|Progesterone is a steroid hormone which is essential to regulate menstrual cycle, pregnancy, and embryogenesis. During pregnancy, progesterone also helps in the development of mammary glands to stimulate milk production. It also acts as a neurosteroid to promote brain function.A journalÂ is aÂ periodical publicationÂ intended to further progress ofÂ science, usually by reporting newÂ research. Most journals are highly specialized, although some of the oldest journals publish articles, reviews, editorials, short communications, letters, andÂ scientific papersÂ across a wide range of scientific fields. Journals contain articles that peer reviewed, in an attempt to ensure that articles meet the journal's standards of quality, and scientificÂ validity. Each such journal article becomes part of the permanent scientific record.