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 type | Observational |
|---|---|
| Ages | 18 Years and up |
| Sex | All |
| Enrollment | 500000 (estimated) |
| Sponsor | Apple Inc. Industry-sponsored |
| Locations | 1 site (Boston, Massachusetts) |
| Status | Recruiting |
| Started | November 14, 2019 |
| Main results expected | November 2029 |
| Study ends | November 2029 |
| Registry record updated | July 3, 2024 |
| Trial ID | NCT04196595 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
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Harvard T.H. Chan School of Public Health
Boston, Massachusetts, United States Recruiting
Study contacts
- Principal investigator: Michelle A Williams, SM, ScD — Harvard School of Public Health (HSPH)
- Study coordinator: Shruthi Mahalingaiah, MD
- Email: AppleWomensHealthStudy@hsph.harvard.edu
- Phone: 617-432-1356
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How to take part
- Review the eligibility criteria above with your treating physician.
- Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
- Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.