The chapter studies the impact that human rights due diligence (HRDD) has on voluntary sustainability standards (VSS). This chapter illustrates isomorphic pressures among VSS that stem both from HRDD and benchmarking initiatives enrolling HRDD to advance social and environmental objectives. Private schemes extend key requirements to non-certified volumes and firms to account for human rights responsibilities of entities at different levels of the value chain. This allows schemes to better fit in firms’ HRDD systems as they cover risks for more value chain entities. VSS themselves enact enhanced due diligence accounting for their own HRDD responsibilities vis-à-vis impact generated by members and certified firms. By strengthening efforts in the provision of collaborative tools between firms at different levels in the value chain, VSS’ function is partially re-aligning, testifying to their resilience at a juncture in which they face criticism and competitive pressures from other private tools. VSS also exercise non-regulatory activities such as offering fora for engagement, remediation and sharing costs of social and environmental compliance.