NOW Foods Sports, L-Leucine Powder, 9 oz (255 g) supplement bottle
NOW Foods

Sports, L-Leucine Powder, 9 oz (255 g)

What We Researched
1 active ingredient analyzed · 1 inactive ingredient decoded · 7 brand certifications checked · 3 retailers compared · Last updated: Mar 2026
100
Product Score Excellent
100
Brand Score Excellent

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
L-Leucine Powder (Instantized, Non-GMO) (5,000 mg) 5 g *
Bioavailability Excellent

Absorption Rating

  • L-Leucine Powder (Instantized, Non-GMO) (5,000 mg) Good
Other Ingredients Excellent

Fillers & Additives

  • Non-GMO sunflower lecithin (<5%)
Efficacy Excellent

Dosage Analysis

  • L-Leucine Powder (Instantized, Non-GMO) (5,000 mg) 5 g Effective

Supplement Facts

Ingredient Amount % Daily Value
L-Leucine Powder (Instantized, Non-GMO) (5,000 mg) 5 g *

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Non-GMO sunflower lecithin (<5%) Unknown

Price Comparison

Vitacost $27.09 $0.53 / serving
Best Price
iHerb $31.82 $0.62 / serving

Price History

Tracked across major retailers. Updated periodically.

$33$31$29$27$25 Mar 12 $31.00$27.09
iHerb
Vitacost

Prices shown at time of last check. Click a retailer to see current price. GoodSupp is not affiliated with any retailer.

Brand Trust Report
NOW Foods

Founded 1968 · Bloomingdale, Illinois, USA · 996 products · nowfoods.com

Certifications

7 certifications
Consumerlab Verified Source
Informed Sport Verified Source
Labdoor Verified Source
Non Gmo Project Verified Source
Npa Gmp Verified Source
Usda Organic Verified Source
Fda Gmp Inspections Verified Source

Transparency

5 claims
Third Party Testing Claim — Verified Source
Coa Availability — Verified Source
Testing Lab Disclosure — Verified Source
In House Testing — Verified Source

Violation History

7 incidents
Lawsuit Mislabeled St. John's Wort supplement, containing significantly less of the active ingredient than advertised.NoneSource
Lawsuit A data breach that compromised personal and health information of employees and dependents.2023Source
Prop 65 Lead2021-11-30Source
Recall NOW Real Food® Raw Macadamia Nuts2020-06-12Source
Recall NOW Real Food® Zesty Sprouting Mix2018-06-21Source
Lawsuit Misleadingly using slack-fill packaging for their Vitamin C supplements.2015Source
Fda Warning Adulterated Dietary Supplement due to pesticide (quintozene) contamination in American Ginseng.2007-10-12Source
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Frequently Asked Questions
Is NOW Foods Sports, L-Leucine Powder a good supplement?

NOW Foods Sports, L-Leucine Powder, 9 oz (255 g) received a product quality score of 100/100 in GoodSupp's independent analysis, placing it in the top tier of supplements we've analyzed. The product contains 1 active ingredients with 51 servings per container. Of the 1 inactive ingredients, 0 are rated safe and 0 are flagged for review. The manufacturer, NOW Foods, holds a brand trust score of 100/100 with 7 verified certifications including Consumerlab, Informed Sport, Labdoor, Non Gmo Project.

What are the ingredients in NOW Foods Sports, L-Leucine Powder?

NOW Foods Sports, L-Leucine Powder contains 1 active ingredients: L-Leucine Powder (Instantized, Non-GMO) (5,000 mg) (5 g). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is NOW Foods Sports, L-Leucine Powder safe to take?

NOW Foods Sports, L-Leucine Powder, 9 oz (255 g) has been analyzed for ingredient safety across all its components. Always consult your healthcare provider before starting any new supplement, especially if you take medications or have underlying health conditions.

Is NOW Foods a trustworthy supplement brand?

NOW Foods receives a brand trust score of 100/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1968 and headquartered in Bloomingdale, Illinois, USA, the company offers 996 products in their lineup. They hold 7 verified certifications including Consumerlab, Informed Sport, Labdoor, Non Gmo Project. Third-party certifications are independently verified and indicate the brand meets specific quality, purity, and manufacturing standards. Note: NOW Foods has 7 historical regulatory incidents on record, which are factored into the trust score.

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Disclaimer: GoodSupp provides independent supplement quality analysis for informational purposes only. Scores are generated algorithmically based on ingredient profiles, brand certifications, and public records. This is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Product data is sourced from manufacturer labels and public databases. GoodSupp is not affiliated with any supplement brand.