Klean Athlete Klean Casein vs Optimum Nutrition Gold Standard 100% Casein
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Measured specs Bars scale to the largest value shown. “Not listed” = not confirmed on the label or listing.
What’s in it
- 24 g protein per scoop
- Micellar casein
- 24 g protein per scoop
- Micellar casein
Micellar casein with NSF sport certification.
The best-known casein, with many flavors.
Evidence note
Casein Protein: Casein is the slow-digesting milk protein. Many lifters take it before bed or between meals.
General information on the main ingredient, not a health claim about any product. These statements have not been evaluated by the FDA. Talk to your doctor before starting a supplement.
Winner by category
| Protein per serving | Tie |
|---|---|
| Sugar per serving | Klean Athlete Klean Casein |
| Third-party testing | Klean Athlete Klean Casein |
| Higher in our ranking | Klean Athlete Klean Casein (#1) |
“Winners” are only on confirmed numbers (higher is better, except sugar, footprint and price tier). They are not an overall verdict.
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
Talk to your doctor or pharmacist before starting any supplement, especially if you take medication, are pregnant or nursing, or have a medical condition.