Following a request from the European Commission, the Panel on Dietetic Products, Nutrition and Allergies was asked to provide a scientific opinion on a list of health claims pursuant to Article 13 of Regulation (EC) No 1924/2006. This opinion addresses the scientific substantiation of health claims in relation to caffeine and theobromine in cocoa (Theobroma cacao L.) and enhancement of mood. The scientific substantiation is based on the information provided by the Member States in the consolidated list of Article 13 health claims and references that EFSA has received from Member States or directly from stakeholders. The food that is the subject of the health claim is cocoa (Theobroma cacao L.). The Panel considers that whereas the food, cocoa (Theobroma cacao L.), is not sufficiently characterised in relation to the claimed effect evaluated in this opinion, the food constituents, caffeine and theobromine in cocoa (Theobroma cacao L.), are sufficiently characterised. The claimed effect is “maintenance of a normal mental health (well-being feeling, relaxation)”. The target population is assumed to be the general population. In the context of the proposed wordings, the Panel assumes that the claimed effect refers to enhancement of mood. The Panel considers that enhancement of mood might be a beneficial physiological effect. No references were provided from which conclusions could be drawn for the scientific substantiation of the claim. On the basis of the data presented, the Panel concludes that a cause and effect relationship has not been established between the consumption of caffeine and theobromine in cocoa (Theobroma cacao L.) and enhancement of mood.