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Benefits of I3C (Indole-3-Carbinol)

This content is for informational purposes only and does not constitute medical advice. Consult your healthcare provider before starting any supplement. Full disclaimer

Evidence-Based Benefits

  • Estrogen metabolism — 400mg daily increased the 2:16-hydroxyestrone ratio by approximately 50% in a 12-week RCT (Bradlow et al., 1991; Reed et al., 2005)
  • Cervical health — 200-400mg daily promoted regression of CIN in a pilot study of 30 women over 12 weeks (Bell et al., 2000)
  • Detoxification support — I3C upregulates Phase I and Phase II liver detoxification enzymes (CYP1A1, GST)
  • Antioxidant activity — I3C metabolites demonstrate free radical scavenging in cell-based assays

What the Research Says

I3C has been studied for estrogen metabolism modulation since the early 1990s. Bradlow et al. first demonstrated its ability to shift estrogen metabolism toward 2-hydroxylation. A notable pilot study by Bell et al. (2000) in Gynecologic Oncology showed 50% regression of CIN 2-3 at 200-400mg daily over 12 weeks. However, the variable metabolite profile created during gastric acid conversion has led many practitioners to recommend DIM as a more predictable alternative.

Related Conditions

Hormonal Imbalance
Full I3C (Indole-3-Carbinol) Guide

References

  1. (). Placebo-controlled trial of indole-3-carbinol in the treatment of CIN. Gynecologic Oncology. DOI
  2. (). Single-dose and multiple-dose administration of indole-3-carbinol to women: pharmacokinetics based on 3,3'-diindolylmethane. Cancer Epidemiology, Biomarkers & Prevention. DOI