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Diindolylmethane
Shifts estrogen metabolism toward beneficial 2-hydroxy metabolites, reducing harmful estrogen dominance in both men and women.
What the evidence says
DIM appears to help in 3 of 4 studies with measurable effects — the evidence leans clearly favourable.
Most evidence is from high-quality randomised trials published 2004–2025 with a typical study size of 25 participants.
Based on 36 studies · 14 RCTs · 389 total participants
Confidence
ModerateWhat the studies found
By outcome
DIM has an evidence score of 8.5/10 — very strong evidence based on 36 indexed studies. Shifts estrogen metabolism toward beneficial 2-hydroxy metabolites, reducing harmful estrogen dominance in both men and women.
The commonly studied dose of DIM is 100-200mg. Research points to an estimated optimal dose around 200mg, with a minimum effective dose near 100mg. Individual response varies — start low and adjust.
The best time to take DIM is with meals. Take it with food. DIM (3,3'-diindolylmethane) is a lipophilic metabolite of indole-3-carbinol formed from cruciferous vegetables.
Last reviewed May 2026 · evidence from 37 studies · how we score
This information is for educational purposes only. It is not a substitute for professional medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement or medication.
DIM is a compound formed when you digest cruciferous vegetables like broccoli and cauliflower. It supports healthy estrogen metabolism by promoting the conversion of estrogen to beneficial metabolites rather than harmful ones. Used by both men and women for hormonal balance, and popular among those concerned about estrogen dominance.
Shifts estrogen toward beneficial metabolites
May help balance estrogen production
How DIM works — from molecular targets to health outcomes. Click an edge to see supporting research.This visualization is in beta — pathways are being refined and expanded.
100-200mg
Take with food
| Form | Type |
|---|---|
| 💊Microencapsulated DIM (BioResponse DIM) | Recommended |
| 💊Standard DIM capsules | Alternative |
Regular DIM has poor absorption. Enhanced/microencapsulated forms are much better absorbed.
Minimum: 4 weeks
Optimal: 12 weeks
Cycling: Not required
Note: Fat improves absorption. Can be taken any time of day.
Evidence primarily from preclinical studies and mechanistic research. Clinical data limited to prostate cancer studies showing detectable DIM levels. Bioavailability varies significantly by form - standard crystalline DIM has poor absorption compared to enhanced formulations. Dark urine is common but harmless.
Healthier estrogen metabolism
May reduce estrogen-related symptoms
Avoid — may affect hormones
Consult doctor before use
May affect hormone levels and metabolism
May affect drug metabolism
Tip: Reduce dose; ensure adequate hydration
Tip: Take with food
Tip: Normal and harmless
DIM is generally safe at recommended doses, with a few precautions worth noting. The most commonly reported side effects are headache, GI upset, dark urine. Use caution if any of these apply to you: Hormone-sensitive cancers (consult oncologist); Pregnancy.
Indole-3-Carbinol
Likely helpsConverts to DIM in the stomach, shifting estrogen metabolism toward favorable 2-hydroxy metabolites for hormonal balance.
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