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 CYP3A4 Variations Affect Estrogen Metabolism and Men’s Hormone Health

Estrogen is commonly thought of as a female hormone, but it plays important roles in men too. Proper estrogen balance supports bone health, brain function, libido, and sperm production. The liver enzyme CYP3A4 helps break down estrogen into different metabolites. Certain genetic variations in the CYP3A4 gene can change how quickly estrogen is converted into specific metabolites, including 16α-hydroxyestrone (16α-OHE1). When 16α-OHE1 is produced in excess it may contribute to hormone imbalances and increase risk for prostate-related problems or other estrogen-related concerns.

What this means for you

Your genotype at rs2740574 in the CYP3A4 gene influences enzyme activity and the relative production of estrogen metabolites.

CC — Two effect alleles (higher CYP3A4 activity)

You carry two copies of the effect allele. This genotype is associated with increased CYP3A4 enzyme activity, which can speed conversion of estradiol toward 16α-hydroxyestrone (16α-OHE1). Elevated 16α-OHE1 over time may be linked to higher risk for prostate issues and hormone imbalances.

  • Diet: Aim to include cruciferous vegetables daily — broccoli, cabbage, Brussels sprouts, cauliflower and kale — to support healthier estrogen pathway balance.
  • Supplements to consider: DIM (diindolylmethane), sulforaphane-rich extracts, N-acetylcysteine (NAC), and antioxidant support such as resveratrol. These can support liver detoxification and favorable estrogen metabolism. Discuss doses with your provider.
  • Lifestyle: Limit alcohol, stop smoking, and reduce exposure to environmental estrogens such as BPA, phthalates, and some personal care chemicals. Maintain a healthy weight and regular physical activity to support hormone balance.
  • Gut and elimination: Consume high-fiber foods and consider probiotic-supporting foods to encourage estrogen excretion through bowel movements.
  • Medication interactions: Avoid grapefruit if you are taking medications metabolized by CYP3A4, and always check with your prescriber before combining supplements and prescription drugs.
  • Monitoring: Regular hormone panels and prostate health screening (PSA and clinical exams as recommended by your provider) are advised to track changes over time.
CT — One effect allele (moderately increased CYP3A4 activity)

You carry one copy of the effect allele. This genotype is associated with increased CYP3A4 activity compared with the non-effect genotype, tending to push estrogen metabolism toward 16α-OHE1 to a lesser degree than two copies would. This may slightly raise risk for prostate issues or hormone shifts.

  • Diet: Regularly include cruciferous vegetables and plenty of fiber. Aim for a colorful whole-food pattern rich in vegetables, lean proteins, and healthy fats.
  • Supplements to consider: DIM, sulforaphane-containing foods or extracts, and NAC may support balanced estrogen metabolism. Antioxidants such as vitamin C and polyphenols can aid detox pathways.
  • Lifestyle: Limit alcohol intake, do not smoke, minimize exposure to endocrine-disrupting chemicals, and maintain consistent exercise and sleep patterns.
  • Gut and elimination: Maintain a fiber-rich diet and supportive gut health practices to encourage estrogen clearance.
  • Medication interactions: Grapefruit can alter CYP3A4-mediated drug levels. Avoid grapefruit if you are on medications that list interactions, and consult your provider.
  • Monitoring: Consider periodic hormone testing and prostate health evaluations with your healthcare provider so any trends can be caught early.
TT — Zero effect alleles (typical CYP3A4 activity)

You carry two copies of the non-effect allele. This genotype is associated with typical CYP3A4 enzyme function. Your body metabolizes estrogen at a standard rate without genetically increased conversion toward 16α-OHE1. This baseline supports typical hormone balance and lowers genetic predisposition to estrogen-related concerns tied to excess 16α-OHE1.

  • Diet: Continue a balanced diet with regular intake of vegetables, fiber, and diverse nutrients to support natural hormone processing.
  • Supplements: Not routinely required solely for this genetic result. Use targeted supplements only when indicated by symptoms or lab results and under guidance from your provider.
  • Lifestyle: Maintain healthy habits—regular exercise, moderate alcohol use, no smoking, and reduced exposure to environmental estrogens—to preserve hormone health.
  • Monitoring: Routine health care, prostate exams and hormone testing as advised by your clinician remain appropriate.

Practical recommendations to support healthy estrogen metabolism

  • Eat cruciferous vegetables daily: These foods provide compounds that support estrogen detoxification enzymes and promote a more favorable balance of estrogen metabolites.
  • Prioritize fiber and gut health: Soluble and insoluble fiber, along with fermented foods or targeted probiotics, support removal of estrogens through the digestive tract.
  • Consider targeted supplements only after professional discussion: DIM, sulforaphane extracts, NAC, and antioxidant support can be helpful for some people but are best used under clinical supervision to avoid interactions or unintended effects.
  • Minimize exposure to environmental estrogens: Reduce use of plastics with BPA, avoid heating food in plastic containers, choose fragrance-free personal care products when possible, and be cautious with processed foods that may contain endocrine-disrupting additives.
  • Limit alcohol and stop smoking: Both can impair liver detoxification and worsen hormone balance.
  • Be aware of drug interactions: Grapefruit and certain supplements can affect CYP3A4 activity and alter levels of medications. Always check with your prescribing clinician or pharmacist.
  • Maintain regular medical surveillance: Work with your healthcare provider on appropriate hormone panels and prostate health checks based on age, family history, symptoms, and this genetic information.

Tests and monitoring to discuss with your healthcare provider

  • Serum hormone panel: total and free testosterone, estradiol, SHBG, and other hormones as indicated by symptoms.
  • Prostate monitoring: PSA testing and digital rectal exam as recommended for age and risk factors.
  • Liver function tests: if you plan to start supplements or medications that affect liver metabolism.
  • Comprehensive medication review: identify drugs metabolized by CYP3A4 to avoid interactions with grapefruit or supplements.

Important disclaimer

PlexusDx provides genetic education and information only. This content is not medical advice. Genetic results describe potential predispositions and do not diagnose disease or guarantee outcomes. Always discuss genetic results, new supplements, major diet changes, or medical screening plans with your healthcare provider before making changes to your health care or treatment plan.

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 Estrogen and CYP3A4 rs2740574

How does the CYP3A4 rs2740574 variant affect estrogen metabolism in men?

The CYP3A4 rs2740574 variant can influence how efficiently the liver enzyme CYP3A4 breaks down estrogen into metabolites, including 16α-hydroxyestrone (16α-OHE1). Different genotypes shift the balance of these metabolites, which may affect hormone balance and potentially increase concern for estrogen-related issues over time.

What are the differences for men with CYP3A4 rs2740574 genotypes CC, CT, and TT?

CC (two effect alleles) is associated with higher CYP3A4 activity and greater conversion toward 16α-OHE1, which may be linked to higher risk of prostate issues and hormone imbalances. CT (one effect allele) is associated with moderately increased activity and a smaller shift toward 16α-OHE1. TT (zero effect alleles) is associated with typical CYP3A4 activity and a baseline estrogen metabolism pattern with a lower genetic predisposition to excess 16α-OHE1-related concerns.

What lifestyle and monitoring steps help support healthy estrogen metabolism with this CYP3A4 result?

Support estrogen metabolism by eating cruciferous vegetables daily, prioritizing fiber and gut health to help elimination, minimizing exposure to environmental estrogens (like BPA/phthalates and some personal care chemicals), and limiting alcohol and avoiding smoking to protect liver detox pathways. Discuss monitoring with your healthcare provider, such as a serum hormone panel (total/free testosterone, estradiol, SHBG as indicated) and prostate screening (PSA and exam as recommended), especially if you plan supplements or medications that may interact with CYP3A4. Avoid grapefruit if you take medications metabolized by CYP3A4, and review all drugs and supplements with your clinician.

What tests can help me learn more about Estrogen and CYP3A4 rs2740574?

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.