Can You Take Indole-3-Carbinol and Soy Protein Isolate Together?

Dose or timing may matter

The short answer

I3C shifts estrogen metabolism toward 2-hydroxy metabolites, while soy isoflavones provide estrogenic stimulation. The opposing mechanisms may reduce each other's benefits.

How to arrange timing

Consider aligning your approach — either estrogen metabolism support or phytoestrogen supplementation.

Reference

Reference noted for this combination: Cancer Epidemiology Biomarkers & Prevention, 2004; 13(9): 1513-1520

Important context

Whether supplements suit you together also depends on dose, product formulation, health conditions, and medication use. Ask a doctor or pharmacist first if you take medication, are pregnant or breastfeeding, or have a chronic condition.