Clinical trial Recruiting at 1 site Observational Ages 18 and up

Observational study on women's menstrual health using an app

Official title: Apple Women's Health Study

Run by Apple Inc. · NCT04196595 · Data updated 2026-11-12

This study is trying to learn more about women's menstrual health and related conditions by having women use an app to share their experiences.

Quick facts

Study typeObservational
Ages18 Years and up
SexAll
Enrollment500000 (estimated)
SponsorApple Inc.
Industry-sponsored
Locations1 site (Boston, Massachusetts)
StatusRecruiting
StartedNovember 14, 2019
Main results expectedNovember 2029
Study endsNovember 2029
Registry record updatedJuly 3, 2024
Trial IDNCT04196595 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Ideal candidates are women aged 18 and older who have menstruated at least once and are comfortable using the Apple Research app.

Probably not a fit

Patients who do not menstruate or are not comfortable using technology may not benefit from this study.

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

This observational longitudinal study aims to enhance the understanding of menstrual cycles and gynecologic health conditions, including polycystic ovary syndrome (PCOS), infertility, and breast cancer. Participants will use the Apple Research app to enroll and contribute data regarding their menstrual health. The study focuses on gathering insights from a diverse group of women to inform future health initiatives and research. By leveraging technology, the study seeks to create a comprehensive database that can lead to better health outcomes for women.

Why it matters

Potential benefit: If successful, this study could provide valuable insights that lead to improved management and treatment options for menstrual and reproductive health issues.

How similar studies have gone: Other studies utilizing mobile health technology for women's health have shown promise, indicating that this approach could be effective.

Who can join: the full rules

Show full inclusion / exclusion criteria
Inclusion Criteria:

* Have menstruated at least once
* Be at least 18 years old (at least 19 years old in Alabama and Nebraska, at least 21 years old in Puerto Rico)
* Live in the United States of America
* Be comfortable communicating in written and spoken English
* Have installed the Apple Research app on your iPhone
* Not share your iCloud account or iPhone with anyone else
* Be willing and able to provide informed consent to participate in the study

Where it's running

  • Harvard T.H. Chan School of Public Health
    Boston, Massachusetts, United States
    Recruiting

Study contacts

Similar studies

Other studies for the same condition or treatment. Recruiting studies are listed first.

How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.