Too little Magnesium
Magnesium is an activator for many cell enzymes and is required for normal function in nerve and muscle cells. Lack of magnesium may lead to convulsions.
Solutions: Most concentrate mixtures for horses are supplemented with magnesium and will be valuable supplements to your ration.
Too much Magnesium
Moderate over feeding of magnesium will not lead to detrimental effects.
Solutions: You should nevertheless try to feed your horse according to the requirements.