Last reviewed: May 12, 2026 Last updated: May 12, 2026

Written by: Jay Hastings , CEO of PlexusDx

Jay Hastings is the CEO of PlexusDx, a precision health company focused on genetic testing, blood biomarker insights, and personalized wellness recommendations. He has more than 20 years of experience across healthcare innovation, genomics, laboratory operations, healthcare investing, and strategic finance. His work has included scaling healthcare startups, leading CLIA lab integrations, and helping expand consumer access to precision health tools.

Medically reviewed by: Jayden Lee, PharmD, EMBA

Jayden Lee, PharmD, EMBA, is the PlexusDx Medical Science Liaison with a PharmD and MBA specializing in pharmacogenomics and clinical product development, with a proven ability to bridge the gap between genomic research and practical patient outcomes. Dr. Lee has more than 10 years of professional experience in clinical pharmacy, academia, and research.

How CYP2C19 Affects Progesterone Metabolism and What It Means for You

Progesterone is a hormone that helps regulate mood, libido, sleep, and fertility in men. The CYP2C19 gene makes an enzyme in the liver that helps break down progesterone, particularly when it is taken as a supplement or as part of hormone therapy. Variations in CYP2C19 can change how quickly your body clears supplemental progesterone. Slower metabolism may lead to higher circulating progesterone levels and a greater chance of side effects or hormone imbalance. This article explains the likely effects of each rs4244285 genotype and offers practical diet, supplement, lifestyle, and monitoring suggestions to support healthy hormone balance.

Key concepts

  • Genetic variants in CYP2C19 change the speed at which supplemental or therapeutic progesterone is metabolized.
  • Slower metabolism can increase progesterone exposure and the risk of hormone-related side effects affecting mood, libido, sleep, and fertility.
  • Diet, targeted supplements, and lifestyle habits can support liver detoxification pathways and hormone balance.
  • If you take medications processed by CYP2C19 or are using progesterone therapy, discuss dosing and monitoring with your healthcare provider.

Personalized Genetic Interpretations

Two effect alleles (AA) — Poor metabolizer

If your genotype is AA for rs4244285 you carry two copies of the effect allele and are classified as a poor metabolizer. Your CYP2C19 enzyme works very slowly, so supplemental or therapeutic progesterone is broken down much more slowly than average. This can lead to higher systemic progesterone levels and increase the risk for hormone imbalances that may affect mood, sexual function, sleep, and fertility.

Clinical implications

  • Higher risk of progesterone accumulation when taking oral or vaginal progesterone supplements or hormone therapy.
  • Increased possibility of side effects from medications processed by CYP2C19 due to slower clearance. Dose adjustments or alternative drugs may be needed.
  • Regular hormone and medication level monitoring is recommended when on therapy.

Practical steps

  • Share this genetic result with prescribing clinicians so they can consider dose changes or monitoring plans.
  • Emphasize liver-supportive nutrition and lifestyle habits listed below.
  • Avoid grapefruit and bergamot products which can further lower CYP2C19 activity.
One effect allele (AG) — Intermediate metabolizer

If your genotype is AG for rs4244285 you carry one copy of the effect allele and typically have slower than normal metabolism of supplemental progesterone and certain medications handled by CYP2C19. This slower breakdown can increase circulating progesterone when you use supplemental forms, potentially affecting mood, sleep, libido, and fertility.

Clinical implications

  • Intermediate risk of progesterone accumulation with hormone therapy or supplements.
  • Some medications processed by CYP2C19 may require dose review or monitoring.

Practical steps

  • Discuss potential dose adjustments and monitoring with your healthcare provider if you use progesterone therapy or CYP2C19-metabolized drugs.
  • Support liver detox pathways using the diet and lifestyle strategies below.
  • Avoid grapefruit and bergamot products to prevent further slowing of metabolism.
No effect alleles (GG) — Normal metabolizer

If your genotype is GG for rs4244285 you carry two copies of the non-effect allele and typically have normal CYP2C19 enzyme function. Your body clears supplemental or therapeutic progesterone at an expected rate. You are likely at standard population risk for hormone accumulation due to this gene.

Clinical implications

  • Standard metabolism of progesterone and CYP2C19-processed medications.
  • Routine monitoring only as indicated by symptoms or by prescribers of hormone therapy.

Practical steps

  • Maintain general liver and hormone health habits described below.
  • Notify clinicians about medication lists and supplements you use so they can consider interactions.

Dietary and Supplement Strategies to Support Progesterone Clearance

These suggestions aim to support liver detoxification pathways and help maintain healthy hormone balance. They are most relevant if you take supplemental progesterone or drugs processed by CYP2C19.

  • Increase cruciferous vegetables: Broccoli, kale, Brussels sprouts, cauliflower, and cabbage support Phase II detox pathways and can help hormone metabolism. Aim for several servings per week.
  • Eat polyphenol-rich foods: Berries, green tea, dark chocolate in moderation, and colorful fruits and vegetables provide antioxidants that support liver health.
  • Consider these supplements after discussing with your clinician:
    • Sulforaphane (from broccoli sprout extracts) to support Phase II detox enzymes.
    • N-acetylcysteine (NAC) to boost glutathione, a central antioxidant in the liver.
    • Resveratrol for antioxidant and metabolic support, used cautiously with medications.
    • Calcium D-glucarate to support elimination of steroid hormones and their metabolites.
  • Avoid grapefruit and bergamot products: These can further inhibit CYP2C19 activity and raise levels of progesterone and certain medications.
  • Limit alcohol and high intake of processed foods, which can burden liver function.

Lifestyle, Environmental, and Monitoring Recommendations

  • Sleep: Aim for consistent, restorative sleep. Poor sleep can disrupt hormone regulation.
  • Exercise: Regular moderate exercise supports hormone balance and liver health. Avoid extreme training if experiencing hormonal symptoms without clinician oversight.
  • Stress management: Chronic stress alters hormone pathways. Use relaxation techniques, mindfulness, or counseling as needed.
  • Reduce exposure to endocrine disruptors: Minimize contact with BPA, phthalates, and certain pesticides by choosing fresh foods and safer personal care products.
  • Medication review: If you take drugs that list CYP2C19 metabolism, inform your prescriber of your genotype. Dose adjustments or alternative therapies may be appropriate.
  • Monitoring: If you are on progesterone therapy or take CYP2C19-metabolized medications, periodic checks of hormone levels and therapeutic drug monitoring can help prevent side effects and guide dosing.

Cautions and Next Steps

Supplements and lifestyle changes can support liver and hormone function but may interact with medications or underlying health conditions. Before starting any new supplement or making significant changes to medication dosing, consult with your healthcare provider. Bring this report to your clinician to support shared decision making about hormone therapy, medication choices, and monitoring plans.

Important disclaimer

PlexusDx does not provide medical advice. This information is educational and meant to explain how genetic variation in CYP2C19 may influence progesterone metabolism and related health considerations. Always consult your healthcare provider before changing medications, starting supplements, or making major lifestyle changes.

If this genetic variant is present in your PlexusDx results, the following tests and reports are commonly used to explore it further:

🧬 Genetic Tests:

🧪 Blood Tests:

📄 Genetic Report:

Frequently Asked Questions About Progesterone and CYP2C19 rs4244285

How does the CYP2C19 rs4244285 genotype affect progesterone metabolism?

CYP2C19 helps break down progesterone, especially supplemental or therapeutic progesterone. Your rs4244285 genotype can change how quickly the liver clears progesterone: AA (poor metabolizer) tends to metabolize progesterone more slowly, AG (intermediate metabolizer) is typically slower than average, and GG (normal metabolizer) usually clears progesterone at a typical rate.

What side effects or hormone imbalance risks are linked to slower CYP2C19 progesterone clearance?

Slower CYP2C19 activity can increase circulating progesterone exposure, which may raise the chance of hormone-related side effects. These may include effects on mood, libido, sleep, and fertility, particularly for those with the AA genotype. People taking CYP2C19-metabolized medications may also have increased side-effect risk due to slower drug clearance.

What diet, supplements, and lifestyle steps can support progesterone clearance with CYP2C19 variants?

You can support liver detoxification and hormone balance by eating more cruciferous vegetables (like broccoli, kale, and Brussels sprouts) to support Phase II detox pathways, and including polyphenol-rich foods (berries, green tea, and colorful produce). Consider discussing targeted supplements with your clinician—such as sulforaphane, NAC, resveratrol (cautiously with medications), or calcium D-glucarate. Also avoid grapefruit and bergamot (which can further inhibit CYP2C19), limit alcohol and highly processed foods, prioritize restorative sleep, manage stress, reduce endocrine-disruptor exposure (e.g., BPA/phthalates), and use medication review and hormone monitoring with your healthcare provider if you’re on progesterone therapy or CYP2C19-metabolized drugs.

What tests can help me learn more about Progesterone and CYP2C19 rs4244285?

The Hormone, Thyroid, and Reproductive Health Genetic Test delivers over 85 personalized genetic insights through a comprehensive Hormone & Fertility Genetic Report, explaining inherited tendencies related to hormonal balance, reproductive function, and endocrine signaling. The Mens Hormone and Fertility Health Genetic Report translates your results into personalized, actionable guidance. Your healthcare provider can also recommend targeted blood tests based on your specific pathway results and health history to complement your genetic insights with current biomarker data.

Medical and Editorial Standards

Medical review process: This article was reviewed for medical accuracy, scientific clarity, evidence alignment, and appropriate discussion of genetics, medications, supplements, biomarkers, and health-related claims.

Sources and evidence: PlexusDx educational content is developed using peer-reviewed research, clinical literature, reputable medical references, and, where applicable, public health or regulatory guidance. References are included at the end of the article when scientific, medical, or health-related claims are discussed.

Commercial transparency: PlexusDx offers genetic testing, blood biomarker testing, personalized supplement recommendations, and related precision wellness services. Product mentions are intended to help readers understand available options and should not be interpreted as medical advice.

Important disclaimer: PlexusDx educational content is for informational purposes only and should not be used as a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making decisions about medications, supplements, genetic testing, lab testing, or health-related care.