Soy Protein Isolate
90.0gprotein / 100g375 cal · 1.0g fat · $$ · Quality 0.9
Whey Protein Concentrate (WPC)
78.0gprotein / 100g390 cal · 6.0g fat · $ · Quality 1.0
This isn't close. Soy Protein Isolate packs 90.0g of protein per 100g against Whey Protein Concentrate (WPC)'s 78.0g — a 12.0g gap driven mostly by how concentrated or diluted each food naturally is.
Whey Protein Concentrate (WPC) pulls ahead on protein quality specifically (highest DIAAS of any common protein source), even in categories where Soy Protein Isolate wins on raw grams.
Whey Protein Concentrate (WPC) is the more budget-friendly pick ($ vs $$ for Soy Protein Isolate), worth weighing if cost matters more than the other differences here.
If you're eating plant-based, this comparison is moot — Soy Protein Isolate fits, Whey Protein Concentrate (WPC) 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 Concentrate (WPC) otherwise — the protein numbers are close enough that diet compatibility should lead.
Full nutrition comparison
| Per 100g | Soy Protein Isolate | Whey Protein Concentrate (WPC) |
|---|---|---|
| Protein | 90.0g | 78.0g |
| Calories | 375 | 390 |
| Fat | 1.0g | 6.0g |
| Carbs | 2.0g | 8.0g |
| 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 concentrate (wpc)?
Soy Protein Isolate has 90.0g of protein per 100g compared to Whey Protein Concentrate (WPC)'s 78.0g.
Which is lower in calories?
Soy Protein Isolate is lower in calories per 100g, at 375 vs the other's 390.