Biofactors are substances required by the body for its physiological functioning. They have health-beneficial and disease-preventive biological activities. Biofactors include especially vitamins and provitamins, minerals, peptides, amino acids, fatty acids and phytochemicals. Essentiell biofactors are those the body cannot produce, or not sufficiently produce and therefore they must be supplemented. Depending on the concentration, biofactors may also have pharmacological effects.