Nature's Lab L-Theanine 200 mg supplement bottle
Nature's Lab

L-Theanine 200 mg Review

What We Researched
1 active ingredient analyzed · 5 inactive ingredients decoded · 6 brand certifications checked · Last updated: Aug 2026
100
Product Score Excellent
97
Brand Score Excellent

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 200 mg †
Bioavailability Excellent

Absorption Rating

  • L-Theanine Good
Other Ingredients Excellent

Fillers & Additives

  • Magnesium Stearate
  • Gelatin
  • Rice Flour
  • Silica
  • Silicon Dioxide
Efficacy Excellent

Dosage Analysis

  • L-Theanine 200 mg Effective

Supplement Facts

Ingredient Amount % Daily Value
L-Theanine 200 mg †

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Magnesium Stearate Safe

Prevents ingredients from sticking to manufacturing equipment during tableting.

Gelatin Safe

Forms the capsule shell that holds the supplement contents.

Rice Flour Safe

Natural bulking agent to fill capsule space. Hypoallergenic.

Silica Safe

Prevents ingredients from clumping and improves powder flow.

Silicon Dioxide Safe

Prevents clumping and ensures consistent dosing.

Brand Trust Report
Nature's Lab

Founded 2011 · Las Vegas, Nevada, United States · 65 products · natureslab.com/

Certifications

6 certifications
Fda Gmp Inspections Verified Source
USP Verified Verified
IGEN Non-GMO Tested Verified
USDA Organic Verified
Non-GMO Project Verified Verified
Gluten-Free Certified Verified

Transparency

4 claims
Third Party Testing Claim — Verified Source
In House Testing — Verified Source
Testing Lab Disclosure — True

Violation History

3 incidents
Fda Warning Serious violations of FDA's regulations for Current Good Manufacturing Practice (CGMP) in Manufacturing, Packaging, Labeling, or Holding Operations for Dietary Supplements. Specifically, failure to establish required specifications for points, steps, or stages in the manufacturing process where control is necessary to ensure the quality of the dietary supplement.2022-07-12Source
Prop 65 Not specified in the notice summary2020-11-25Source
Fda Warning Letter FDA Warning LetterSource
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Frequently Asked Questions
Is Nature's Lab L-Theanine 200 mg a good supplement?

Nature's Lab L-Theanine 200 mg 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, Nature's Lab, holds a brand trust score of 97/100 with 6 verified certifications including Fda Gmp Inspections, USP Verified, IGEN Non-GMO Tested, USDA Organic.

What are the ingredients in Nature's Lab L-Theanine 200 mg?

Nature's Lab L-Theanine 200 mg contains 1 active ingredients: L-Theanine (200 mg). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Nature's Lab L-Theanine 200 mg safe to take?

Nature's Lab L-Theanine 200 mg has been analyzed for ingredient safety across all its components. All 5 inactive ingredients — including capsule materials, fillers, and binders — are rated safe based on regulatory data and published safety research. This is a clean formulation with no controversial additives. Always consult your healthcare provider before starting any new supplement, especially if you take medications or have underlying health conditions.

Is Nature's Lab a trustworthy supplement brand?

Nature's Lab receives a brand trust score of 97/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 2011 and headquartered in Las Vegas, Nevada, United States, the company offers 65 products in their lineup. They hold 6 verified certifications including Fda Gmp Inspections, USP Verified, IGEN Non-GMO Tested, USDA Organic. Third-party certifications are independently verified and indicate the brand meets specific quality, purity, and manufacturing standards. Note: Nature's Lab has 3 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.