All the product of Rosel Heim nature & science consider the natural functions and the defence mechanisms of the skin. The used raw materials and agents correspond to the agents of the skin and because of that they are accepted in particular. They are more effective and compatible than agent, which are unknown to the skin. During the conservation the use of bacterial agents is avoided. Instead of that they use alternative methods (like for example stronger calefaction during the production or antibacterial fragrances) to guarantee an adequate conservation.