Study Shows Natural Cycles Is Comparable to the Contraceptive Pill

September 14, 2017

(Wired) – Natural Cycles, the only app to be approved as a contraceptive, has proved 99 per cent effective in the largest study investigating it to date. The startup had previously conducted a study of 4,000 women, which showed similar accuracy rates. It has now proven the efficacy of the app again after testing 22,785 women through a total of 224,563 menstrual cycles across a year, to calculate the app’s Pearl Index – the rate used to measure a contraceptive’s effectiveness. It found that if used perfectly – using protection such as condoms on red days – effectiveness is 99 per cent.