Horses less than 499 lbs. body weight - 1/2 scoop daily.
500-899 lbs. - 1 scoop daily.
900-1,099 lbs. - 1-2 scoops daily.
1,100+ lbs. - 2-3 scoops daily.
Amount and frequency may be varied as necessary. Magnesium can be lost in sweat. For animals that sweat a lot, quantity could be increased 1-1/2 - 2 times recommended feeding amount. Feeding 4 or more times recommended amount may create a laxative effect.