The aim of this review was to describe research related to support interventions for adult family members of people with mental illness and the significance that support may have. The results indicate the importance of flexible and individualized forms of support from both professionals and people with personal experience as a family member of someone with mental illness. In many cases, the intervention studies revealed that family members' burden decreased, their knowledge of the disease and treatment increased, and their ability to cope with the situation was improved. The results highlight the importance of support both from professionals and peers.