As all horses are different we cannot guarantee the success of MaxaCalm. However, we have had many good results from event riders, dressage riders and happy hackers who use the MaxaCalm for a variety of reasons. MaxaCalm is Magnesium based and contains L-Tryptophan and a blend of calming herbs. The addition of Green Lipped Mussel makes it different from other equine calmers on the market. Green Lipped Mussel is high in Omega 3 fatty acids, which are important for brain health and have been found to improve concentration levels in humans.