About DIM
A metabolite of indole-3-carbinol found in cruciferous vegetables. Studied primarily for modulating estrogen metabolism — shifts the 2-OHE1:16α-OHE1 ratio toward the protective 2-hydroxy pathway. RCTs (Del Priore 2010, Dalessandri 2004, Heath 2020) consistently show this biomarker shift at 100–300 mg/day. However, evidence for hard clinical endpoints (cancer prevention, symptom improvement) remains unproven. BioResponse DIM (microencapsulated) is the form used in virtually all clinical trials — plain crystalline DIM has roughly 5–10x lower absorption. May interact with CYP1A2 substrates. Not an essential nutrient; no RDA or UL established.
What DIM supports
- Modulates estrogen metabolism toward protective pathway
- Studied for hormonal balance support
How much DIM to take
The RDA prevents deficiency. The effective range is what clinical trials used to actually move the outcome.
Effective
100–300
mg
100–300 mg/day of bioavailable (microencapsulated) DIM used in RCTs. Plain crystalline DIM has very poor absorption.
Clinical evidence
Limited clinical evidence. 8–12 small RCTs show consistent estrogen metabolite shifts; no meta-analyses exist; no hard clinical endpoints proven
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