Milk chocolate is sweet chocolate that also contains milk powder or condensed milk. In the UK and Ireland, milk chocolate must contain a minimum of 20% total dry cocoa solids; in the rest of the European Union, the minimum is 25%.  "White chocolate" contains cocoa butter, sugar, and milk, but no cocoa solids. Chocolate contains alkaloids such as theobromine and phenethylamine , which have physiological effects in humans, but the presence of theobromine renders it toxic to some animals, such as dogs and cats.  Chocolate contains "brain cannabinoids" such as anandamide , N-oleoylethanolamine and N-linoleoylethanolamine.  Dark chocolate has been promoted for unproven health benefits.