- Menstrual cups are safe and result in similar, or lower, leakage than disposable pads or tampons, according to the first systematic review and meta-analysis on international use of menstrual cups, which included 43 studies and data from n=3,300 women and girls (The Lancet Public Health). https://www.thelancet.com/journals/lanpub/article/piis2468-2667(19)30111-2/fulltext 2406 comments science