Klean Casein
Klean Athlete Klean Casein is a casein protein powder with 24 g of protein per 1 scoop (30.7 g). It scores 91/100 on the TBPP Quality Score. It is NSF Certified for Sport.
Nutrition per serving
Natural Vanilla Custard flavor, from the label.
| Serving size | 1 scoop (30.7 g) |
|---|---|
| Protein | 24 g |
| Calories | 110 |
| Carbohydrates | 2 g |
| Sugar | 1 g |
| Fat | Not verified |
| Sodium | 110 mg |
| Protein by weight | 78% |
| Leucine | 2.011 g |
| BCAAs | 4.36 g |
How it scored
91 of 100 points. How we score
| Criterion | Points | Why |
|---|---|---|
| Protein density | 22 / 30 | 78% of each scoop is protein |
| Third-party testing | 25 / 25 | Lot-tested for banned substances |
| Label transparency | 20 / 20 | Fully disclosed formula, no amino spiking |
| Sugar | 10 / 10 | 1 g sugar per serving |
| Ingredient simplicity | 10 / 10 | Natural flavors and sweeteners |
| Verified label data | 4 / 5 | 6 of 7 label values verified |
Formula and label
| Type | Casein |
|---|---|
| Protein sources | Micellar Casein |
| Third-party testing | NSF Certified for Sport |
| Sweeteners | Stevia Leaf Extract, Monk Fruit Extract |
| Proprietary blend | No |
| Added free amino acids | No |
| Dietary | Gluten-Free, Non-GMO |
| Allergens | Milk |
| Made by | Klean Athlete |
| Sold at | Not verified |
Price
We could not verify a current U.S. price.
Sizes: 21.6 oz (614 g, 20 servings, Vanilla Custard), 23.2 oz (658 g, Chocolate)
Flavors (2)
- Natural Vanilla Custard
- Natural Chocolate
Sources
- https://api.ods.od.nih.gov/dsld/v9/label/293258
- https://api.ods.od.nih.gov/dsld/v9/search-filter?q=klean%20casein&size=5
- https://www.nsfsport.com/certified-products/search-results.php?brand=Klean+Athlete
kleanathlete.com returned 403 on all fetches (2026-10-13), so no brand-site page could be read; official_url is the brand domain printed on the label. Nutrition (Natural Vanilla Custard: 30.7 g scoop, 20 servings, 110 kcal, 2 g carbs, 1 g sugar, 24 g protein, 110 mg sodium, 530 mg calcium, 20 mg cholesterol; ingredients micellar casein, natural flavors, salt, xanthan gum, stevia, monk fruit; Contains: milk; gluten-free, non-GMO; NSF Certified Sport seal) from NIH DSLD label record 293258 (on-market, entered 2023-10-24). Total fat not captured in that record, so null. NSF Certified for Sport confirmed on nsfsport.com for both Natural Chocolate and Natural Vanilla Custard. DSLD marks older Chocolate label versions off-market; NSF still lists Chocolate. bcaa_g = sum of labeled leucine 2011 + isoleucine 1068 + valine 1284 mg. Price and retailers not verified.
Good to know
Last checked 2026-10-13. Labels change, so check the package before buying if you have allergies. If you are pregnant, nursing or buying for a child, ask your doctor before adding a supplement.