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KAL L-Theanine 100 mg supplement bottle
KAL

L-Theanine 100 mg Review

What We Researched
1 active ingredient analyzed · 5 inactive ingredients decoded · 5 brand certifications checked · Page generated: Sep 2026
100
Product Score Excellent
89
Brand Score Good

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

  • Cellulose
  • Magnesium Stearate
  • Stearic Acid
  • Silica
  • Coating
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.

Cellulose Safe

Provides bulk and structure in tablets and capsules.

Magnesium Stearate Safe

Prevents ingredients from sticking to manufacturing equipment during tableting.

Stearic Acid Safe

Helps ingredients flow smoothly through manufacturing equipment.

Silica Safe

Prevents ingredients from clumping and improves powder flow.

Coating Unknown
Brand Trust Report
KAL

Founded 1932 · Salt Lake City, Utah, United States · 351 products · kalvitamins.com

Certifications

5 certifications
Nsf Gmp Source available Primary evidence
Fda Gmp Inspections Source available Primary evidence
Usda Organic Source available Primary evidence
NSF Certified Supporting evidence unavailable
Non-GMO Project Verified 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
Contains Proprietary Blend — True Brand claim; evidence unavailable

Violation History

1 incident
Lawsuit A consumer class action was filed alleging that the marketing of a dietary supplement violated California's consumer-protection laws.2013 Source available Primary source
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Frequently Asked Questions
Is KAL L-Theanine 100 mg a good supplement?

KAL L-Theanine 100 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 30 servings per container. Of the 5 inactive ingredients, 4 are rated safe and 0 ingredients are flagged for review. The manufacturer, KAL, holds a brand trust score of 89/100.

What are the ingredients in KAL L-Theanine 100 mg?

KAL L-Theanine 100 mg 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 KAL L-Theanine 100 mg safe to take?

GoodSupp reviewed the inactive-ingredient data available for KAL L-Theanine 100 mg. 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 KAL a trustworthy supplement brand?

KAL receives a brand trust score of 89/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1932 and headquartered in Salt Lake City, Utah, United States, the company offers 351 products in their lineup. Note: KAL 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.