Effects of St. John's Wort on the Oral Contraceptive Hormone Levonorgestrel
Public ClinicalTrials.gov record NCT00131885. Field values are reproduced from the official study page; the official ClinicalTrials.gov record remains the source of truth for eligibility, enrollment, and contact information.
Data is sourced from official ClinicalTrials.gov public API records. Always review the official ClinicalTrials.gov record for the latest information.
Official title
Effects of St. John's Wort on Levonorgestrel
Study identification
- NCT ID
- NCT00131885
- Recruitment status
- Completed
- Study type
- Interventional
- Phase
- Phase 4
- Lead sponsor
- University of Utah
- Other
- Enrollment
- 36 participants
Conditions and interventions
Conditions
Interventions
- Placebo Control (Placebo Herb) Dietary Supplement
- St. John's Wort Dietary Supplement
- Levonorgestrel Drug
Dietary Supplement · Drug
Eligibility (public fields only)
- Age range
- 18 Years to 30 Years
- Sex
- Female
- Healthy volunteers
- Accepts healthy volunteers
This page does not interpret eligibility. Detailed inclusion and exclusion criteria are on the official ClinicalTrials.gov record.
Study timeline
- Start date
- Jul 31, 2005
- Primary completion
- Apr 30, 2008
- Completion
- Apr 30, 2008
- Last update posted
- Nov 12, 2023
2005 – 2008
United States locations
- U.S. sites
- 1
- U.S. states
- 1
- U.S. cities
- 1
| Facility | City | State | ZIP | Site status |
|---|---|---|---|---|
| University of Utah | Salt Lake City | Utah | 84112 | — |
Site contact phone numbers, emails, and investigator names are intentionally not displayed here. Open the official ClinicalTrials.gov record for site contact information.
About this trial record page
- What this page shows
- Public field values for ClinicalTrials.gov record NCT00131885, including study identification, conditions, interventions, eligibility (age, sex, healthy volunteer), timeline, and U.S. site list.
- What this page does not do
- No medical advice, eligibility judgments, treatment recommendations, study quality scoring, or AI-generated medical summaries. No site contact phone numbers, emails, or investigator names.
- Where the data comes from
- Sourced from the official ClinicalTrials.gov public API. The official record is the source of truth.
- Last refresh
- Last update posted Nov 12, 2023 · Synced Jul 23, 2026
Related: full search, browse by condition, browse by drug or therapy, browse by sponsor, browse by U.S. city.
Open the official record
The complete protocol, eligibility criteria, and contact information for NCT00131885 live on ClinicalTrials.gov.