Herbalists from the Cerrado of Brazil have organized themselves around a political and socio-environmental network, the Articulação Pacari, since 1999, from a process marked by tensions and asymmetries between interrelated claims of rights over "traditional medicine", identity, access to knowledge and "biodiversity" made by these subjects and the expansion of dynamics of ownership of knowledge and life. This research reflects on processes of (re)(de)constitution of the sharing of knowledge about medicinal plants of herbalists, at the interface with global connections. To achieve this central objective, it first discusses how the dynamics of the ownership of knowledge and life are constructed, such as the interrelations between patent, biomedicine and material property, from an interdisciplinary theoretical approach. Secondly, it analyzes the process of creation of the Articulação Pacari from its local, regional and global relations. Third, it investigates political, normative and social dynamics of identity construction of herbalists members of the Articulação Pacari from a daily life and life stories perspective. Fourth, it discusses theoretical and conceptual aspects of the interrelationships between identity, sharing and appropriation of knowledge of medicinal plants, and care. Finally, it analyzes the dynamics of the constitution of the sharing of knowledge about medicinal plants of herbalists members of the Articulação Pacari also from a daily life and life stories perspective. The research employs qualitative and interdisciplinary approach and uses primary (norms, documents, interviews, participant observation, images) and secondary sources (academic literature). It is argued that the forms of sharing of knowledge and practices around medicinal plants of herbalists have been (de)(re)constituted in a heterogeneous and strategic way, based on interrelationships of gender, class, race, ecology, faith and care. The research thus contributes to the understanding of how processes of claiming rights and ways of life of herbalists are affected by the global expansion of the ownership of knowledge and life and how these dynamics generate possibilities for epistemological and ontological reconstruction.