Sources of Strength is a best practice, strength-based, upstream suicide prevention and mental health promotion program that has shown effectiveness in both preventative upstream and intervention outcomes. Sources provides high-quality exceptional training for both youth and adults in secondary schools and community-based settings, and has moved even further upstream with an elementary model featuring a fully stratified K-5 curriculum, which is informed by the research below while establishing a unique evidence base. The Sources of Strength Secondary Program has been involved in several large randomized control trials and is one of the most rigorously evaluated and broadly disseminated prevention programs in North America. The Sources of Strength Secondary Program is considered the first suicide prevention program to demonstrate effectiveness in using peer leaders to enhance protective factors associated with reducing suicide across a school population. A study published by the American Journal of Preventive Medicine in 2025 found that the Sources of Strength Secondary Program intervention reduced the overall odds of a new suicide attempt by 29%. This impactful finding, along with the research published in 2023 in Injury Prevention, found Sources of Strength to be the first universal intervention to show a statistically significant reduction in youth suicide mortality through a randomized control trial, shows that the Sources of Strength secondary program reduces suicide mortality and suicide attempts. Sources of Strength teams are active across the United States, Canada, the Mariana Islands, and many American and Alaska Native and First Nations communities.