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SuperiorLabs L-Theanine supplement bottle
SuperiorLabs

L-Theanine Review

What We Researched
1 active ingredient analyzed · 2 inactive ingredients decoded · 2 brand certifications checked · Page generated: Sep 2026
100
Product Score Excellent
78
Brand Score Fair

Two independent scores — the product and the brand behind it, never blended into one number. See our methodology.

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
L-Theanine 250 mg †
Bioavailability Excellent

Absorption Rating

  • L-Theanine Good
Other Ingredients Excellent

Fillers & Additives

  • Natural Rice concentrate
  • Plant Cellulose
Efficacy Excellent

Dosage Analysis

  • L-Theanine 250 mg Effective

Supplement Facts

Ingredient Amount % Daily Value
L-Theanine 250 mg †

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Natural Rice concentrate Unknown
Plant Cellulose Safe

It is used as a filler or binder.

Brand Trust Report
SuperiorLabs

Founded 2012 · Creswell, OR, USA · 54 products · superiorlabs.com

Certifications

2 certifications
Fda Gmp Inspections Source available Primary evidence
NSF Certified Supporting evidence unavailable

Transparency

4 claims
Third Party Testing Claim — Claimed Evidence available Evidence
In House Testing — Verified Evidence available Evidence
Testing Lab Disclosure — True Brand claim; evidence unavailable

Violation History

2 incidents
Fda Warning Serious violations of CGMP regulations and unapproved new drug claims on the company website.2023-04-27 Source available Primary source
Prop 65 Lead and lead compounds2018-07-20 Source available Primary source
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Frequently Asked Questions
Is SuperiorLabs L-Theanine a good supplement?

SuperiorLabs L-Theanine 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 90 servings per container. Of the 2 inactive ingredients, 1 are rated safe and 0 ingredients are flagged for review. The manufacturer, SuperiorLabs, holds a brand trust score of 78/100.

What are the ingredients in SuperiorLabs L-Theanine?

SuperiorLabs L-Theanine contains 1 active ingredients: L-Theanine (250 mg). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is SuperiorLabs L-Theanine safe to take?

GoodSupp reviewed the inactive-ingredient data available for SuperiorLabs L-Theanine. This label analysis cannot determine whether the product is safe for a particular person, and source labels may change. Always consult your healthcare provider before starting any new supplement, especially if you take medications or have underlying health conditions.

Is SuperiorLabs a trustworthy supplement brand?

SuperiorLabs receives a brand trust score of 78/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 2012 and headquartered in Creswell, OR, USA, the company offers 54 products in their lineup. Note: SuperiorLabs has 2 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 — read our methodology. 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.