Frequent social contact has been associated with better health and longer life. It remains unclear though whether there is an optimal contact frequency, beyond which contact is no longer positively associated with health and longevity. The present research explored this question by examining nonlinear associations of social contact frequency with health and longevity. Study 1 (N ∼ 350,000) demonstrated that once the frequency of social contact reached a moderate level (monthly or weekly), its positive association with health flattened out. Study 2 (N ∼ 50,000) extended these findings to longitudinal and mortality data: Although low contact frequency was associated with poor health and low survival rates, increasing the frequency of social interactions beyond a moderate level (monthly or weekly) was no longer associated with better health and longevity and, in some cases, was even related to worse health and increased mortality risks.