Every horse needs mineral and trace element supplementation in addition to other feeding. Minerals, minerals and trace elements are important building materials for the horse's bones and connective tissues. They also participate in many chemical reactions in the body. The balance of minerals is important for the horse, because minerals and trace elements work together in the body. Excess intake or deficiency of one mineral makes it difficult to utilize or absorb another mineral. The most important minerals in the horse are calcium, phosphorus, magnesium, sodium, chlorine and potassium. Particular attention should be paid to the ratio of calcium and phosphorus. The need for mineral intake varies from horse to horse, depending on e.g. their age, race, size, purpose of use and the severity of the work.