The Health Integrity Project
Evidence Disproves

levonorgestrel IUD inhibit ovulation for some women in a way that reduces estradiol levels

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  • Limited Tested in Humans

    Pharmacokinetics of two low-dose levonorgestrel-releasing intrauterine systems and effects on ovulation rate and cervical function: pooled analyses of phase II and III studies

    Published 2014
    Reviewer Insight
    11/4/2025

    The study is big but the number of women who were chosen to measure estradiol was limited, but the study is robust.

    Lorena Pantano
    Read Full Paper
  • Awaiting Review

    Emergency contraception -- mechanisms of action.

    Published 2013
    Read Full Paper

Snapshot built: 2026-06-19