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We examined the links of supportive and conflictual peer interactions to mood and self-care via ecological momentary assessment. Adolescents with Type 1 diabetes (n= 167, 49% female) recruited between 2018 and 2021 were prompted 8 times a day for 8 days to complete brief surveys that measured perceived social interactions, affect, and self-care. Cross-sectional analyses revealed between-and within-person (WP) links of peer support to positive mood and conflict to negative mood. Between-person peer support was linked to healthy self-care, but WP support was not. Lagged analyses showed conflictual interactions were associated with self-care decline. There was some evidence that females did not benefit as much from support and were more bothered by conflict than others. Results underscore differences in between-and WP links of social interactions to health …