1Day Sooner is a nonprofit that advocates for people who participate and want to participate in high-impact medical studies, particularly human challenge trials, where healthy volunteers are infected with a disease to test a vaccine, treatment, or to learn other important information. 

In line with the altruism of healthy volunteers, they more broadly work towards a world that prioritizes efficient development of life-saving medical research, distributed equitably so as to minimize the global suffering caused by infectious disease.

They organize volunteers who are in studies and people who want to be in studies; they engage in advocacy with regulators, lawmakers, and other stakeholders globally; they support and conduct research on vaccines policy, biosecurity, public health, and research ethics; and they assist in communications and outreach to elevate the voices of healthy volunteers in public discourse.