Protein
Soy
Soy is the soybean, Glycine max, a legume eaten as tofu, soy milk and other foods. It supplies protein and contains isoflavones.
What it is studied for
The strongest rated effects first. Bars show the size of the effect, the letter grades the evidence, and each rating lists the studies behind it.
All 10 rated effectsGrouped by health goal, with the publications behind each rating
Key studies
The most recent publications linked to Soy's ratings.
Effect of soy products and isoflavones on oxidative stress parameters: A systematic review and meta-analysis of randomized controlled trials.2020The Antioxidant Role of Soy and Soy Foods in Human Health2020Beyond the Cholesterol-Lowering Effect of Soy Protein: A Review of the Effects of Dietary Soy and Its Constituents on Risk Factors for Cardiovascular Disease2017The Short-Term Effects of Soybean Intake on Oxidative and Carbonyl Stress in Men and Women2013Soy isoflavones lower serum total and LDL cholesterol in humans: a meta-analysis of 11 randomized controlled trials.2007
All 6 studiesEvery publication linked to SoyWhy people take it
Essential Health19.8%
Immune Support13.5%
Women's Hormones11.9%
Longevity10.3%
Bone & Joint9.5%
Energy7.1%
SuppCo community snapshot, 2026-09-28. Reasons for use are not evidence that it works.
Soy Isoflavones
Soy Protein