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Caregiving stress increases risk for poor health. The overproduction of inflammatory markers is a core process contributing to this effect. In this study the authors investigated whether formal and informal social support act as protective factors against stress-induced immune dysregulation. Fifty-six parents of children with an autism spectrum disorder completed questionnaires on formal support services, informal social support, self-rated health, and daily somatic symptoms, and they provided a blood sample for analysis of C-reactive protein ( CRP), a biomarker of inflammation. The results indicated that greater informal social support was associated with lower CRP and that a higher number of formal support services received by the family was related to better self-rated health, fewer daily somatic symptoms, and lower CRP. Moreover, the impact of support services on the parents' CRP levels increased with child age. These findings highlight the role of formal and informal support in protecting the health of individuals facing caregiving stress across the life course. [ABSTRACT FROM AUTHOR]