Soy protein isolate: Nutrition Facts
Generic food Beans and Legumes
Soy protein isolate contains 335 kcal per 100 g. A typical serving of 1 oz (28.4 g) provides about 95 kcal.
Roughly 92% of its calories come from protein, with 8% from fat and 0% from carbohydrates (estimated with general energy factors).
That is more energy than the typical item in legumes and legume products on FoodFactly, where the median is 127 kcal per 100 g across 312 foods.
100 g provides 178% of the Daily Value for copper, 81% of the Daily Value for iron and 65% of the Daily Value for manganese.
The data comes from USDA FoodData Central: SR Legacy.
Nutrition facts
| Nutrient | Amount per 100 g | % DV |
|---|---|---|
| Calories C | 335 kcal | |
| Total fat ? | 3.4 g | 4% |
| Saturated fat ? | 0.42 g | 2% |
| Trans fat Z | 0 g | |
| Cholesterol ? | 0 mg | 0% |
| Sodium ? | 1,005 mg | 44% |
| Total carbohydrates C | 0 g | 0% |
| Dietary fiber Z | 0 g | 0% |
| Total sugars Z | 0 g | |
| Protein ? | 88.3 g | 177% |
| Vitamin A ? | 0 µg | 0% |
| Vitamin C ? | 0 mg | 0% |
| Vitamin D Z | 0 µg | 0% |
| Vitamin E Z | 0 mg | 0% |
| Vitamin K Z | 0 µg | 0% |
| Thiamin (B1) ? | 0.18 mg | 15% |
| Riboflavin (B2) ? | 0.1 mg | 8% |
| Niacin (B3) ? | 1.4 mg | 9% |
| Pantothenic acid (B5) ? | 0.06 mg | 1% |
| Vitamin B6 ? | 0.1 mg | 6% |
| Folate (B9) C | 176 µg | 44% |
| Vitamin B12 ? | 0 µg | 0% |
| Choline I | 191 mg | 35% |
| Calcium ? | 178 mg | 14% |
| Iron ? | 14.5 mg | 81% |
| Magnesium ? | 39 mg | 9% |
| Phosphorus ? | 776 mg | 62% |
| Potassium ? | 81 mg | 2% |
| Zinc ? | 4 mg | 37% |
| Copper ? | 1.6 mg | 178% |
| Manganese ? | 1.5 mg | 65% |
| Selenium C | 0.8 µg | 1% |
% DV: percent of the FDA Daily Value for adults (reference amounts). Letters show how each value was obtained: M measured, C calculated, L label, Z assumed zero, I imputed. Vitamins and minerals not listed were not reported by the source.
Nutritional breakdown
- Protein 92%
- Fat 8%
Approximate share of calories, using general energy factors (4 kcal/g protein and carbohydrate, 9 kcal/g fat, 7 kcal/g alcohol).
Vitamins and minerals, % Daily Value per 100 g
Nutritional insights
- Protein88.3 gin the top quarter of legumes and legume products (median 8.9 g)
- Fiber0 gin the lowest quarter of legumes and legume products (median 5.3 g)
- Sugars0 gin the lowest quarter of legumes and legume products (median 2.2 g)
- Fat3.4 gabove the median for legumes and legume products (median 1.4 g)
- Saturated fat0.42 gabove the median for legumes and legume products (median 0.21 g)
- Sodium1,005 mgin the top quarter of legumes and legume products (median 41 mg)
- Protein per 100 kcal26.4 gprotein density, useful for comparing foods with different calorie levels
- Water5 gwater per 100 g, which largely explains differences between raw, cooked and dried forms
Full nutrient profile
Fats and cholesterol (2)
| Monounsaturated fat ? | 0.65 g |
|---|---|
| Polyunsaturated fat ? | 1.6 g |
Amino acids (18)
| Tryptophan ? | 1.1 g |
|---|---|
| Threonine ? | 3.1 g |
| Isoleucine ? | 4.3 g |
| Leucine ? | 6.8 g |
| Lysine ? | 5.3 g |
| Methionine ? | 1.1 g |
| Cystine ? | 1 g |
| Phenylalanine ? | 4.6 g |
| Tyrosine ? | 3.2 g |
| Valine ? | 4.1 g |
| Arginine ? | 6.7 g |
| Histidine ? | 2.3 g |
| Alanine ? | 3.6 g |
| Aspartic acid ? | 10.2 g |
| Glutamic acid ? | 17.5 g |
| Glycine ? | 3.6 g |
| Proline ? | 5 g |
| Serine ? | 4.6 g |
Individual fatty acids (19)
| EPA (omega-3, 20:5 n-3) ? | 0 g |
|---|---|
| DHA (omega-3, 22:6 n-3) ? | 0 g |
| Linoleic acid (omega-6, 18:2) ? | 1.5 g |
| SFA 4:0 ? | 0 g |
| SFA 6:0 ? | 0 g |
| SFA 8:0 ? | 0 g |
| SFA 10:0 ? | 0 g |
| SFA 12:0 ? | 0 g |
| SFA 14:0 ? | 0.008 g |
| SFA 16:0 ? | 0.31 g |
| SFA 18:0 ? | 0.1 g |
| MUFA 18:1 ? | 0.64 g |
| PUFA 18:3 ? | 0.2 g |
| PUFA 20:4 ? | 0 g |
| MUFA 16:1 ? | 0.008 g |
| PUFA 18:4 ? | 0 g |
| MUFA 20:1 ? | 0 g |
| MUFA 22:1 ? | 0 g |
| PUFA 22:5 n-3 (DPA) ? | 0 g |
Carotenoids (7)
| Beta-carotene Z | 0 µg |
|---|---|
| Lycopene Z | 0 µg |
| Lutein + zeaxanthin Z | 0 µg |
| Retinol Z | 0 µg |
| Carotene, alpha Z | 0 µg |
| Vitamin D (D2 + D3), International Units Z | 0 IU |
| Cryptoxanthin, beta Z | 0 µg |
Other components (11)
| Water ? | 5 g |
|---|---|
| Alcohol ? | 0 g |
| Caffeine Z | 0 mg |
| Ash ? | 3.6 g |
| Theobromine Z | 0 mg |
| Energy C | 1,401 kJ |
| Vitamin A, IU ? | 0 IU |
| Folic acid Z | 0 µg |
| Folate, food ? | 176 µg |
| Vitamin E, added Z | 0 mg |
| Vitamin B-12, added Z | 0 µg |
Other forms of Soy protein isolate
Raw, cooked, dried and processed versions are separate records with their own measured values.
| Food | Calories | Protein | Carbs | Fat |
|---|---|---|---|---|
| Soy protein isolate, potassium type | 321 | 88.3 g | 2.6 g | 0.53 g |
Per 100 g. Calories in kcal. n/a: not reported by the source.
Foods with a similar nutritional profile
| Food | Calories | Protein | Carbs | Fat |
|---|---|---|---|---|
| Soy protein concentrate, produced by alcohol extraction | 328 | 63.6 g | 25.4 g | 0.46 g |
| Soy protein concentrate, produced by acid wash | 328 | 63.6 g | 25.4 g | 0.46 g |
| Soy meal, defatted, raw Raw | 337 | 49.2 g | 35.9 g | 2.4 g |
| Tofu, dried-frozen (koyadofu), prepared with calcium sulfate Dried or dry | 470 | 52.4 g | 8.3 g | 30.3 g |
| Tofu, dried-frozen (koyadofu) Dried or dry | 477 | 52.5 g | 10 g | 30.3 g |
| Peanut flour, defatted | 327 | 52.2 g | 34.7 g | 0.55 g |
| Soy flour, low-fat | 372 | 49.8 g | 30.6 g | 8.9 g |
| Soy flour, defatted | 327 | 51.5 g | 33.9 g | 1.2 g |
Per 100 g. Calories in kcal. n/a: not reported by the source.
Frequently asked questions
How many calories are in soy protein isolate?
100 g of soy protein isolate has 335 kcal. 1 oz (28.4 g): about 95 kcal.
Is soy protein isolate high in protein?
Soy protein isolate contains 88.3 g of protein per 100 g (177% of the 50 g Daily Value), or 25 g in 1 oz (28.4 g). About 92% of its calories come from protein. Compared with other legumes and legume products, that is among the highest quarter (median 8.9 g).
How many carbs are in soy protein isolate?
Soy protein isolate has 0 g of total carbohydrates per 100 g, including 0 g of fiber and 0 g of sugars.
How much fat is in soy protein isolate?
Soy protein isolate contains 3.4 g of fat per 100 g, of which 0.42 g is saturated (2% of the Daily Value).
What vitamins and minerals does soy protein isolate contain?
Per 100 g, the most notable amounts relative to the Daily Value are copper (178% DV), iron (81% DV), manganese (65% DV), phosphorus (62% DV) and Folate (B9) (44% DV). The full list is in the vitamins and minerals table above.
How much sodium is in soy protein isolate?
100 g contains 1,005 mg of sodium, 44% of the 2,300 mg Daily Value.
Where does this nutrition data come from?
From USDA FoodData Central: SR Legacy, record dated April 1, 2019. FoodFactly last checked it on November 6, 2026. Each value above shows whether it was measured, calculated or taken from a label.
Source of the nutrition information
- USDA FoodData Central: SR Legacy, record 174276. License: CC0 1.0 (U.S. public domain). Source record dated April 1, 2019. Imported November 6, 2026.
Last updated: . Data quality score: 100/100 (how it is calculated).
General nutrition information, not medical advice. Individual needs differ; see our disclaimer.