Iron raw material provides a privileged source of information for the reconstruction of metallurgical techniques and the circulation of iron products. An interdisciplinary approach, combining archaeological and archaeometrical studies of the exemplars known from the French Iron Age, has been undertaken. This enables to precise the quality of materials, the level of artisan specialization and the circulation of products. The aim is also to restitute the economical and political context of exchange of these products little transformed, as their condition of production and diffusion could have been possibly submitted to specific control.