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Background: Against a background of declining blood donor numbers, recruiting new donors is critical for the effective operations of healthcare providers. Thus, interventions are needed to recruit new blood donors.Purpose: We provide initial evidence for Voluntary Reciprocal Altruism (VRA) to enhance nondonors' willingness to become blood donors. VRA interventions involve asking two questions: one on accepting a blood transfusion if needed and one on willingness to donate. As early trials often use self-reports of willingness to perform blood donation behavior, we derive a correction factor to better estimate actual behavior. Finally, we explore the effect of VRA interventions on two prosocial emotions: gratitude and guilt.Methods: Across three experiments (two in the UK and one in Australia: Total N = 1,208 nondonors) we manipulate VRA messages and explore how they affect both reported willingness to make a one-off or repeat blood donation and influence click through to blood donation, organ donation and volunteering registration sites (behavioral proxies). We report data from a longitudinal cohort (N = 809) that enables us to derive a correction for self-reported behavioral willingness.Results: Across the three experiments, we show that exposure to a question that asks about accepting a transfusion if needed increased willingness to donate blood with some spillover to organ donor registration. We also show that gratitude has an independent effect on donation and report a behavioral correction factor of .10.Conclusions: Asking nondonors about accepting a transfusion if needed is likely to be an effective strategy to increase new donor numbers. [ABSTRACT FROM AUTHOR]