Scaling of effective innovations in health and social care is essential to increase their impact. The authors aimed to synthesize the evidence base on scaling and identify current knowledge gaps.

The authors conducted an umbrella review according to the Joanna Briggs Institute Reviewers' Manual. They included any type of review that 1) focused on scaling, 2) covered health or social care, and 3) presented a methods section. Paired reviewers independently selected and extracted eligible reviews and assessed study quality. A narrative synthesis was performed.

The study highlights knowledge gaps around methodology and research infrastructures to facilitate equitable North-South research relationships. Common efforts are needed to ensure scaling expands the impacts of health and social innovations to broader populations.