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Types of Indole-3-Carbinol (I3C): Forms & Bioavailability

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Forms Comparison

FormBioavailabilityBest For
I3C CapsulesModerate (variable stomach pH-dependent conversion)HPV-related conditions — most clinical studies used I3C directly; for estrogen modulation, DIM is often preferred
Cruciferous Vegetable ExtractLow-ModerateBroad cruciferous benefits — provides I3C alongside other glucosinolates (sulforaphane precursors)

I3C Capsules

Bioavailability: Moderate (variable stomach pH-dependent conversion). Best for: HPV-related conditions — most clinical studies used I3C directly; for estrogen modulation, DIM is often preferred.

Cruciferous Vegetable Extract

Bioavailability: Low-Moderate. Best for: Broad cruciferous benefits — provides I3C alongside other glucosinolates (sulforaphane precursors).

References

  1. (). Indole-3-carbinol for recurrent respiratory papillomatosis: long-term results. Journal of Voice.
  2. (). Placebo-controlled trial of indole-3-carbinol in the treatment of CIN. Gynecologic Oncology. DOI
  3. (). Single-dose and multiple-dose administration of indole-3-carbinol to women: pharmacokinetics based on 3,3'-diindolylmethane. Cancer Epidemiology, Biomarkers & Prevention. DOI