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 · Last updated: Aug 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 Verified Source
Fda Gmp Inspections Verified Source
Usda Organic Verified Source
NSF Certified Verified
Non-GMO Project Verified Verified

Transparency

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

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.2013Source
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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 are flagged for review. The manufacturer, KAL, holds a brand trust score of 89/100 with 5 verified certifications including Nsf Gmp, Fda Gmp Inspections, Usda Organic, NSF Certified.

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?

KAL L-Theanine 100 mg 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 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. They hold 5 verified certifications including Nsf Gmp, Fda Gmp Inspections, Usda Organic, NSF Certified. Third-party certifications are independently verified and indicate the brand meets specific quality, purity, and manufacturing standards. 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.