Cited by 115Phytoestrogen effects and researchEstrogen and related hormone effectsHormonal and reproductive studies

Clinical studies show no effects of soy protein or isoflavones on reproductive hormones in men: Results of a meta-analysis

Open access
Hamilton-Reeves, Jill M., Vazquez, Gabriela, Duval, Sue J., Phipps, William R., Kurzer, Mindy S., Messina, Mark J.·2010·Fertility and Sterility

Abstract

Objective To determine whether isoflavones exert estrogen-like effects in men by lowering bioavailable T through evaluation of the effects of soy protein or isoflavone intake on T, sex hormone-binding globulin (SHBG), free T, and free androgen index (FAI) in men.Design PubMed and CAB Abstracts databases were searched through July 1, 2008, with use of controlled vocabulary specific to the databases, such as soy, isoflavones, genistein, phytoestrogens, red clover, androgen, testosterone, and SHBG. Peer-reviewed studies published in English were selected if [1] adult men consumed soy foods, isolated soy protein, or isoflavone extracts (from soy or red clover) and [2] circulating T, SHBG, free T, or calculated FAI was assessed. Data were extracted by two independent reviewers. Isoflavone exposure was abstracted directly from studies.Main outcome measure(s) Fifteen placebo-controlled treatment groups with baseline and ending measures were analyzed. In addition, 32 reports involving 36 treatment groups were assessed in simpler models to ascertain the results.Result(s) No significant effects of soy protein or isoflavone intake on T, SHBG, free T, or FAI were detected regardless of statistical model.Conclusion(s) The results of this meta-analysis suggest that neither soy foods nor isoflavone supplements alter measures of bioavailable T concentrations in men.

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Crossref · 10.1016/j.fertnstert.2009.04.038

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  • A meta-analysis of 15 placebo-controlled studies of men of varying ages reported that soy protein intake up to 60 g/day has not been associated with significant alterations in testosterone, sex hormone-binding globulin, free testosterone, or free androgen index.

    “A meta-analysis of 15 placebo-controlled studies of men of varying ages have reported that soy protein intake up to 60 g/day has not been associated with significant alterations in testosterone, sex hormone-binding globulin, free testosterone, or free androgen index [136].”

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Authors
Hamilton-Reeves, J. M., Vazquez, G., Duval, S. J., Phipps, W. R., Kurzer, M. S., & Messina, M. J.
Affiliations
  • University of Minnesota (US)
  • University of Rochester Medicine (US)
  • Loma Linda University (US)
Venue
Fertility and Sterility
Publisher
Elsevier BV
Published
2010-08
Volume
94
Issue
3
Pages
997-1007
ISSN
0015-0282 (ISSN-L)
OpenAlex
W1971875705
Cited by
115
References
74
Citations by year
2026: 1 · 2025: 7 · 2024: 4 · 2023: 4 · 2022: 8 · 2021: 10 · 2020: 12 · 2019: 5 · 2018: 7 · 2017: 4 · 2016: 12 · 2015: 3 · 2014: 4 · 2013: 17 · 2012: 5
FWCI
0.67
Type
journal article
Language
en
Open access
Locations
  • Fertility and Sterility (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Pathology and Forensic Medicine › Phytoestrogen effects and research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Estrogen and related hormone effects
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Hormonal and reproductive studies
Keywords
soy protein, isoflavones, phytoestrogens, genistein, red clover, testosterone, sex hormone-binding globulin, free testosterone, free androgen index, bioavailable testosterone, men, reproductive hormones, dietary supplementation
MeSH terms
Adult, Algorithms, Clinical Trials as Topic, Humans, Isoflavones, Male, Reproduction, Sex Factors, Treatment Outcome, Soybean Proteins, Gonadal Hormones

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