Marjoram has long been associated with the regulation of female hormones. Anecdotal evidence suggests that it can promote breast milk production in nursing mothers, and research has recently suggested that it could act as a natural solution to irregular periods. A 2016 review shows that marjoram is able to act as an emmenagogue, which means that it may be able to prompt menstruation. But the incredible effect of marjoram on hormones doesn’t end there.