Casein comparison
Klean Athlete Klean Casein vs Ascent Micellar Casein
Klean Casein scores higher on our standard, 91/100 to 84/100. It earns more points for protein density (78% vs 69% protein by weight), while Ascent Casein earns more for verified label data (7 vs 6 of 7 label values). We could not verify a current price for Klean Casein, so we can't compare cost.
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 2026-10-14.
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 | Klean Casein | Ascent Casein |
|---|---|---|
| Our score | 91/100 (better) | 84/100 |
| Protein density | 22 / 30 (better)78% of each scoop is protein | 14 / 3069% of each scoop is protein |
| Third-party testing | 25 / 25Lot-tested for banned substances | 25 / 25Lot-tested for banned substances |
| Label transparency | 20 / 20Fully disclosed formula, no amino spiking | 20 / 20Fully disclosed formula, no amino spiking |
| Sugar | 10 / 101 g sugar per serving | 10 / 101 g sugar per serving |
| Ingredient simplicity | 10 / 10Natural flavors and sweeteners | 10 / 10Natural flavors and sweeteners |
| Verified label data | 4 / 56 of 7 label values verified | 5 / 5 (better)7 of 7 label values verified |
| Type | Casein | Casein |
| Protein per serving | 24 g | 25 g |
| Serving size | 1 scoop (30.7 g) | 1 scoop (36 g) |
| Protein by weight | 78% (better) | 69% |
| Sugar | 1 g | 1 g |
| Calories | 110 | 120 |
| Cost per 25 g protein | Not verified | $1.80 |
| Price per serving | Not verified | $1.80 |
| Third-party certifications | NSF Certified for Sport | Informed Sport |
| Sweeteners | Stevia Leaf Extract, Monk Fruit Extract | Stevia Leaf Extract |
| Allergens | Milk | Milk |
| Proprietary blend | No | No |
| Added free amino acids (amino spiking) | No | No |
| Last checked | 2026-10-13 | 2026-10-14 |
Which to choose
Only the differences in our records. A value we couldn't verify never counts as a difference.
Choose Klean Casein if…
- You want more of each scoop to be protein (78% vs 69% by weight).
- You want a powder the brand labels non-gmo (our record for Ascent Casein has no such label).
Choose Ascent Casein if…
- You want a powder the brand labels soy-free (our record for Klean Casein has no such label).
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.