Oxytocin varies across the life course in a sex-specific way in a human subsistence population

Proceedings of the National Academy of Sciences, Volume 122, Issue 51, December 2025. SignificanceThe hormone oxytocin is linked to reproduction, social bonding, and health. To date, no single study has investigated oxytocin in both sexes across the life course. Working with the Tsimane of lowland Bolivia—a subsistence population with high …