Soy Protein Isolate
90.0gprotein / 100g375 cal · 1.0g fat · $$ · Quality 0.9
Whey Protein Hydrolysate (WPH)
85.0gprotein / 100g380 cal · 1.5g fat · $$$$ · Quality 1.0
Soy Protein Isolate delivers a clearly higher protein density than Whey Protein Hydrolysate (WPH) — 90.0g vs 85.0g per 100g, a gap of 5.0g that adds up fast across multiple servings.
Whey Protein Hydrolysate (WPH) pulls ahead on protein quality specifically (highest DIAAS, pre-digested for faster absorption), even in categories where Soy Protein Isolate wins on raw grams.
Soy Protein Isolate is also the cheaper option ($$ vs $$$$), which matters if you're eating either one regularly rather than occasionally.
If you're eating plant-based, this comparison is moot — Soy Protein Isolate fits, Whey Protein Hydrolysate (WPH) doesn't.
The real deciding factor is dietary fit, not macros: choose Soy Protein Isolate if you need it to be plant-based, choose Whey Protein Hydrolysate (WPH) otherwise — the protein numbers are close enough that diet compatibility should lead.
Full nutrition comparison
| Per 100g | Soy Protein Isolate | Whey Protein Hydrolysate (WPH) |
|---|---|---|
| Protein | 90.0g | 85.0g |
| Calories | 375 | 380 |
| Fat | 1.0g | 1.5g |
| Carbs | 2.0g | 2.0g |
| Fiber | 1.5g | 0.0g |
| Quality score | 0.9 | 1.0 |
| Relative cost | $$ | $$$$ |
| Prep time | 1 min | 1 min |
Frequently asked
Which has more protein, soy protein isolate or whey protein hydrolysate (wph)?
Soy Protein Isolate has 90.0g of protein per 100g compared to Whey Protein Hydrolysate (WPH)'s 85.0g.
Which is lower in calories?
Soy Protein Isolate is lower in calories per 100g, at 375 vs the other's 380.