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Head-to-head evidence comparison — which supplement is right for you?
Vitex wins 2 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Likely helps
11 of 13 studies with measurable effects showed benefit.
Top outcomes
Verdict
Likely helps
12 of 13 studies with measurable effects showed benefit.
Top outcomes
Shared outcomes (2)
Outcomes where both Soy Isoflavones and Vitex have evidence — compare verdict strength side-by-side.
40-80mg isoflavones daily
Divided doses with meals, Consistent daily timing
Standardized soy isoflavone extract
20-40mg extract (standardized to 0.5% agnuside)
Morning, Consistently at same time daily
Standardized extract (0.5% agnuside or 0.6% aucubin)
4-12 weeks
6-12 months
8-12 weeks
Initial use
1-3 cycles
2-3 cycles
1-2 cycles
Soy isoflavones prevent bone resorption and loss, a systematic review and meta-analysis of randomized controlled trials
Critical reviews in food science and nutrition (2020) · Meta analysis · n=5313
Soy isoflavones prevent osteoporosis-related bone loss in any weight status or treatment duration.
Effect of Soy Isoflavones on Measures of Estrogenicity: A Systematic Review and Meta-Analysis of Randomized Controlled Trials
Advances in nutrition (Bethesda, Md.) (2025) · Meta analysis · n=3285
Addressing public health concerns may promote soy foods as high-quality plant protein sources with low environmental impact and cost, particularly benefiting postmenopausal women and aligning with sustainable dietary patterns and guidelines.
Effects of soy isoflavones on menopausal symptoms in perimenopausal women: a systematic review and meta-analysis
PeerJ (2025) · Meta analysis · n=533
In October 2024, we screened 2,099 articles, of which 12 were eligible for meta-analysis, and found that soy isoflavones were effective for treating menopausal symptoms (seven studies, 533 participants, Hedges' g = -0.25, 95% CI [-0.42 to -0.08], p = 0.00).
Vitex agnus-castus in premenstrual syndrome: A meta-analysis of double-blind randomised controlled trials
Complementary Therapies in Medicine (2019) · Meta analysis · n=1878
Vitex significantly reduced overall PMS symptom scores vs placebo
Herbal medicine for depression and anxiety: A systematic review with assessment of potential psycho-oncologic relevance
Phytotherapy research : PTR (2018) · Systematic review
Overall, 45% of studies reported positive findings with fewer adverse effects compared with conventional medications.
A Critical Approach to Evaluating Clinical Efficacy, Adverse Events and Drug Interactions of Herbal Remedies
Phytotherapy research : PTR (2016) · Review
A critical evaluation of the clinical data regarding the adverse effects has shown that herbal remedies are generally better tolerated than synthetic medications.
Meta-analysis of 533 participants showed effectiveness for menopausal symptoms. Effect size appears modest and heterogeneity was noted across studies. Individual response varies significantly.
Based on meta-analysis of RCTs showing large effect size. Most effective for irritability, mood swings, and breast tenderness. Standardized extracts (Ze 440, BNO 1095) had strongest evidence. High heterogeneity noted between studies.
AI-estimated from published studies. Interpret as directional guidance.
Vitex has a higher evidence score (7/10 vs 6/10) and wins in 2 of 3 categories.
For testosterone & cortisol balance, Vitex has a higher relevance score (92 vs 60).
No known interactions between Soy Isoflavones and Vitex have been documented in our database. However, always consult a healthcare provider before combining supplements.