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Head-to-head evidence comparison — which supplement is right for you?
Soy Isoflavones wins 2 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Mixed evidence
2 of 5 studies with measurable effects showed benefit.
Top outcomes
Verdict
Likely helps
11 of 13 studies with measurable effects showed benefit.
Top outcomes
Shared outcomes (1)
Outcomes where both Raspberry Leaf and Soy Isoflavones have evidence — compare verdict strength side-by-side.
1-2g dried leaf as tea, 2-3 times daily
Between meals as tea, Divided throughout the day
Dried leaf tea
40-80mg isoflavones daily
Divided doses with meals, Consistent daily timing
Standardized soy isoflavone extract
2-3 cycles
Last trimester
4-12 weeks
6-12 months
8-12 weeks
Initial use
Raspberry Leaves and Extracts-Molecular Mechanism of Action and Its Effectiveness on Human Cervical Ripening and the Induction of Labor
Nutrients (2023) · Systematic review
The majority of women apply raspberry leaves during pregnancy to induce and ease labor.
A Review on Berry Seeds-A Special Emphasis on Their Chemical Content and Health-Promoting Properties
Nutrients (2023) · Systematic review
Last search was conducted on 16.01.2023.
Phenolic Composition, Mineral Content, and Beneficial Bioactivities of Leaf Extracts from Black Currant (Ribes nigrum L.), Raspberry (Rubus idaeus), and Aronia (Aronia melanocarpa)
Nutrients (2020) · Systematic review
This was reviewed and discussed in this article.
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).
Based on single RCT (n=37) showing 25.6% glucose reduction when tea consumed with sucrose. Conservative estimate due to limited study population and single trial. Effect may be specific to tea preparation and timing with carbohydrate intake.
Meta-analysis of 533 participants showed effectiveness for menopausal symptoms. Effect size appears modest and heterogeneity was noted across studies. Individual response varies significantly.
AI-estimated from published studies. Interpret as directional guidance.
Soy Isoflavones has a higher evidence score (6/10 vs 4/10) and wins in 2 of 3 categories.
For support mood, Soy Isoflavones has a higher relevance score (80 vs 60).
No known interactions between Raspberry Leaf and Soy Isoflavones have been documented in our database. However, always consult a healthcare provider before combining supplements.