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tnvitamins L-Theanine 200 mg supplement bottle
tnvitamins

L-Theanine 200 mg Review

What We Researched
1 active ingredient analyzed · 4 inactive ingredients decoded · 1 brand certification checked · Page generated: Sep 2026
100
Product Score Excellent
77
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 200 mg †
Bioavailability Excellent

Absorption Rating

  • L-Theanine Good
Other Ingredients Excellent

Fillers & Additives

  • Rice Powder
  • Gelatin
  • Vegetable Magnesium Stearate
  • Silica
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.

Rice Powder Safe

It is used as a filler or flow agent.

Gelatin Safe

Forms the capsule shell that holds the supplement contents.

Vegetable Magnesium Stearate Safe

Prevents ingredients from sticking to equipment. Derived from vegetable sources.

Silica Safe

Prevents ingredients from clumping and improves powder flow.

Brand Trust Report
tnvitamins

Founded 1979 · Deer Park, NY, USA · 136 products · tnvitamins.com/

Certifications

1 certification
Consumerlab Source available Primary evidence

Transparency

2 claims
Third Party Testing Claim — Claimed Evidence available Evidence

Violation History

1 incident
Fda Warning Significant violations of Current Good Manufacturing Practice (CGMP) regulations for dietary supplements.2017-08-16 Source available Primary source
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Frequently Asked Questions
Is tnvitamins L-Theanine 200 mg a good supplement?

tnvitamins 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 4 inactive ingredients (fillers, binders, capsule materials) are rated safe — a clean formulation with no flagged additives. The manufacturer, tnvitamins, holds a brand trust score of 77/100.

What are the ingredients in tnvitamins L-Theanine 200 mg?

tnvitamins 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 tnvitamins L-Theanine 200 mg safe to take?

GoodSupp reviewed the inactive-ingredient data available for tnvitamins L-Theanine 200 mg. All 4 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 tnvitamins a trustworthy supplement brand?

tnvitamins receives a brand trust score of 77/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1979 and headquartered in Deer Park, NY, USA, the company offers 136 products in their lineup. Note: tnvitamins has 1 historical regulatory incident 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.