This article is dedicated to analysing the national legal protection afforded to consumers in the face of advertising. The relevance of the subject is due to the situation of extreme vulnerability to which consumers are exposed by the practice of illicit advertising, which can lead them into error, illusion, and undermine their morale and/or physical integrity. It is therefore imperative to understand the protection that the Consumer Defence Code, together with other legislation, imposes on consumers, essentially with regard to advertising. In addition, he notes that the consumer is the target of too much concern from legislators, given that it has gained the quality of a fundamental clause in the Norma Maior. It elucidates the legal consumer relationship, defining the subjects involved, as well as qualifying products and services. It conceptualises advertising in such a way as to crystallise the aspects that differentiate and link it to offers and propaganda; it mentions the constitutional bases involved and examines its types, principles, broadcasting techniques and forms of control. Finally, it defines misleading and abusive advertising, emphasises its characteristics and points out the consequences for its practitioners.