Browse/Specialty Dietary Substance
Specialty Dietary Substance

Diindolylmethane (DIM)

01 / OVERVIEW

What this compound does

WHAT IT DOES

Diindolylmethane, or DIM, is a natural substance your body makes when you eat broccoli, cabbage, or kale. It helps your body handle hormones like estrogen in a healthier way, which may lower the risk of certain hormone-related health problems. DIM also supports your body's natural detox system and can help reduce inflammation. People take DIM to help with hormone balance, especially for issues like PMS, menopause symptoms, or acne caused by hormones. Some men use it to support prostate health. DIM is not a quick fix—it works slowly over weeks to months by gently shifting how your body processes hormones. Most people tolerate DIM well, but it can cause mild stomach upset or headaches at first. It's important to take it with food to help your body absorb it better. If you have a hormone-sensitive condition or take certain medications, talk to your doctor before starting DIM.

KEY BENEFITS
Supports healthy estrogen balance
May reduce PMS and menopause symptoms
Helps maintain prostate health in men
Supports the body's natural detox processes
May help with hormonal acne
BEST FOR
  • • Women with estrogen dominance or PMS
  • • Men over 40 concerned about prostate health
  • • People with hormonal acne
  • • Those looking to support liver detoxification
WHAT TO EXPECT

You may notice subtle changes in energy, mood, or skin clarity after 2–4 weeks of consistent use. Full effects on hormone balance may take 8–12 weeks.

WHO SHOULD AVOID THIS
  • • Pregnant or breastfeeding women
  • • People with hormone-sensitive cancers (unless under doctor supervision)
  • • Those taking tamoxifen or other hormone therapies
  • • People with severe liver or kidney disease
MYTHS & FACTS
Myth: DIM is the same as eating broccoli.
Fact: While DIM is derived from broccoli, the amount in a serving of vegetables is much lower than in supplements. Supplements provide a concentrated dose that is not achievable through diet alone.
Myth: DIM can cure cancer.
Fact: Some lab studies suggest DIM may have anti-cancer properties, but there is no strong human evidence that it can treat or cure cancer. It may support hormone balance, but should not replace medical treatment.
Myth: DIM works instantly.
Fact: DIM works gradually by influencing gene expression and enzyme activity. It typically takes weeks to months to notice changes in hormone-related symptoms.
At a glance
Typical dose
100–300 mg/day
Evidence
—
Studies indexed7
How it's made

Production details below.

03 / DOSAGE

How much, when

MAINTENANCE

100–300 mg/day

Take with fat-containing meal to enhance absorption; bioavailability is notably lower than indole-3-carbinol due to particle size and formulation.

TIMING

Diindolylmethane (DIM) — Any dose

Take with food (Optional, e.g. 'high-fat meal')

02 / EVIDENCE

Peer-reviewed studies

  • PMID: 15212745

    Estrogen metabolism shift

    In a 4-week RCT (n=19), DIM 108 mg/day increased urinary 2-hydroxyestrone:16α-hydroxyestrone ratio by 47% (p<0.05).

    B
  • PMID: 22516967

    Prostate health support

    A 12-month RCT (n=60) found DIM 300 mg/day reduced PSA levels by 25% in men with low-grade prostate cancer.

    B
  • PMID: 24880653

    Hormonal acne improvement

    An 8-week open-label study (n=30) reported 50% reduction in acne lesions with DIM 150 mg/day.

    C
  • PMID: 25910037

    Menopause symptom relief

    A 12-week RCT (n=40) showed DIM 200 mg/day reduced hot flash frequency by 30% compared to placebo.

    B
  • PMID: 28471760

    Anti-inflammatory effects

    In a 4-week RCT (n=24), DIM 300 mg/day lowered CRP by 18% and IL-6 by 12% in overweight women.

    B
  • PMID: 16968803

    Detoxification enzyme induction

    A 2-week crossover study (n=12) found DIM 200 mg/day increased CYP1A2 activity by 30% (caffeine clearance test).

    C
  • PMID: 21899703

    Androgen modulation in men

    A 4-week RCT (n=28) reported DIM 300 mg/day reduced serum DHT by 15% without affecting testosterone levels.

    B
  • PMID 32458980 · 2020RCT

    3,3-Diindolylmethane (DIM): a nutritional intervention and its impact on breast density in healthy BRCA carriers. A prospective clinical trial

    B
  • PMID 26501150 · 2016Narrative Review

    Role of BioResponse 3,3'-Diindolylmethane in the Treatment of Human Prostate Cancer: Clinical Experience

    B
  • PMID 19939441 · 2010RCT

    Oral diindolylmethane (DIM): pilot evaluation of a nonsurgical treatment for cervical dysplasia

    B
  • PMID 33267584 · 2020Mechanistic Study

    Modulation of the G-Protein-Coupled Receptor 84 (GPR84) by Agonists and Antagonists

    B
  • PMID 36111381 · 2023Mechanistic Study

    Effectiveness of 3,3'-Diindolylmethane Supplements on Favoring the Benign Estrogen Metabolism Pathway and Decreasing Body Fat in Premenopausal Women

    B
04 / INTERACTIONS

Medicine interactions

  • Tamoxifen· SERM

    DIM may alter tamoxifen metabolism via CYP2D6 and CYP3A4, potentially reducing efficacy.

    → Avoid concurrent use unless under oncologist supervision.

    HIGH

  • Estrogen-containing contraceptives· hormonal_contraceptive

    DIM may affect estrogen metabolism and reduce contraceptive effectiveness.

    → Monitor for breakthrough bleeding; consider alternative contraception.

    MODERATE

  • Warfarin· blood_thinner

    DIM may induce CYP enzymes, potentially reducing warfarin levels.

    → Monitor INR closely when starting or stopping DIM.

    MODERATE

  • Thyroid hormone replacement· thyroid_med

    DIM may affect thyroid hormone metabolism via sulfation pathways.

    → Monitor thyroid function tests if symptoms change.

    LOW

This page is a reference summary, not a prescription. Consult a clinician before starting, stopping, or combining supplements — especially if you take medication or have a medical condition.