National Institute of Environmental Health Sciences   —  National Institutes of Health   —  U.S. Department of Health and Human Services

The Sister Study

Making a difference for future generations of women

Contact Us


Call toll-free 877-4SISTER

For deaf or hard of hearing, call:

Hours of Operation

Monday - Friday: 9 am to 10 pm EST
Saturday: 9 am to 4 pm EST
Sunday: By appointment only


Please use this form to send your question or comments to the Sister Study. Or if you like, e-mail  us at; however, be mindful that we cannot protect your personal information sent through email. 

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