The main aim of the COST Action is to make a step-change towards a green economy based on Ulva mass production and utilization within the European community and beyond. The ultimate goal is the development of Ulva-based blue-biotech industries and utilization of Ulva as a model organism in European algaculture. The Ulva COST Action will facilitate acquainting the traditional European diet and taste with Ulva, as a new, sustainable, and safe food item. The Action will profit from the world-renowned quality standard of European food production and from the nutritional value of Ulva toward using this alga in European human diet and animal nutrition.