Non-maleficence is a practice in which physicians must refrain from providing ineffective treatments or acting with ill will toward patients. But since many beneficial therapies have serious risks, therefore, this principle, offers a little useful guidance to physicians. Scientific journal is a periodical publication intended to further progress of science, usually by reporting novel research. There are thousands of scientific journals in publication, and many more have been published at various points in the past. Most journals are highly specialized, although some of the oldest journals publish articles and scientific papers across a wide range of scientific fields. Scientific journals contain articles that are peer reviewed, to ensure that articles meet the journal's standards of quality, and scientific validity.