Maxavita MaxaCalm 900g. Maxavita MaxaCalm is a magnesium based calmer that can help calm sharp and nervous horses, helping them help relax and concentrate without losing sparkle. MaxaCalm contains Green Lipped Mussel, a potent source of Omega 3 fatty acids that can help aid concentration and improve brain health. MaxaCalm also contains optimum levels of Magnesium and L-Tryptophan, B complex Vitamins and a blend of soothing herbs including Withania, Passiflora, Chamoile and Lemon balm. Contains no listed banned substances. Read more… 900g - 30 days supply.