Limited evidenceWomen's health

Estrogen Detox Formulas

DIM, indole-3-carbinol and calcium D-glucarate blends sold to help the body clear excess oestrogen. They do measurably shift a urinary oestrogen-metabolite ratio in trials; whether that shift produces any symptom or health benefit has never been demonstrated.

Evidence last reviewed: August 2026

What the science says

Shifts the 2:16 hydroxyestrone ratio Moderate evidence
A randomized, double-blind, cross-over trial in 148 premenopausal women found a nutraceutical containing indole-3-carbinol and green tea catechins raised the urinary 2-OHE1:16α-OHE1 ratio substantially versus placebo over 12 weeks. A separate 12-month randomized trial of BR-DIM in 130 women on tamoxifen also raised the ratio and increased SHBG.
Biomarker change has not translated into outcomes Limited evidence
In that same tamoxifen trial, DIM produced no change in breast density by mammography or MRI, and it reduced plasma levels of active tamoxifen metabolites including endoxifen. Moving a surrogate marker is not the same as improving health, and here it came with a plausible harm.
Results are not consistent across trials Limited evidence
A randomized double-blind trial of 75 mg DIM daily for 30 days in 60 premenopausal women failed to raise the oestrogen metabolite ratio at its primary endpoint. Dose, duration and population all appear to matter, and none of them are settled.

Dosage & safety

Studied doseTrials used 100–300 mg per day of bioavailable DIM (BR-DIM at 150 mg twice daily in the tamoxifen study), or indole-3-carbinol around 300–400 mg daily. Calcium D-glucarate, common in these blends, has no human efficacy trials at any dose.

SafetyReported effects include nausea, headache, darkened urine and, at high doses, transient changes in mood or menstrual pattern. Important interaction: DIM lowered active tamoxifen metabolites in a randomized trial, so avoid it if you take tamoxifen. Cruciferous compounds also induce CYP1A2, which can affect several drugs. Avoid in pregnancy and breastfeeding, and speak to an oncologist before use with any hormone-sensitive cancer.

Scientific references

A randomized, double-blind, placebo-controlled, cross-over trial to evaluate the effect of EstroSense(®) on 2-hydroxyestrone:16α-hydroxyestrone ratio in premenopausal women
Green T, See J, Schauch M — J Complement Integr Med, 2023
A randomized, placebo-controlled trial of diindolylmethane for breast cancer biomarker modulation in patients taking tamoxifen
Thomson CA, Chow HHS, Wertheim BC — Breast Cancer Res Treat, 2017
Effectiveness of 3,3'-Diindolylmethane Supplements on Favoring the Benign Estrogen Metabolism Pathway and Decreasing Body Fat in Premenopausal Women
Godínez-Martínez E, Santillán R, Sámano R — Nutr Cancer, 2023

Where to buy

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