Soy Protein Does Not Reduce Testosterone

Jinzang

Member
The study conducted in UK involved 200 men with type 2 diabetes mellitus with a total
testosterone level less than 12 nmol/L. Subjects took 15 grams of soy protein with 66 mg
of isoflavones or without any isoflavones daily for three months.

As a result, soy protein with or without isoflavones does not affect either total
testosterone or absolute free testosterone levels in the men with diabetes mellitus.
Soy protein with isoflavones increases thyroid-stimulating hormone (HSH) and reduces
free thyroxine (FT4), which means that the supplement improves thyroid function in the
subjects.

Low levels of HSH and high levels of FT4 indicate subclinical or clinical hypothyroidism,
which can worsen the diabetic condition. For instance, diabetics with hypothyroidism
may need more insulin for glycaemia control. The study results indicate soy protein
with isoflavones may improve hypothyroidism and help diabetes mellitus.

Additionally, the supplementation with soy protein with isoflavones significantly
reduces HbA1c and HOMA-IR and triglycerides, CRP and diastolic blood pressure, compared
to supplementation with soy protein alone. The results hint that the supplement with
both soy protein and isoflavones helps diabetes mellitus and reduces cardiovascular risk.

Link to the article

Link to the study
 

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A form of estrogen produced from testosterone. Important for bone health, mood, and libido. Too high can cause side effects; too low can affect well-being.

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The biologically active form of testosterone not bound to proteins. Directly available for cellular uptake and biological effects.

Scientific Reference

Lakshman KM, Kaplan B, Travison TG, Basaria S, Knapp PE, Singh AB, LaValley MP, Mazer NA, Bhasin S. The effects of injected testosterone dose and age on the conversion of testosterone to estradiol and dihydrotestosterone in young and older men. J Clin Endocrinol Metab. 2010 Aug;95(8):3955-64.

DOI: 10.1210/jc.2010-0102 | PMID: 20534765 | PMCID: PMC2913038

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