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DIM

modulating estrogen metabolism

Evidence · Grade B
Traditional useInteraction risk

DIM is a compound from cruciferous vegetables that may influence estrogen metabolism by promoting beneficial estrogen metabolites, though human evidence is limited.

Last reviewed June 12, 2026 · AI-assisted, human-reviewed
DIM (Diindolylmethane) is a compound derived from the digestion of indole-3-carbinol, found in cruciferous vegetables. It is commonly used in addressing conditions related to estrogen dominance due to its influence on estrogen metabolism.

Quick answer

What it is: DIM (Diindolylmethane) is a compound derived from the digestion of indole-3-carbinol, found in cruciferous vegetables.

May support:Estrogen Dominance

Evidence:Evidence · Grade B

Evidence Summary

Evidence · Grade B

The current understanding of DIM's effects is primarily derived from in vitro studies and animal models. While these studies provide insights into potential mechanisms, there is a lack of high-quality human clinical trials, such as randomized controlled trials, to establish its efficacy and safety for specific health conditions.

Last reviewed · Jun 2026

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Why It Works

DIM helps to modulate estrogen metabolism by promoting a healthier balance of estrogen metabolites. Specifically, it shifts the metabolism of estrogen towards the production of 2-hydroxyestrone (a 'good' estrogen metabolite) rather than 16-alpha-hydroxyestrone (a less favorable metabolite), which is associated with estrogen dominance symptoms and increased risk of certain cancers.

How it works in more detail

Diindolylmethane (DIM) is a metabolite of indole-3-carbinol (I3C), which is formed in the stomach from glucobrassicin found in cruciferous vegetables. DIM is thought to interact with estrogen receptors and enzymes involved in estrogen metabolism, particularly cytochrome P450 enzymes. It may promote the activity of CYP1A1 and CYP1B1, leading to an increased production of 2-hydroxyestrone (2-OHE1), often considered a 'good' estrogen metabolite. Concurrently, it may reduce the formation of 16-alpha-hydroxyestrone (16α-OHE1), which is sometimes associated with less favorable estrogenic activity. This shift in the 2-OHE1/16α-OHE1 ratio is a key proposed mechanism by which DIM may exert its effects on estrogen balance.

How to use

Always consult a qualified clinician.

Editorial guidance

Suggested dosage
Typically 100-300 mg per day, often split into two doses, taken with food for better absorption.
Research dosage range
Research dosages have varied widely, with some studies using doses from 50 mg to 300 mg per day in human subjects, though the number of such studies is limited.
Typical onset
The onset of effects for DIM is not well-established due to limited human clinical data. Any potential changes in hormone metabolism would likely occur gradually over weeks to months of consistent use
Typical forms
capsule, tablet
Quality markers
When purchasing DIM supplements, look for products from reputable manufacturers that provide third-party testing for purity and potency. Ensure the product lists the exact amount of DIM per serving and is free from unnecessary fillers or artificial ingredients.
Medication interactions
  • hormone replacement therapy
  • oral contraceptives
  • tamoxifen
Avoid if
  • pregnant
  • breastfeeding
  • hormone-sensitive conditions (e.g., certain cancers)
  • taking hormone-related medications

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Suggested dosage

Typically 100-300 mg per day, often split into two doses, taken with food for better absorption.

General guidance — discuss specifics with a clinician.

Active medicinal compounds

Diindolylmethane (DIM)

Traditional use

DIM itself does not have a history of traditional use as an isolated compound. Its precursors are found in cruciferous vegetables, which have been consumed for centuries as part of traditional diets and recognized for their health benefits, but not specifically for their DIM content.

Safety

Safety warnings

Generally considered safe for most individuals when taken within recommended dosages. Some reported side effects include darkening of urine, headaches, and gastrointestinal discomfort. Pregnant or breastfeeding women should avoid use.

Avoid if

  • pregnant
  • breastfeeding
  • hormone-sensitive conditions (e.g., certain cancers)
  • taking hormone-related medications

Medication interactions

  • hormone replacement therapy
  • oral contraceptives
  • tamoxifen

Reported side effects

  • headache
  • nausea
  • darkening of urine
  • gastrointestinal upset

General guidance — discuss specifics with a clinician.

Evidence ecosystem

Scientific literature, clinical guidance, government sources, ongoing research, traditional use, and lived experience — grouped by source type and quality.

No indexed evidence yet. We're still building out this remedy's evidence ecosystem.

Limitations: A significant limitation is the scarcity of human clinical trials, particularly large-scale, placebo-controlled studies. Most available research is preclinical or involves small human cohorts, making it difficult to draw definitive conclusions about efficacy, optimal dosing, and long-term safety in humans. The existing studies often focus on surrogate markers (like estrogen metabolite ratios) rather than clinical outcomes.

This page is educational. Statements use phrases like "may support" and "has been studied for"because no remedy here is approved to cure, treat, or reverse any condition. Discussion happens on the ailment pages — community statistics here are derived from those reports. Always consult a qualified clinician.

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