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Head-to-head evidence comparison — which supplement is right for you?
Resistant Starch wins 2 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Likely helps
17 of 19 studies with measurable effects showed benefit.
Top outcomes
Verdict
Likely helps
9 of 11 studies with measurable effects showed benefit.
Top outcomes
15-30g daily
With meals, Divide throughout day for higher doses
Raw potato starch (unmodified) or green banana flour
40-80mg isoflavones daily
Divided doses with meals, Consistent daily timing
Standardized soy isoflavone extract
2-4 weeks
4-8 weeks
1-2 weeks
First 1-2 weeks
4-12 weeks
6-12 months
8-12 weeks
Initial use
Metabolic Effects of Resistant Starch Type 2: A Systematic Literature Review and Meta-Analysis of Randomized Controlled Trials
Nutrients (2019) · Meta analysis · n=670
However, these outcomes were heavily influenced by positive results from a small number of individual studies which contradicted the conclusions of the majority of trials.
Acute Effects of Dietary Fiber in Starchy Foods on Glycemic and Insulinemic Responses: A Systematic Review of Randomized Controlled Crossover Trials
Nutrients (2023) · Systematic review
Data on insoluble DF and glucose metabolism are scarce.
The Effects of Resistant Starch on Biomarkers of Inflammation and Oxidative Stress: A Systematic Review and Meta-Analysis
Nutrition and cancer (2022) · Meta analysis · n=739
We used from the effect size, as estimated by the standardized mean difference (SMD) with 95% confidence intervals (95%CI) to perform the random method meta-analysis, with P value ≦0.05 as statistically significant.
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).
Meta-analysis showed modest 3.32 mg/dL reduction in fasting glucose. Effects were heavily influenced by small number of positive studies, with majority showing mixed results. Higher doses increase GI side effects.
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.
Resistant Starch has a higher evidence score (9/10 vs 9/10) and wins in 2 of 3 categories.
For reduce inflammation, Resistant Starch has a higher relevance score (85 vs 60).
No known interactions between Resistant Starch and Soy Isoflavones have been documented in our database. However, always consult a healthcare provider before combining supplements.