Other

Soy Protein

Common in plant-based protein powders, shakes, and bars.

Sci.Glycine max protein isolate fortified isolated soy protein fortified soy protein high isoflavone soy protein concentrate high isoflavone soy protein isolate hydrolized soy protein hydrolyzed soy protein hydrolyzed soy protein blend hydrolyzed vegetable (soy) protein ipp supro(r) non-gmo soy protein isolate isolated soy protein non-gmo isolated soy protein non-gmo soy protein isolate organic soy protein concentrate organic soy protein isolate protein blend solae(r) brand isolated soy protein solae soy protein isolate solae(tm) brand isolated soy protein soy bean protein extract soybean protein powder soy isolate soy peptide soy protein soy protein 90% soy protein concentrate soy protein crisps soy protein extract soy protein hydrolysate soy protein, hydrolysate soy protein, hydrolyzed soy protein isolate soy protein isolate 90% powder soy protein isolate powder soy protein isolates soy protein nuggets soy protein, powder soy protein proprietary blend soy proteins standardized soy (glycine max) seed protein isolate supro 661 soy protein isolate supro(r) brand soy protein supro(r) brand soy protein isolate supro(r) soy protein isolate supro soy protein isolate supro xt isolated soy protein textured soy protein SPI Isolated Soy Protein Soya Protein Isolate Soy Protein Isolate
4 forms

About Soy Protein

Soy protein isolate (SPI) is a highly refined, concentrated protein powder derived from defatted soybeans (Glycine max). It is produced by removing most non-protein components—including carbohydrates (sugars, fiber), fats, and moisture—through a series of aqueous extraction, precipitation, and drying processes. The resulting product is typically ≥90% protein by dry weight, making it one of the most concentrated plant-based protein sources available. It is a complete protein containing all nine essential amino acids, though it is relatively lower in methionine and cysteine compared to animal proteins like whey or casein. SPI exhibits excellent functional properties, including water and fat binding, emulsification, gelation, and foaming, which make it valuable in food manufacturing. It has a neutral flavor profile, which allows for versatile incorporation into products without strong beany tastes. Widely used in sports nutrition, meal replacements, infant formulas, functional foods, and dietary supplements for muscle support, weight management, and general protein fortification. Some studies suggest potential cardiovascular benefits through modest LDL cholesterol reduction when consumed as part of a balanced diet.

Dietary Supplement Label Database

Ingredient group data in NutriNav is aligned with the NIH Dietary Supplement Label Database (DSLD).

DSLD group id
2473

Compare All Forms

4 forms

Compare supplement forms of Soy Protein by absorption quality and what your body actually gets from each:

High Moderate Low
Form Absorption Steps to absorb Notes Action
Soy Protein — — — View →
Soy Protein Isolate

Common in plant-based protein powders, shakes, and bars.

  • CAS: 9010-10-0
  • Label category: Natural (Soy)
 — — — View →
Soy Protein Isolate (Non-Textured)

Complete plant protein; supports muscle health & cholesterol...

  • CAS: 9010-10-0
  • Label category: natural
 — — — View →
Soy Protein Isolate (Textured)

Complete plant protein; common meat alternative; often used...

  • CAS: 9010-10-0
  • Label category: natural
 — — — View →

Also appears on labels as

Additional names seen on supplement labels for forms of this ingredient (beyond the main aliases above).

Non-textured soy protein, Soy meat, Soy protein concentrate (high purity), Soy protein concentrate, textured, Soy protein powder, Textured vegetable protein (TVP) - soy-based, TSP

Type: Other

Miscellaneous ingredients including fillers, binders, preservatives, artificial colors, flavors, sweeteners, and other additives found in supplements.

Absorption: Many of these ingredients are inert fillers or additives that may affect absorption of active ingredients.

Interactions: Some additives may have health concerns. Fillers may reduce absorption of other nutrients. Preservatives and artificial colors may cause adverse reactions in sensitive individuals.

Potential Benefits

Benefits associated with Soy Protein forms:

Muscle Growth Bone Health Support Muscle Protein Synthesis Support Cholesterol Management Weight Management & Satiety Cardiovascular Health (Cholesterol Reduction)

And 4 more benefits...

Potential Side Effects

Side effects associated with Soy Protein forms:

Allergic Reaction How serious: Moderate Soy Allergy How serious: Moderate Gastrointestinal Discomfort How serious: low Hormonal Effects (Theoretical) How serious: low Mineral Absorption Interference How serious: low Thyroid Function Interference (Theoretical) How serious: low

And 1 more side effect...