Towards safety assessment based on human data. Imagine a world in which we perform precision safety testing of chemicals and pharmaceuticals without using laboratory animals. Imagine that the safety of chemicals and pharmaceuticals can be assessed for vulnerable groups such as infants, the elderly or the diseased. Imagine that we know how these substances interact with human biology and physiology and how they can be used safely at home, school or at work during the course of our lives. This is our vision for the future, the vision that underlies the development of the Virtual Human Platform for Safety Assessment, VHP4Safety.