Magnesium Oxide- 55% elemental stock grade Magnesium
 
Priced per kilo- discounts for larger quantities.
 
Magnesium Information:
The most common form of Magnesium available is Magnesium Sulfate, commonly called Epsom salts, however one side effect of regular feeding of Epsom salts is diarrhea. The usual form used in animal feeds is Magnesium Oxide, a fine white powder. Magnesium Oxide is about 50-55% absorbable, depending on the relative levels of Calcium also present. The advantage of magnesium oxide is that the body will not absorb it if there is no deficiency, so it is difficult to overdose a horse using this source.