VR/AR offers unique capabilities for health related research and treatment, not only because it allows interactive, multisensory, immersive environments tailored to a patient's needs, but also because it allows clinicians to control, document, and measure patient responses. A notable example is 'Bravemind', a VR exposure therapy tool used to assess and treat PTSD. VR/AR can be combined with virtual human technology to create powerful experiences. Virtual humans, autonomous agents who interact with real humans both verbally and non-verbally, can benefit the medical field in numerous areas, including training and education. In this session, examples will be discussed in terms of their design, development and effectiveness.