Low-Dose pill vs. Progestin-Only: which stops ovulation best?
NCT ID NCT03106454
First seen Jun 27, 2026 · Last updated Jun 27, 2026
Summary
This study looked at whether a very low-dose combination birth control pill (10 mcg estrogen) prevents ovulation better than a progestin-only pill with a similar amount of progestin. Fifty-eight women took one of the two pills for a few months. Researchers checked ovulation using blood tests and also looked at cervical mucus quality. The goal was to see which pill works better and has fewer side effects.
What this could mean
Our plain-language read of the trial. This is informational only — not medical advice or a prediction.
- Active substance
- Ethinyl estradiol and norethindrone acetate combination pill (Loestrin) vs. norethindrone-only pill (Micronor)
- What this could lead to
- If successful, this could help doctors choose the best birth control pill for each woman, balancing effectiveness and side effects.
- What could go wrong
- This is a small, completed study with only 58 participants, so results may not apply to all women. It does not test long-term safety or real-world use.
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As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
Contacts and locations
Locations
-
Brian T. Nguyen
Los Angeles, California, 90065, United States
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