quackery
From Longman Dictionary of Contemporary Englishquackeryquack‧er‧y /ˈkwækəri/ noun [uncountable] MAthe activities of someone who pretends be a doctorExamples from the Corpusquackery• Most medical practices were based on a fearful quackery, and most of the doctors were butchers or cranks.• Neither the accepted medical help, nor the quackery were of much use, for poor Louisa died early the following morning.