Evidence of the effectiveness of homeopathy. Evidencia de la efectvidad de la homeopat -a. Evid ancia da efetividade da homeopatia.

The present paper discusses possible approaches to the studies on the effectiveness of Homeopathy. These include classic evidence – clinical and basic research – and internal evidence, proper to Homeopathy as a singular medical system, which include the pathogenetic and the clinical verification of homeopathic symptoms. Concerning the latter, a new approach, grounded on Bayesian statistics is presented. All the criteria employed show the clinical effectiveness of Homeopathy.