Whey and whey isolate comparison
Thorne Whey Protein Isolate vs Momentous Grass-Fed Whey Protein Isolate
Thorne Whey Isolate scores higher on our standard, 82/100 to 79/100. It earns more points for sugar (2 g vs not verified) and verified label data (7 vs 3 of 7 label values), while Momentous Whey Isolate earns more for label transparency (fully disclosed vs proprietary blend). Per 25 g of protein, Thorne Whey Isolate costs $2.58 and Momentous Whey Isolate $3.50.
Both are scored out of 100 against our published standard: protein density, third-party testing, label transparency, sugar, ingredient simplicity and verified label data. Every number below is from the manufacturer's label; last checked 2026-10-13.
Thorne
Whey Protein Isolate
Momentous
Grass-Fed Whey Protein Isolate (formerly Essential Grass-Fed Whey)
Side by side
Per serving, from each label. Bold marks the better score, protein density, sugar and cost where the two differ. How we score
| Compared | Thorne Whey Isolate | Momentous Whey Isolate |
|---|---|---|
| Our score | 82/100 (better) | 79/100 |
| Protein density | 22 / 3070% of each scoop is protein | 22 / 3076% of each scoop is protein |
| Third-party testing | 25 / 25Lot-tested for banned substances | 25 / 25Lot-tested for banned substances |
| Label transparency | 10 / 20uses a proprietary blend | 20 / 20 (better)Fully disclosed formula, no amino spiking |
| Sugar | 10 / 10 (better)2 g sugar per serving | 0 / 10Sugar not verified |
| Ingredient simplicity | 10 / 10Natural flavors and sweeteners | 10 / 10Natural flavors and sweeteners |
| Verified label data | 5 / 5 (better)7 of 7 label values verified | 2 / 53 of 7 label values verified |
| Type | Whey Isolate | Whey Isolate |
| Protein per serving | 21 g | 20 g |
| Serving size | 1 scoop (30.2 g) | 1 scoop (26.4 g) |
| Protein by weight | 70% | 76% (better) |
| Sugar | 2 g | Not verified |
| Calories | 100 | 90 |
| Cost per 25 g protein | $2.58 (better) | $3.50 |
| Price per serving | $2.17 | $2.80 |
| Third-party certifications | NSF Certified for Sport | NSF Certified for Sport |
| Sweeteners | Evaporated Cane Juice Sugar, Rebaudioside A (Stevia) | Monk Fruit Extract, Stevia |
| Allergens | Milk | Milk |
| Proprietary blend | Yes | No |
| Added free amino acids (amino spiking) | No | No |
| Last checked | 2026-10-13 | 2026-10-13 |
Which to choose
Only the differences in our records. A value we couldn't verify never counts as a difference.
Choose Thorne Whey Isolate if…
- You want to pay less per 25 g of protein ($2.58 vs $3.50).
- You want a powder the brand labels soy-free (our record for Momentous Whey Isolate has no such label).
Choose Momentous Whey Isolate if…
- You want more of each scoop to be protein (76% vs 70% by weight).
- You want a fully disclosed formula (Thorne Whey Isolate uses a proprietary blend).
- You want a powder the brand labels grass-fed (our record for Thorne Whey Isolate has no such label).
- You want more flavors to choose from (8 vs 2).
The two powders
Good to know
Labels and prices change, so check the package before buying, especially if you have allergies. If you are pregnant, nursing, buying for a child or managing a health condition, ask your doctor before adding a supplement.