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Vitex (Chasteberry)
Vitex agnus-castus is one of the better-evidenced women's herbs for premenstrual symptoms.
- Evidence
- Likely Effective
- Category
- Women's Health
- Best form
- Ze 440 (Zeller, Switzerland) - the 20mg/day standardized extract used in Schellenberg 2001 BMJ and several follow-up trials
- Effective dose
- 20mg/day of Ze 440 standardized extract, or 175-225mg/day of a generic extract standardized to 0.6% aucubin or agnusides. Whole fruit powder doses run much higher (500-1000mg) but with less predictable activity.
- Lab tested
- 4 of 7 products
- Category
- Women's Health
- Best form
- Ze 440 (Zeller, Switzerland) - the 20mg/day standardized extract used in Schellenberg 2001 BMJ and several follow-up trials
- Effective dose
- 20mg/day of Ze 440 standardized extract, or 175-225mg/day of a generic extract standardized to 0.6% aucubin or agnusides. Whole fruit powder doses run much higher (500-1000mg) but with less predictable activity.
- Lab tested
- 4 of 7 products
Key takeaways
- →Strongest evidence is for premenstrual comfort: 20mg/day Ze 440 beat placebo across 3 cycles in multiple trials.
- →Mechanism is mild prolactin reduction via dopamine D2 receptors at the pituitary, which is a real but modest hormonal effect.
- →Standardization matters: Ze 440 and BNO 1095 (Femicur) drive most positive data; generic 400mg fruit powders are not interchangeable.
- →Do not take while pregnant or breastfeeding because lowering prolactin can reduce milk supply.
What Is Vitex (Chasteberry)?
Vitex agnus-castus is one of the better-evidenced women's herbs for premenstrual symptoms. It is not a cure for any diagnosis, but multiple placebo-controlled trials in different countries have shown that standardized vitex preparations improve self-rated PMS scores more than placebo over three menstrual cycles. The mechanism is reasonably well understood for an herbal: vitex compounds act on dopamine D2 receptors in the pituitary, mildly suppressing prolactin release. Mild prolactin elevation in the luteal phase is one of the proposed drivers of cyclic breast tenderness and irritability, so a prolactin-lowering agent has a coherent biological story behind it.
The headline trial is Schellenberg 2001 in BMJ. 170 women with PMS were randomized to 20mg/day of Ze 440 (a standardized vitex extract) or placebo for three cycles. The active group improved significantly more on the main self-rated symptom score (P less than 0.001), and 52% of women in the vitex group were classified as responders versus 24% on placebo. He 2009 in Maturitas replicated the result in a multicenter Chinese trial of 217 women, again with three cycles of treatment. Berger 2000 in Archives of Gynecology and Obstetrics and Loch 2000 in the Journal of Women's Health both showed similar PMS improvements. The 2017 systematic review by van Die and colleagues (Planta Medica), and the 2019 meta-analysis in Complementary Therapies in Medicine, both concluded that standardized vitex was effective for PMS in 7 of 8 trials reviewed, with consistent direction of effect across different extracts.
The cyclic mastalgia data is also reasonably solid. Halaska 1999 in The Breast randomized 97 women with cyclical breast pain to a vitex solution or placebo and showed significantly greater pain reductions in the vitex group across two cycles. Wuttke and colleagues' 2003 review in Phytomedicine summarized the dopaminergic mechanism and the breast-pain evidence together: prolactin-driven mastalgia is the population most likely to respond. Outside PMS and cyclic mastalgia the evidence shrinks. Premenstrual dysphoric disorder (PMDD) shows mixed signals across smaller trials. Mild luteal phase defect with hyperprolactinemia has some early data. Menopausal hot flashes and acne have not been convincingly shown to respond to vitex in controlled work.
Standardization is the most important practical issue. Most positive trials used either Ze 440 (20mg/day) or BNO 1095 (Femicur). US OTC vitex products vary widely in extract type, ratio, and stated standardization, so two products both labeled "vitex 400mg" can deliver very different active compound loads. Safety is generally good in non-pregnant adults: mild GI upset, headache, transient cycle irregularity, and rare skin rash are the main reports. The non-negotiable contraindications are pregnancy, breastfeeding (because lowering prolactin can reduce milk supply), use with dopamine antagonists like antipsychotics, and known pituitary disorders. Concurrent use with hormonal contraception is a theoretical concern that has not been well studied; women on the pill should at least talk to a clinician before starting.
Does It Work? The Evidence
How A-F grades workPremenstrual symptom relief (irritability, mood changes, breast tenderness, headache)
Schellenberg 2001 BMJ RCT (n=170): Ze 440 20mg/day vs placebo over 3 cycles, 52% responders vs 24% placebo, P<0.001; He 2009 Maturitas multicenter Chinese RCT (n=217); Berger 2000 Arch Gynecol Obstet (n=43 completers); Loch 2000 J Womens Health observational study (n=1,634); van Die 2013 Planta Med systematic review of 12 RCTs concluded efficacy in 7 of 8 PMS trials
Cyclical breast tenderness (cyclic mastalgia)
Halaska 1999 The Breast double-blind RCT (n=97): vitex solution significantly reduced VAS pain scores vs placebo across 2 cycles; Wuttke 2003 Phytomedicine review summarizes mechanism and breast-pain evidence together
Premenstrual dysphoric disorder (PMDD)
Smaller trials in PMDD populations show signal but with significant heterogeneity in extract type, dose, and outcome scales; van Die 2013 systematic review notes some PMDD benefit but flags inconsistency
Mild hyperprolactinemia and luteal phase support
Small trials suggest vitex modestly lowers elevated prolactin and can lengthen short luteal phases in subfertile women; mechanism (D2 receptor agonism at pituitary) is consistent but trials are small and unreplicated by independent groups
Menopausal hot flashes and vasomotor symptoms
Mixed and underpowered trials, often combined with other botanicals (black cohosh, soy) so vitex's specific contribution is unclear; not a recommended first-line option for menopause
Acne and androgenic skin issues
No quality controlled trials in acne. Marketing claims rely on the prolactin-androgen axis but human data is absent
Fertility in healthy women without identified hormonal issue
Combination products containing vitex (FertilityBlend, others) show some signal in mixed-cause subfertility, but vitex's standalone contribution in healthy women is not established
| Grade | Claimed Benefit | Key Studies | Our Verdict |
|---|---|---|---|
| A | Premenstrual symptom relief (irritability, mood changes, breast tenderness, headache) | Schellenberg 2001 BMJ RCT (n=170): Ze 440 20mg/day vs placebo over 3 cycles, 52% responders vs 24% placebo, P<0.001; He 2009 Maturitas multicenter Chinese RCT (n=217); Berger 2000 Arch Gynecol Obstet (n=43 completers); Loch 2000 J Womens Health observational study (n=1,634); van Die 2013 Planta Med systematic review of 12 RCTs concluded efficacy in 7 of 8 PMS trials | Supported |
| A | Cyclical breast tenderness (cyclic mastalgia) | Halaska 1999 The Breast double-blind RCT (n=97): vitex solution significantly reduced VAS pain scores vs placebo across 2 cycles; Wuttke 2003 Phytomedicine review summarizes mechanism and breast-pain evidence together | Supported |
| B | Premenstrual dysphoric disorder (PMDD) | Smaller trials in PMDD populations show signal but with significant heterogeneity in extract type, dose, and outcome scales; van Die 2013 systematic review notes some PMDD benefit but flags inconsistency | Conflicted |
| C | Mild hyperprolactinemia and luteal phase support | Small trials suggest vitex modestly lowers elevated prolactin and can lengthen short luteal phases in subfertile women; mechanism (D2 receptor agonism at pituitary) is consistent but trials are small and unreplicated by independent groups | Early Signal |
| D | Menopausal hot flashes and vasomotor symptoms | Mixed and underpowered trials, often combined with other botanicals (black cohosh, soy) so vitex's specific contribution is unclear; not a recommended first-line option for menopause | Not There Yet |
| F | Acne and androgenic skin issues | No quality controlled trials in acne. Marketing claims rely on the prolactin-androgen axis but human data is absent | Not There Yet |
| D | Fertility in healthy women without identified hormonal issue | Combination products containing vitex (FertilityBlend, others) show some signal in mixed-cause subfertility, but vitex's standalone contribution in healthy women is not established | Not There Yet |
How to Choose: Forms, Doses & What Matters
Clinical dose: 20mg/day of Ze 440 standardized extract, or 175-225mg/day of a generic extract standardized to 0.6% aucubin or agnusides. Whole fruit powder doses run much higher (500-1000mg) but with less predictable activity.
Best forms: Ze 440 (Zeller, Switzerland) - the 20mg/day standardized extract used in Schellenberg 2001 BMJ and several follow-up trials, BNO 1095 (Femicur, Bionorica) - the German extract used in Berger 2000 and Wuttke pharmacology work, Generic standardized extract (0.5-0.6% aucubin or agnusides), typically dosed 175-225mg/day, Liquid phyto-cap or tincture, useful when standardization is documented but dosing varies, Whole dried fruit powder, much higher mg required and active compound content varies batch to batch
For Ze 440 products, take one 20mg tablet daily, in the morning, with or without food. For generic standardized extracts, take 175-225mg once daily. For the Schellenberg trial protocol, dosing was continuous (every day, not just luteal phase) for three full menstrual cycles before assessing response. Taking it only during PMS days is not how it was studied and is unlikely to give you the same effect. Allow at least 2 cycles before deciding it isn't working; many women do not see clear improvement until cycle 3. Note that some people experience transient cycle changes (early or late period, spotting) in the first 1-2 cycles as the prolactin shift settles in; this usually resolves. If it persists past 3 cycles or causes concerning symptoms, stop.
Who Should Take Vitex (Chasteberry)?
Adult women with cyclic premenstrual symptoms (irritability, breast tenderness, mood swings, bloating, headache) who want a non-prescription option with reasonable evidence behind it. People with cyclical breast pain (mastalgia) tied to the menstrual cycle have one of the strongest indications. Women with mild, lab-confirmed prolactin elevation can discuss vitex with their clinician as a low-risk option. Plan on a full 3-cycle trial before judging whether it is helping; the published trials all measured at 3 months, not at 1 week.
Who Should Avoid It?
Not for everyone
Side Effects & Safety
Product Scores
7 products scored on dosing accuracy, third-party testing, cost per effective dose, and label transparency.
The Scorecard: 7 Products Compared
Femaprin Vitex Extract with Vitamin B6, 60 Capsules
Nature's Way
$17.99 ÷ 60 days at 40mg/day (1 serving × 40mg)
Femaprin is the most clinically credible vitex product widely available in the US, and the once-daily standardized format matches how the trial-quality evidence was generated
Prices checked 2026-04-28. Cost shown is per clinically effective daily dose, not per pill.
Chaste Tree (Vitex) 225mg, 120 Capsules
Pure Encapsulations$47.40 ÷ 118 days at 225mg/day (1 serving × 225mg)
Best option for people with sensitivities or who want a clean-label, allergen-free formulation; the long supply also makes a full 3-cycle trial straightforward
Prices checked 2026-04-28. Cost shown is per clinically effective daily dose, not per pill.
Chaste Tree Berry Extract, 60 Capsules
Vitanica
$26.95 ÷ 60 days at 225mg/day (1 serving × 225mg)
Vitanica is built around naturopathic women's health and has a track record specifically in this category; pick this if brand specialty matters to you
Prices checked 2026-04-28. Cost shown is per clinically effective daily dose, not per pill.
Vitex Berry Liquid Phyto-Caps, 60 Capsules
Gaia Herbs$28.99 ÷ 58 days at ~517mg/day (0.5 servings × 1000mg)
Best whole-herb format with strong sourcing transparency; pick this if you prefer Gaia's traditional preparation over a standardized extract
Prices checked 2026-04-28. Cost shown is per clinically effective daily dose, not per pill.
Chaste Berry Vitex Extract 300mg, 90 Veg Capsules
NOW Foods$16.49 ÷ 92 days at 300mg/day (1 serving × 300mg)
Good budget option but the dong quai inclusion takes it slightly outside the single-ingredient profile used in the published vitex trials
Prices checked 2026-04-28. Cost shown is per clinically effective daily dose, not per pill.
Vitex Chasteberry 400mg, 100 VegCaps
Solaray
$15.99 ÷ 100 days at 400mg/day (1 serving × 400mg)
Solid budget pick if you accept the standardization tradeoff; not interchangeable with Ze 440-style extracts on a milligram basis
Prices checked 2026-04-28. Cost shown is per clinically effective daily dose, not per pill.
Organic Vitex Chasteberry, 120 Capsules
Wholesome Story
$21.99 ÷ 110 days at ~546mg/day (0.5 servings × 1000mg)
Best organic whole-fruit option at a fair price; recognize that the milligram dose does not equate to standardized-extract milligrams
Prices checked 2026-04-28. Cost shown is per clinically effective daily dose, not per pill.
Full Comparison
| Category | Femaprin Vitex Extract with Vitamin B6, 60 Capsules Nature's Way | Chaste Tree (Vitex) 225mg, 120 Capsules Pure Encapsulations | Chaste Tree Berry Extract, 60 Capsules Vitanica | Vitex Berry Liquid Phyto-Caps, 60 Capsules Gaia Herbs | Chaste Berry Vitex Extract 300mg, 90 Veg Capsules NOW Foods | Vitex Chasteberry 400mg, 100 VegCaps Solaray | Organic Vitex Chasteberry, 120 Capsules Wholesome Story |
|---|---|---|---|---|---|---|---|
| Brand Score | 86/100Winner | 85/100 | 81/100 | 80/100 | 79/100 | 76/100 | 73/100 |
| Dosing & Form | 23/25Winner | 23/25 | 21/25 | 19/25 | 21/25 | 19/25 | 19/25 |
| Purity | 19/25 | 22/25Winner | 19/25 | 20/25 | 19/25 | 17/25 | 17/25 |
| Value | 22/25Winner | 17/25 | 18/25 | 18/25 | 22/25 | 22/25 | 21/25 |
| Transparency | 22/25 | 23/25Winner | 23/25 | 23/25 | 17/25 | 18/25 | 16/25 |
| Cost/Day | $0.30 | $0.40 | $0.45 | $0.50 | $0.18 | $0.16Winner | $0.20 |
| Dose/Serving | 40mg | 225mg | 225mg | 1000mg | 300mg | 400mg | 1000mg |
| Form | Standardized vitex agnus-castus fruit extract (40mg) + 5mg vitamin B6, vegetarian capsule | Vitex agnus-castus fruit extract (4:1 concentration), hypoallergenic vegetarian capsule | Vitex agnus-castus berry extract 225mg, vegetarian capsule | Liquid phyto-cap with vitex berry extract (dried herb equivalent) | Vitex agnus-castus fruit extract 300mg + 100mg dong quai root, vegetarian capsule | Whole vitex agnus-castus fruit (no standardization figure), vegan capsule | Organic vitex agnus-castus berry powder (whole fruit, no standardization) |
| Third-Party Tested | ✓ Yes | ✓ Yes | No | ✓ Yes | No | No | ✓ Yes |
| Proprietary Blend | No | No | No | No | No | No | No |
Frequently Asked Questions
How long until vitex works for PMS?
The clinical trials measured outcomes at 3 menstrual cycles, not at 1 week or 1 month. Most women who respond notice clearer improvement by cycle 2 or 3. If you have not seen any change by the end of cycle 3, the published trial design says it is reasonable to stop. Taking vitex for a few days around your period and judging it on that is not how it was studied.
Can I take vitex while breastfeeding?
No. Vitex acts on dopamine D2 receptors at the pituitary to reduce prolactin, and prolactin is the hormone that drives milk production. Lowering prolactin can lower milk supply, which is exactly the opposite of what a nursing mother wants. Wait until you have weaned before considering vitex.
Does vitex affect birth control pills?
We don't know with certainty, and that is the honest answer. There is no large interaction study of vitex with combined oral contraceptives, the patch, the ring, the implant, or hormonal IUDs. Theoretically, vitex's mild hormonal activity could interact, and case reports of breakthrough bleeding exist but are not conclusive. The conservative move is to talk to your clinician before combining them, especially if you are relying on the pill for contraception rather than only for cycle management.
What is Ze 440 and why does it matter?
Ze 440 is a specific standardized vitex extract made by Zeller in Switzerland, dosed at 20mg/day. It is the extract used in the Schellenberg 2001 BMJ trial and several follow-up studies, so when researchers and clinicians say 'vitex works for PMS' they often specifically mean Ze 440. BNO 1095 (Femicur, made by Bionorica in Germany) is a similarly well-studied extract. US OTC products often use generic vitex fruit powder or non-branded extracts, which may or may not match the active compound profile of Ze 440. Pick a product that documents standardization (to aucubin, agnusides, or a 0.5%+ active level) rather than one that just lists 'vitex fruit 400mg.'
Does vitex help PMDD or just regular PMS?
The strongest evidence is for PMS, the broader cluster of cyclical symptoms. Premenstrual dysphoric disorder (PMDD) is a more severe, more strictly defined diagnosis with prominent mood symptoms, and the trial picture for PMDD specifically is mixed. Some smaller trials show benefit, others do not, and the populations and outcome measures vary. If you have a confirmed PMDD diagnosis, vitex is not a substitute for evaluation by a clinician who can discuss SSRIs and other better-evidenced options for PMDD.
Can vitex help me get pregnant if I have a short luteal phase?
There is some early signal that vitex may lengthen short luteal phases in women with mildly elevated prolactin, which is biologically plausible from the dopamine mechanism. But the trials are small, the populations are mixed, and there is no quality evidence that vitex improves fertility in women without an identified hormonal issue. If you are trying to conceive and suspect a luteal phase defect or hyperprolactinemia, the right first step is lab work and a clinician's input, not self-prescribing vitex.
Is vitex safe for men?
There is essentially no evidence base for men using vitex, and the prolactin-lowering effect is not generally relevant to male health goals. Men with elevated prolactin from a pituitary cause should be evaluated by a clinician for the underlying problem rather than reaching for a women's health herb. Skip it if you are male.
Sources
- Schellenberg R. Treatment for the premenstrual syndrome with agnus castus fruit extract: prospective, randomised, placebo controlled study. BMJ. 2001;322(7279):134-7.
- He Z, Chen R, Zhou Y, et al. Treatment for premenstrual syndrome with Vitex agnus castus: A prospective, randomized, multi-center placebo controlled study in China. Maturitas. 2009;63(1):99-103.
- Berger D, Schaffner W, Schrader E, Meier B, Brattström A. Efficacy of Vitex agnus castus L. extract Ze 440 in patients with pre-menstrual syndrome (PMS). Arch Gynecol Obstet. 2000;264(3):150-3.
- Loch EG, Selle H, Boblitz N. Treatment of premenstrual syndrome with a phytopharmaceutical formulation containing Vitex agnus castus. J Womens Health Gend Based Med. 2000;9(3):315-20.
- Halaska M, Beles P, Gorkow C, Sieder C. Treatment of cyclical mastalgia with a solution containing a Vitex agnus castus extract: results of a placebo-controlled double-blind study. Breast. 1999;8(4):175-81.
- Wuttke W, Jarry H, Christoffel V, Spengler B, Seidlová-Wuttke D. Chaste tree (Vitex agnus-castus)--pharmacology and clinical indications. Phytomedicine. 2003;10(4):348-57.
- van Die MD, Burger HG, Teede HJ, Bone KM. Vitex agnus-castus extracts for female reproductive disorders: a systematic review of clinical trials. Planta Med. 2013;79(7):562-75.
- NIH National Center for Complementary and Integrative Health. Chasteberry overview.
FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. The products discussed on this page are not intended to diagnose, treat, cure, or prevent any disease. Always consult with a qualified healthcare professional before starting any supplement regimen.