Expert comment from  Dr Amanda Shea , who holds a PhD in molecular biology and has contributed to ovarian cancer research and is the fractional chief science officer at period and cycle tracker app Clue . This January, a menstrual leave petition asking the government to “introduce statutory paid menstrual leave of up to three days per month for people with conditions such as endometriosis and adenomyosis” was launched.  It has since passed 100,000 signatures, and so has met the threshold for parliamentary debate.  The topic will be debated in Westminster Hall. Menstrual leave already exists in countries like Spain, Portugal, Taiwan, Zambia, and Vietnam.  But in, e.g., Spain, the law has “hardly been used”, The Guardian reports.  HuffPost UK spoke to Dr Amanda Shea, who holds a PhD in molecular biology and has contributed to ovarian cancer research, about how to make laws like these more effective.…