My research explores the emergence of a new socio-medical system centered on the regulation of reproductive hormones and their shaping of contemporary Japanese understandings of body and gender. Building on two years of ethnographic research in Tokyo, my research centers on the hormonal birth control pill, which was only approved in Japan in 1999. I argue that in a post-bubble Japanese state suffering from low fertility and flagging GDP, the Pill now offers women the means to control and modify themselves on a molecular level. Defined as a therapeutic regulator that keeps women’s reproductive systems healthy while enhancing their competitive edge, the Pill, I argue, synchronizes women’s material bodies with new social expectations that they not only raise children, but also work, in order to make up the difference in household income when the lifelong salaried jobs which men traditionally held have disappeared. Women believe that while they work towards career success, they can use the Pill to preserve their ovaries until they are ready to start a family, suggesting that the Pill’s twenty-first century uses serves the Japanese state’s interests in optimizing population through the extension of women’s productive and reproductive labor. My research traverses the Anthropology of Medicine, Science and Technology Studies and East Asian Studies to shift scholarly narratives that situate the Pill’s development in relation to postwar efforts to control population. Bringing to the forefront the changing economic conditions that underwrite the Pill’s adoption, my research suggests that if the pill enabled women to work outside the home, it did so when income stagnation in the Global North made their participation in the workforce necessary.