Health Telematics services are now a major part of health care delivery, and of citizens' health behaviour, and will rapidly develop further in scope and significance. However, despite their pivotal position in care and treatment, they are unregulated--unlike all other aspects of health care services. This anomaly is potentially putting the citizen at risk, and also underpinning good clinical practice as clinicians are uncertain of the integrity of specific health telematics tools. The TEAC-Health project, funded by the European Commission, has studied the issues, and produced evidence-based recommendations.