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Klaire Labs L-Theanine supplement bottle
Klaire Labs

L-Theanine Review

What We Researched
1 active ingredient analyzed · 5 inactive ingredients decoded · 2 brand certifications checked · Page generated: Sep 2026
100
Product Score Excellent
75
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 100 mg †
Bioavailability Excellent

Absorption Rating

  • L-Theanine Good
Other Ingredients Excellent

Fillers & Additives

  • Microcrystalline Cellulose
  • Hypromellose
  • Ascorbyl Palmitate
  • Water
  • Silicon Dioxide
Efficacy Excellent

Dosage Analysis

  • L-Theanine 100 mg Effective

Supplement Facts

Ingredient Amount % Daily Value
L-Theanine 100 mg †

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Microcrystalline Cellulose Safe

Adds bulk to small-dose supplements to make tablets/capsules a manageable size.

Hypromellose Safe

Forms vegetarian capsule shells. Dissolves easily in the stomach.

Ascorbyl Palmitate Safe

Prevents oxidation and extends shelf life of oil-based supplements.

Water Safe

Dissolves and carries water-soluble ingredients.

Silicon Dioxide Safe

Prevents clumping and ensures consistent dosing.

Brand Trust Report
Klaire Labs

Founded 1969 · Reno, Nevada, United States · 82 products · klaire.com

Certifications

2 certifications
Fda Gmp Inspections Source available Primary evidence
Usda Organic Source available Primary evidence

Transparency

2 claims
Third Party Testing Claim — Claimed Evidence available Evidence
In House Testing — Verified Evidence available Evidence
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Frequently Asked Questions
Is Klaire Labs L-Theanine a good supplement?

Klaire Labs 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 60 servings per container. All 5 inactive ingredients (fillers, binders, capsule materials) are rated safe — a clean formulation with no flagged additives. The manufacturer, Klaire Labs, holds a brand trust score of 75/100.

What are the ingredients in Klaire Labs L-Theanine?

Klaire Labs L-Theanine contains 1 active ingredients: L-Theanine (100 mg). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Klaire Labs L-Theanine safe to take?

GoodSupp reviewed the inactive-ingredient data available for Klaire Labs L-Theanine. All 5 inactive ingredients — including capsule materials, fillers, and binders — are currently classified as safe in GoodSupp's ingredient reference data. 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 Klaire Labs a trustworthy supplement brand?

Klaire Labs receives a brand trust score of 75/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1969 and headquartered in Reno, Nevada, United States, the company offers 82 products in their lineup.

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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.