NutriStack
DIM and Estradiol, a caution.
DIM shifts estrogen metabolism toward 2-hydroxy metabolites (less potent), potentially reducing estradiol's effectiveness for menopausal symptom control.
One pair, every claim cited. The two substances, the type, the mechanism, the recommendation, and the primary literature.
Same shape as the other 1,729 pairs in the public database.
From the interaction database
What the row says.
Every entry follows the same shape: what is happening, the mechanism, the recommendation, and the primary literature.
At a glance
- Pair type
- Caution
- Evidence (highest tier)
- Emerging
- Source citations
- 3 sources
- Stack Score effect
- −5 to your Stack Score (per scored caution row).
- Scope
- Supplement × Prescription
- Last verified
- May 30, 2026
Caution · Emerging evidence
Caution
What is happening. DIM shifts estrogen metabolism toward 2-hydroxy metabolites (less potent), potentially reducing estradiol's effectiveness for menopausal symptom control.
Mechanism. DIM induces CYP1A1/CYP1A2, shifting estrogen metabolism toward 2-hydroxylation (producing 2-OHE1, which is less estrogenic). This can reduce the net estrogenic effect of estradiol HRT.
Recommendation. If using DIM with estradiol HRT, monitor symptom control. DIM may reduce estradiol effectiveness. Discuss with your prescriber.
Sources (3)
- Thomson CA et al. Chemopreventive properties of 3,3'-diindolylmethane. Mutat Res. 2004;555(1-2):149-157. PMID 15476857
- Yerushalmi R, Bargil S, Ber Y, Ozlavo R, Sivan T, Rapson Y et al.. 3,3-Diindolylmethane (DIM): a nutritional intervention and its impact on breast density in healthy BRCA carriers. A prospective clinical trial.. Carcinogenesis. 2020. PMID 32458980
- Godnez-Martnez E, Santilln R, Smano R, Chico-Barba G, Tolentino MC, Hernndez-Pineda J. Effectiveness of 3,3'-Diindolylmethane Supplements on Favoring the Benign Estrogen Metabolism Pathway and Decreasing Body Fat in Premenopausal Women.. Nutrition and Cancer. 2023. PMID 36111381
Stack Score
How this pair moves the number.
Effect on the composite score
If both DIM and Estradiol are in the same stack, this pair applies −5 to your Stack Score (per scored caution row).
The full algorithm, the clamping rules, and four worked stacks are documented at /methodology/stack-score.
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