Natrol Theanine supplement bottle
Natrol

Theanine Review

What We Researched
1 active ingredient analyzed · 8 inactive ingredients decoded · 7 brand certifications checked · Last updated: Aug 2026
100
Product Score Excellent
96
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
Suntheanine L-Theanine 150 mg †
Bioavailability Excellent

Absorption Rating

  • Suntheanine L-Theanine Good
Other Ingredients Excellent

Fillers & Additives

  • Cellulose
  • Cellulose Gum
  • Stearic Acid
  • Silica
  • Magnesium Stearate
  • Methylcellulose
  • Glycerin
  • Carnauba Wax
Efficacy Excellent

Dosage Analysis

  • Suntheanine L-Theanine 150 mg Effective

Supplement Facts

Ingredient Amount % Daily Value
Suntheanine L-Theanine 150 mg †

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Cellulose Safe

Provides bulk and structure in tablets and capsules.

Cellulose Gum Safe

Thickens and stabilizes supplement formulations.

Stearic Acid Safe

Helps ingredients flow smoothly through manufacturing equipment.

Silica Safe

Prevents ingredients from clumping and improves powder flow.

Magnesium Stearate Safe

Prevents ingredients from sticking to manufacturing equipment during tableting.

Methylcellulose Generally_safe

It is used as a thickener or binder.

Glycerin Safe

Retains moisture and helps dissolve ingredients in softgels and liquids.

Carnauba Wax Safe

Provides a glossy, protective coating on tablets.

Brand Trust Report
Natrol

Founded 1980 · Chatsworth, California, USA · 319 products · natrol.com

Certifications

7 certifications
Consumerlab Verified Source
Npa Gmp Verified Source
Fda Gmp Inspections Verified Source
Nsf Gmp Verified Source
USP Verified Verified
IGEN Non-GMO Tested Verified
NSF Certified Verified

Transparency

5 claims
Third Party Testing Claim — Verified Source
Testing Lab Disclosure — Claimed Source
In House Testing — Verified Source
Contains Proprietary Blend — True

Violation History

8 incidents
Lawsuit Marketing Relax+ Ultimate Calm as a treatment for anxiety.RecentSource
Lawsuit Falsely advertising '100% Drug-Free' on Liquid Melatonin which allegedly contains ethyl alcohol.2021Source
Lawsuit False and deceptive claims about the memory-improving capabilities of Cognium supplements.2021Source
Fda Warning Public health warning against the purchase and consumption of unregistered food supplements.2020-07-21Source
Lawsuit Claims that their biotin products were ineffective.2017Source
Lawsuit Falsely advertising the joint health benefits of their glucosamine and chondroitin products.2013Source
Lawsuit Deceptive marketing claims regarding L-Arginine supplements.2013Source
Prop 65 Not specified in the article2002-04-22Source
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Frequently Asked Questions
Is Natrol Theanine a good supplement?

Natrol 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 30 servings per container. Of the 8 inactive ingredients, 7 are rated safe and 0 are flagged for review. The manufacturer, Natrol, holds a brand trust score of 96/100 with 7 verified certifications including Consumerlab, Npa Gmp, Fda Gmp Inspections, Nsf Gmp.

What are the ingredients in Natrol Theanine?

Natrol Theanine contains 1 active ingredients: Suntheanine L-Theanine (150 mg). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Natrol Theanine safe to take?

Natrol Theanine 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 Natrol a trustworthy supplement brand?

Natrol receives a brand trust score of 96/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1980 and headquartered in Chatsworth, California, USA, the company offers 319 products in their lineup. They hold 7 verified certifications including Consumerlab, Npa Gmp, Fda Gmp Inspections, Nsf Gmp. Third-party certifications are independently verified and indicate the brand meets specific quality, purity, and manufacturing standards. Note: Natrol has 8 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.