How much is spent on mental health research: developing a system for categorising grant funding in the UK.

Knowing how much money is invested in funding mental health research, and in which areas, is essential to inform strategy and track trends to achieve the best allocation of limited resources. However, no comprehensive categorisation system for mental health research is available and, therefore, national and international data on mental health research funding are minimal and not comparable. In this Health Policy paper, we consider the complexities involved in generating such data and propose an approach to classify mental health research grants.