Holizen does not use any coloring agent or sugar in its formulas; nor do we use artificial flavour.In order to assure the quality, preservation and stability of its products, Holizen has chosen to use potassium sorbate combined with sodium benzoate in minimal quantity as preservative agent.  We can therefore avoid the proliferation of potentially harmful micro-organism.These agents are approved by the World Health Organisation and the German Federal Association BDIH.However, it is not recommended to drink directly from the bottle or to leave it exposed to great temperature change area such as in a car park in the summer sun.