Does Soy foods Affect Vitex / Chasteberry?

Amount or timing may matter

The short answer

Vitex modulates dopamine and progesterone pathways. Soy isoflavones' estrogenic activity may counteract vitex's hormone-balancing effects.

How to arrange timing

Avoid heavy soy intake when using vitex for hormonal balance; consult a practitioner.

Reference

Reference noted for this food and supplement combination: Wuttke et al., Phytomedicine 2003; Examine.com

Important context

The effect can also change with food amount, supplement 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.