We surveyed 60 undergraduates who were enrolled in a capstone course at a large research university on the west coast to explore the impacts of required internships on college student mental health. Levels of flourishing, positive emotions, negative emotions, and overall affect balance were measured in relation to each student's internship experience. The results indicate that the number of units participants were enrolled in is positively associated with the frequency of flourishing and positive emotions. The number of days interning per week is also positively associated with the frequency of negative emotions. Implications and suggestions for future research are discussed.