Vitex (PMS)
Also known as: Chasteberry, Vitex agnus-castus, Monk's pepper
Overview
Well-researched herb for PMS symptoms, supporting progesterone and reducing prolactin.
Frequently Asked About Vitex (PMS)
How much Vitex (PMS) should I take?
When is the best time to take Vitex (PMS)?
Should I take Vitex (PMS) with food?
Does Vitex (PMS) interact with medications?
What does Vitex (PMS) pair well with?
Who should not take Vitex (PMS)?
What are the side effects of Vitex (PMS)?
Dosage
3-6 months for full effect
PMS, luteal phase symptoms, breast tenderness
Research & Studies
We haven’t curated landmark studies for Vitex (PMS)yet — one-click into the primary literature here. PubMed (RCTs) is usually the highest-signal starting point.
Mechanism of Action
- • Supports progesterone in luteal phase
- • Reduces prolactin
- • Regulates LH/FSH
- • Takes 3+ cycles for effect
Evidence Quality
Strong evidence for PMS symptom reduction
Safety & Contraindications
- • May affect birth control
- • Not with IVF
- • Pregnancy
- • Hormone-sensitive cancers
- • IVF/fertility treatments
- • Headache
- • GI upset
- • Acne initially
- • Cycle changes
Avoid in pregnancy, galactagogue for breastfeeding
Safe
Interactions
- • Birth control (may reduce efficacy)
- • Dopamine agonists
- • B6, Magnesium for PMS
- • Empty stomach AM
Stacking & Synergies
Buying Guide
- • Standardized to agnusides
- • Quality extract
- • Takes 3+ cycles for effect
- • Morning empty stomach
- • May worsen before better initially
Related Guides
In-depth guides covering Vitex (PMS) — protocols, comparisons, and use cases.
More in Hormone Support
Other ingredients in the Hormone Support category.
Cite this page
Formulate Research Team. (2026, June). Vitex (PMS) — Evidence-Based Supplement Guide. Formulate Supplement Encyclopedia. https://app.formulate-health.app/learning/supplements/vitex-pms
Educational content based on published research and our scoring methodology. Not medical advice — consult a qualified healthcare provider before starting, stopping, or changing supplements, especially if you take medications, are pregnant, or have a medical condition.