This human grade powder can be dissolved in water and administered orally. A typical guideline is 25-100 grams for cows and horses per 100kg in body weight. Sheep's and goats are 10-40 grams per 40kg in body weight.
Commonly used in baths for its high purity and commonly used as an exfoliating tool.
Magnesium sulfate (Epsom salt) is also highly available to the horse for absorption, but it also has an effect of drawing water into the bowel and causing diarrhea, so it is not recommended for daily use. Magnesium helps protect against inflammation and free-radical damage.