| Measure | Soy protein isolate | Whey protein isolate |
|---|---|---|
| Typical serving | 1 oz (28 g) | 1 scoop (28.7 g) |
| Protein per serving | 24.7 g | 16.7 g |
| Protein per 100 g | 88.3 g | 58.1 g |
| Calories per serving | 94 kcal | 103 kcal |
| Protein density | 105% of calories | 65% of calories |
| Share of 50 g Daily Value | 49% | 33% |
| Protein quality | Complete | Complete |
| Category | Protein supplements | Protein supplements |
Compare foods · Soy protein isolate · Whey protein isolate
Protein comparison
Soy protein isolate vs Whey protein isolate: which has more protein?
Soy protein isolate gives you 24.7 g of protein per 1 oz; whey protein isolate gives you 16.7 g per 1 scoop. On equal weight it is 88.3 g against 58.1 g per 100 g. The full side-by-side, from the same USDA-sourced records as the rest of the site:
The verdict
Soy protein isolate has more protein on equal weight: 88.3 g per 100 g against whey protein isolate's 58.1 g, a lead of 30.2 g. Per typical serving, soy protein isolate delivers 24.7 g (1 oz) to whey protein isolate's 16.7 g (1 scoop), a difference of 8 g.
For the full breakdown of each food, see the protein in soy protein isolate and protein in whey protein isolate pages, each with its USDA FoodData Central record id.
Quick answers
Soy protein isolate vs Whey protein isolate FAQ
Which has more protein, soy protein isolate or whey protein isolate?
Soy protein isolate has more protein per 100 g: 88.3 g against 58.1 g. Per typical serving, soy protein isolate provides 24.7 g (1 oz) and whey protein isolate provides 16.7 g (1 scoop).
Is soy protein isolate or whey protein isolate more protein-dense?
Soy protein isolate is the more protein-dense of the two: about 105% of its calories come from protein, against 65% for whey protein isolate.
Are soy protein isolate and whey protein isolate complete proteins?
Yes, both. Soy protein isolate and whey protein isolate each supply all nine essential amino acids in adequate amounts, so either can carry a meal's protein on its own.
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