Biosocial interactions is a research concept and field investigating the dynamic and reciprocal interplay between biological elements (e.g., genetics, physiology, neurobiology) and social environments (e.g., culture, relationships, socioeconomic status). This approach examines how these factors mutually shape human development, behavior, health trajectories, and disease etiology, emphasizing integrated, non-reductive understandings of complex phenomena across the lifespan.