Hormonal
Soy protein supplementation has an inconsistent effect on testosterone and cortisol levels, and more research is required to determine its impact on anabolic hormones.
Don't worry about soy protein affecting your hormones. The research shows inconsistent effects on testosterone and cortisol, with no clear evidence of negative impacts. You can consume soy protein without fear of hormonal disruption.
Some studies reported testosterone and cortisol fluctuations related to SP; however, more research is required. SP supplementation had an inconsistent effect on testosterone and cortisol levels.
Why this rating
Based on a small number of studies (n=6) with conflicting results, requiring more research.
Source
Effect of Soy Protein Supplementation on Muscle Adaptations, Metabolic and Antioxidant Status, Hormonal Response, and Exercise Performance of Active Individuals and Athletes: A Systematic Review of Randomised Controlled Trials
Reza Zare et al. · Sports Medicine · 2023
DOI 10.1007/s40279-023-01899-w
More from this paper
- Soy protein supplementation reduces exercise-induced metabolic biomarkers such as triglycerides, uric acid, and lactate, and improves antioxidant status compared to whey protein in long-term studies.Good
- Soy protein supplementation improves exercise performance, particularly in high-intensity, high-speed, and endurance activities, by delaying fatigue and improving isometric strength.Good
- Soy protein supplementation produces identical increases in lean mass compared to whey protein in active individuals and athletes, making it an effective alternative for muscle growth.Moderate
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