Soy Protein Isolate Nutrition Facts

FoodData Central Updated 6 April 2026

Soy Protein Isolate contains 93.8 calories, 24.7g protein, 0g carbs, and 0.9g fat. Soy Protein Isolate is a plant-based protein source. It is high in protein and a good source of iron.

93.8

cal

0g

carbs

24.7g

protein

amino acids ↓

0.9g

fat

0g

fiber

0g

sugar

Vitamins in Soy Protein Isolate

Per Oz ~28g

Vitamin B6
0.03mg
2%
Thiamin (B1)
0.05mg
4%
Folate
49.3mcg
12%

Minerals in Soy Protein Isolate

Per Oz ~28g

Calcium
49.8mg
4%
Iron
4.06mg
23%
Magnesium
10.9mg
3%
Phosphorus
217mg
17%
Potassium
22.7mg
<1%
Sodium
281mg
12%
Zinc
1.13mg
10%
Selenium
0.22mcg
<1%
Copper
0.45mg
50%
Manganese
0.42mg
18%

Amino Acids in Soy Protein Isolate

Protein breakdown per oz (28g), from the USDA record for this food.

Complete protein

Soy Protein Isolate supplies all nine essential amino acids at or above the FAO/WHO adult reference pattern.

Essential Amino Acids Per oz (28g) Per 100g % of Protein
Histidine 645mg 2303mg 2.6%
Isoleucine 1191mg 4253mg 4.8%
Leucine 1899mg 6783mg 7.7%
Lysine 1492mg 5327mg 6%
Methionine 316mg 1130mg 1.3%
Phenylalanine 1286mg 4593mg 5.2%
Threonine 878mg 3137mg 3.6%
Tryptophan 312mg 1116mg 1.3%
Valine 1147mg 4098mg 4.6%
Other Amino Acids Per oz (28g) Per 100g % of Protein
Alanine 1005mg 3589mg 4.1%
Arginine 1868mg 6670mg 7.6%
Aspartic Acid 2857mg 10203mg 11.6%
Cystine 293mg 1046mg 1.2%
Glutamic Acid 4887mg 17452mg 19.8%
Glycine 1009mg 3603mg 4.1%
Proline 1389mg 4960mg 5.6%
Serine 1286mg 4593mg 5.2%
Tyrosine 902mg 3222mg 3.6%

Protein quality is scored against the FAO/WHO/UNU 2007 adult indispensable amino acid reference pattern. The FDA publishes no Daily Values for individual amino acids, so the share of total protein is shown instead.

Learn More About Soy Protein Isolate

Similar Foods

Compare Soy Protein Isolate with other plant-based proteins.

Verified Nutrition Data

Trusted & Verified Nutritional Information

All nutritional data on Food Index is sourced from official U.S. government databases and verified by nutrition experts at leading federal agencies.

USDA Official Source
FDA Safety Standards
HHS Health Standards
NIH Research Verified

Laboratory Analyzed

Nutrient values from certified lab analysis

Peer Reviewed

Data reviewed by nutrition scientists

Regularly Updated

Synced with latest official database releases

Nutritional values are based on standard reference data and may vary slightly based on preparation methods, brands, and natural variation in foods. Always consult with a healthcare professional for personalized dietary advice.