grade magnesium at a huge mark up. MagOx is cheap, widely available and just as effective and bio-available, as far as anyone know. You feed less and save money.
Cass, Sonoma Co., CA 2012
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