Vitex
Vitex agnus-castus (Chasteberry)
Leading herb for women's hormonal balance, with strong evidence for PMS relief and menstrual cycle regulation.
Vitex, also known as chasteberry, is the most well-researched herb for women's hormonal health. It works on the pituitary gland to help regulate the balance between estrogen and progesterone. Clinical evidence supports its use for PMS symptoms, irregular cycles, and luteal phase defects. A first-line natural option for many hormonal complaints.
Mechanisms of Action
Dopamine Modulation
Acts on dopamine receptors in the pituitary
Hormonal Regulation
Helps balance estrogen and progesterone
Recommended Dose
20-40mg extract (standardized to 0.5% agnuside)
Optimal Timing
- Morning
- Consistently at same time daily
Can be taken without food
Best Form
Standardized extract (0.5% agnuside or 0.6% aucubin)
Alternatives: Dried berry tincture, Whole berry powder
Standardized extracts are most studied. BNO 1095 and Ze 440 are well-researched extract types.
Duration
Minimum: 12 weeks
Optimal: 24 weeks
Cycling: Not required
Note: Take continuously throughout the cycle, not just during luteal phase. Effects build over 2-3 cycles.
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PMS Relief
Significant reduction in PMS symptoms
Cycle Regulation
More regular menstrual cycles
Reduced Breast Tenderness
Less mastalgia/breast pain
Discontinue once pregnancy confirmed
May reduce milk supply due to prolactin effects; use with caution
Often used to support fertility; discontinue upon pregnancy
Who Should NOT Take This
- Pregnancy (discontinue when pregnant)
- Hormone-sensitive conditions (breast cancer, etc.)
- IVF or fertility treatments (may interfere)
Drug Interactions
May reduce effectiveness
May interact due to dopaminergic activity
May alter hormone levels
May interfere with protocols
Possible Side Effects
Tip: Take with food if needed
Tip: Usually resolves
Tip: Discontinue if rash occurs
Tip: Normal during adjustment; give 2-3 cycles
Warnings
- Discontinue when pregnancy is confirmed
- May reduce milk supply in nursing mothers
- Takes 2-3 cycles to see full effects — be patient
- May initially cause cycle irregularity before normalizing
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Top studies from 40+ peer-reviewed papers
Christelle K et al. • The Cochrane database of systematic reviews (2022)
“Findings from this review should be interpreted with caution due to low- and very low-certainty evidence.”
Key Findings:
- Treatment of heavy menstrual bleeding Cu IUD Vitamin B1 resulted in fewer pads used per day (mean difference (MD) -7.00, 95% confidence interval (CI) -8.50 to -5.50) and fewer bleeding days (MD -2.00, 95% CI -2.38 to -1.62; 1 trial; 110 women; low-certainty evidence) compared to placebo.
- The evidence is very uncertain about the effect of naproxen on the volume of menstruation compared to placebo (odds ratio (OR) 0.09, 95% CI 0.00 to 1.78; 1 trial, 40 women; very low-certainty evidence).
- Treatment with mefenamic acid resulted in less volume of blood loss compared to tranexamic acid (MD -64.26, 95% CI -105.65 to -22.87; 1 trial, 94 women; low-certainty evidence).
- However, there was no difference in duration of bleeding with treatment of mefenamic acid or tranexamic acid (MD 0.08 days, 95% CI -0.27 to 0.42, 2 trials, 152 women; low-certainty evidence).
Csupor D et al. • Complementary Therapies in Medicine (2019)
“Vitex agnus-castus was significantly superior to placebo in treating premenstrual syndrome across pooled analyses.”
Key Findings:
- Vitex significantly reduced overall PMS symptom scores vs placebo
- Most effective for irritability, mood swings, and breast tenderness
- Standardized extracts (Ze 440 and BNO 1095) had strongest evidence
Yeung KS et al. • Phytotherapy research : PTR (2018)
“However, well-designed larger clinical trials are needed before these herbs can be recommended and to further assess their psycho-oncologic relevance.Copyright © 2018 John Wiley & Sons, Ltd.”
Key Findings:
- Overall, 45% of studies reported positive findings with fewer adverse effects compared with conventional medications.
- Based on available data, black cohosh, chamomile, chasteberry, lavender, passionflower, and saffron appear useful in mitigating anxiety or depression with favorable risk-benefit profiles compared to standard treatments.
- These may benefit cancer patients by minimizing medication load and accompanying side effects.
- However, well-designed larger clinical trials are needed before these herbs can be recommended and to further assess their psycho-oncologic relevance.Copyright © 2018 John Wiley & Sons, Ltd.
Izzo AA et al. • Phytotherapy research : PTR (2016)
“Copyright © 2016 John Wiley & Sons, Ltd.Copyright © 2016 John Wiley & Sons, Ltd.”
Key Findings:
- A critical evaluation of the clinical data regarding the adverse effects has shown that herbal remedies are generally better tolerated than synthetic medications.
- Nevertheless, potentially serious adverse events, including herb-drug interactions, have been described.
- This suggests the need to be vigilant when using herbal remedies, particularly in specific conditions, such as during pregnancy and in the paediatric population.
- Copyright © 2016 John Wiley & Sons, Ltd.Copyright © 2016 John Wiley & Sons, Ltd.
Manouchehri A et al. • JBRA assisted reproduction (2023)
“Various studies have shown that herbal medicines can improve PCOS symptoms in women with minimal side effects but a longer treatment cycle.”
Key Findings:
- Various studies have shown that herbal medicines can improve PCOS symptoms in women with minimal side effects but a longer treatment cycle.
- Published in JBRA assisted reproduction (2023)
- Further research warranted to confirm findings
Study Type Distribution
Goals This Supplement Supports
This information is for educational purposes only and is not intended as medical advice. Always consult a qualified healthcare provider before starting any supplement.