Unlike many forms of Magnesium, Magnesium Citrate absorbs readily into the body and has the added benefit of hydrating the intesting tract. Horses which lack this nutrient will show signs of nervousness, wariness, muscle tremors, and excitability. Magnesium has an unbeatable reputation for having a soothing influence on the equines. A horse lacking magnesium will most likely have a poor tolerance to work, and its muscles will tighten up more than usual.