L-Leucine
Scored by the Formulate Research Team · Last reviewed July 2026
Score Breakdown
Three factors carry this score; three more are checked separately and can only take points away. Hover or tap to see what drove each one.
Ingredients per Serving
| Ingredient | Amount |
|---|---|
| L-Leucine, Fermented | 3000 mg |
Certifications & Testing
Recommended Use
Suggested Use: Add 1 scoop (3 grams) to your favorite beverage 1-2 times daily, or as directed by a physician. Mix for 15 to 20 seconds using a shaker cup or mix thoroughly with a spoon. May not mix very easily.
Warnings
Warning: Warning: Keep out of reach of children. Not for use by individuals under the age of 18 years. Do not use if pregnant or nursing. Consult a physician before use if you have a medical condition or are taking any medication. Discontinue use two weeks prior to surgery. Processed in a facility and /or manufacturing line that also produces milk, tree nuts, nuts and soy.
Frequently Asked Questions
What is NutraBio L-Leucine's Formulate score?
NutraBio L-Leucine scores 90 out of 100 (grade A) on Formulate's ingredient-level rubric: clinical evidence, dose accuracy and bioavailability carry the score, while manufacturing, transparency and safety are checked separately and can only deduct.
Is NutraBio L-Leucine worth it?
NutraBio L-Leucine scores 90/100 (grade A). That puts it in Formulate's top tier: its ingredient doses, forms, and label transparency hold up against the clinical evidence, and it carries credible third-party testing. Formulate grades every product with the same automated rubric, so the score reflects the formula — not marketing or sponsorships.
What's in NutraBio L-Leucine?
Each serving contains L-Leucine, Fermented (3000 mg). Serving size: 3 Gram(s). 45 servings per container.
How do I take l-leucine?
Suggested Use: Add 1 scoop (3 grams) to your favorite beverage 1-2 times daily, or as directed by a physician. Mix for 15 to 20 seconds using a shaker cup or mix thoroughly with a spoon. May not mix very easily.
Who makes L-Leucine?
L-Leucine is made by NutraBio. See Formulate's full grade and product lineup for NutraBio on its brand page.
Is NutraBio L-Leucine third-party tested?
NutraBio lists the following certifications and testing for this product: Third-Party Tested, Gluten-Free.
Related Supplements
Track l-leucine in your stack
Build a personalized supplement stack free in your browser — no install. Flag dose overlaps and interactions, and keep every product scored against the latest evidence.
Is L-Leucine right for your goals?
Two questions, then every ingredient graded against what you're actually trying to do — plus what it costs per effective dose.
Build my stack2 questions · free · no account needed to start
Also on iPhone — get the free app
Evidence-based supplement guides, no spam
We send a short digest when new guides drop — nothing else. No affiliate pushes, no sponsored content, unsubscribe anytime.
Disclosure. Formulate may earn a commission from purchases made through links on this page. Commissions never influence scores — every product is graded by the same automated rubric. This page is for educational purposes only and does not replace advice from a qualified healthcare provider.