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Current research suggests that the progestin hormone in birth control pills affects proteins produced by the liver. We want to understand why this happens. To study this question, we will ask women to take a dietary supplement along with their regular birth control pill. We hope that our research will help us prescribe the best birth control pills for patients.


You may be eligible to participate in this study if:

  • You are between the ages of 18 and 44
  • You have regular menstrual cycles
  • You use Yaz, Gianvi, Loryna, Nikki, or Vestura birth control pills

Qualified participants will be compensated up to $150 for time and travel. Study participation involves 2 visits to the Women's Health Research Unit on the Marquam Hill Campus of OHSU.

Who do I contact for additional information?

To find out more information and to learn if you are qualified to participate, complete the online form, call the Women's Health Research Unit's confidential recruitment line at 503-494-3666 or email us at