The demand for more and varied plant protein sources is growing. The supply of underutilized plant protein sources is also growing. How can membrane processing help bring these proteins to market? What challenges arise when attempting to do so? We will attempt to answer these two questions by focusing on two case studies, one involving native proteins and the other involving hydrolyzed proteins. We will also focus on what comes next, what challenges await in scaling, and what will accelerate the development of these processes and plant protein products, from one researcher’s perspective.