During his «intellectualist» period, Nietzsche's philosophy was characteristic of a profound critic of the notion of knowledge.Drawing on Nietzsche's works of this period (Human, all too human; The dawn; and The gay science), the author's purpose is to explore the Nietzschean critique of knowledge to discover fallacies behind notions like scientific knowledge.Thus we discover the human all-to-human basis that sustains our production of knowledge up until our days, particularly in the social sciences.