Klean Athlete
Klean Isolate, Unflavored
A two-ingredient whey protein isolate carrying the NSF Certified for Sport mark, so every batch is screened for banned substances and contaminants before it ships.
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Why We Love It
What makes Klean Isolate, Unflavored a Label Lookout pick
Most whey isolates market themselves as clean and then list a page of gums, flavors, and sweeteners. Klean Isolate's ingredient panel is two lines: whey protein isolate and sunflower lecithin, the second one there only to help the powder mix into liquid. NSF Certified for Sport means an outside lab checks each batch against a list of banned substances and common contaminants, the same standard we look for across every protein powder in this cluster.
Clean Ingredient Profile
No artificial colors, flavors, or questionable preservatives. Klean Athlete keeps it simple and transparent.
Meets Our Standards
Key qualities: NSF Certified for Sport, Gluten-Free, Non-GMO, No Artificial Sweeteners or Flavors. Each claim verified through our ingredient analysis process.
Third-Party Certified
Backed by independent certifications: NSF Certified for Sport. These aren't marketing claims — they're verified standards.
Full Ingredient List
What's inside
Whey protein isolate (from milk), sunflower lecithin.
Common Questions
Frequently asked
Does Klean Isolate contain any added sugar or artificial sweeteners?
No. It is unflavored and unsweetened, with 1 gram of naturally occurring sugar per scoop from the whey itself.
What does NSF Certified for Sport mean?
An independent lab tests every batch for banned substances, contaminants, and label accuracy before it ships, the same screening used in professional and Olympic athlete testing programs.
Is Klean Isolate gluten-free and non-GMO?
Yes, both are stated on the label alongside the ingredient panel.
How much protein is in one scoop?
20 grams of protein and 85 calories per 22.3-gram scoop, with the full amino acid breakdown published on the label.
Does it contain dairy?
Yes. Whey protein isolate comes from milk, so it is not suitable for anyone avoiding dairy.
Verified Certifications
Ready to make the switch?
Every swap counts. Klean Isolate, Unflavored is a cleaner choice you can feel good about — backed by our ingredient-level analysis.
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The Verdict
Pros & cons
What we love
- Two-ingredient label: whey protein isolate and sunflower lecithin, nothing else
- NSF Certified for Sport, so an outside lab screens every batch for banned substances and contaminants
- Unflavored and unsweetened, so it does not change the taste of a smoothie or recipe
- 20 grams of protein and only 1 gram of sugar per scoop
!Worth noting
- Whey protein isolate is dairy-derived, so it is not an option for anyone avoiding milk
- Only the unflavored version is single-ingredient; the vanilla and chocolate versions add other ingredients not evaluated here
Complete the swap
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Label Lookout Approved
Klean Isolate, Unflavored by Klean Athlete meets our strict standards for ingredient transparency and quality. Every recommendation is earned, never paid for.
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