Researchers warn that menstrual tracking apps make unsupported health claims

Harvard researchers together with Cecilia Fridén, a physiotherapy professor at Mälardalens universitet, have highlighted that femtech applications marketed for optimizing workouts or diet based on menstrual cycle phases are not backed by scientific research. While elite athletes may find value in knowing their period timing, there is no proven link between specific training types and cycle stages. The team, whose findings appear in BMJ, also warns that these apps request sensitive personal information, which could lead to privacy concerns and undue anxiety for users.

They advocate for clearer ethical guidelines and greater user education regarding data handling. Despite the lack of evidence, the apps remain popular on platforms like TikTok, where many claims are not scientifically grounded. The researchers stress the need for more rigorous studies before such recommendations are promoted.