Soy Protein
Soy protein is the protein of the soybean, sold as isolates and powders. It is a different component from the isoflavones found in the same bean.
Also listed as Soy Protein Isolate, Soy Protein Powder, Soya Protein, Soya Protein Isolate
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.
What are you getting from soy protein?
Soy foods and supplements can supply protein, while separate products concentrate isoflavones. These are different components of the same bean. NCCIH finds that replacing other proteins with soy protein can lower cholesterol slightly; isolated isoflavones may not have the same effect. 1
Key studies
The most recent publications linked to Soy Protein's ratings.
Why people take it
SuppCo community snapshot, 2026-09-28. Reasons for use are not evidence that it works.
Questions people ask
Is soy protein the same as soy isoflavones?
No. They are different soy components, and cholesterol findings do not transfer automatically from protein to isoflavone tablets. 2
Is it better than milk protein for muscle?
The cited review found no average difference in muscle-mass outcomes between soy and milk protein, rather than soy superiority. 3
Does 25 g mean 25 g of powder?
No. The cholesterol trials report soy protein itself. A powder’s total weight can include other ingredients. 4 5
Can food replace a soy protein shake?
Tofu and soy beverages can supply soy protein too; Health Canada includes both as examples in its cholesterol-claim assessment. 5
Soy
Pea Protein
Protein
Whey Protein