XYMOGEN L-Theanine, 60 Vegetarian Capsules supplement bottle
XYMOGEN

L-Theanine, 60 Vegetarian Capsules

What We Researched
1 active ingredient analyzed · 4 inactive ingredients decoded · 4 brand certifications checked · 2 retailers compared · Last updated: Mar 2026
100
Product Score Excellent
96
Brand Score Excellent

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
L-Theanine 400 mg *
Bioavailability Excellent

Absorption Rating

  • L-Theanine Good
Other Ingredients Excellent

Fillers & Additives

  • Capsule (Hypromellose and Water)
  • Microcrystalline Cellulose
  • Ascorbyl Palmitate
  • Medium-Chain Triglyceride Oil
Efficacy Excellent

Dosage Analysis

  • L-Theanine 400 mg Effective

Supplement Facts

Ingredient Amount % Daily Value
L-Theanine 400 mg *

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Capsule (Hypromellose and Water) Safe

It is used to encapsulate supplement ingredients.

Microcrystalline Cellulose Safe

Adds bulk to small-dose supplements to make tablets/capsules a manageable size.

Ascorbyl Palmitate Safe

Prevents oxidation and extends shelf life of oil-based supplements.

Medium-Chain Triglyceride Oil Generally_safe

Price Comparison

Vitacost $54.99 $1.83 / serving
Best Price

Price History

Tracked across major retailers. Updated periodically.

$57$56$55$54$53 Mar 12 $54.99
Vitacost

Prices shown at time of last check. Click a retailer to see current price. GoodSupp is not affiliated with any retailer.

Brand Trust Report
XYMOGEN

Founded 2003 · Orlando, Florida, United States · 209 products · xymogen.com/

Certifications

4 certifications
Consumerlab Verified Source
Nsf Certified For Sport Verified Source
Fda Gmp Inspections Verified Source
Nsf Gmp Verified Source

Transparency

5 claims
Third Party Testing Claim — Verified Source
Coa Availability — Verified Source
Testing Lab Disclosure — Verified Source
In House Testing — Verified Source

Violation History

1 incident
Fda Warning The warning letter cited violations of current Good Manufacturing Practice (cGMP) regulations for dietary supplements, including failure to establish product specifications for the identity, purity, strength, and composition of the finished dietary supplement, and failure to conduct at least one appropriate test or examination to verify the identity of a dietary ingredient. The letter also noted that several products were considered new drugs because they were not generally recognized as safe and effective for their intended use.2011-12-13Source
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Frequently Asked Questions
Is XYMOGEN L-Theanine, 60 Vegetarian Capsules a good supplement?

XYMOGEN L-Theanine, 60 Vegetarian Capsules 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 4 inactive ingredients, 3 are rated safe and 0 are flagged for review. The manufacturer, XYMOGEN, holds a brand trust score of 96/100 with 4 verified certifications including Consumerlab, Nsf Certified For Sport, Fda Gmp Inspections, Nsf Gmp.

What are the ingredients in XYMOGEN L-Theanine, 60 Vegetarian Capsules?

XYMOGEN L-Theanine, 60 Vegetarian Capsules contains 1 active ingredients: L-Theanine (400 mg). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is XYMOGEN L-Theanine, 60 Vegetarian Capsules safe to take?

XYMOGEN L-Theanine, 60 Vegetarian Capsules 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 XYMOGEN a trustworthy supplement brand?

XYMOGEN receives a brand trust score of 96/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 2003 and headquartered in Orlando, Florida, United States, the company offers 209 products in their lineup. They hold 4 verified certifications including Consumerlab, Nsf Certified For Sport, Fda Gmp Inspections, Nsf Gmp. Third-party certifications are independently verified and indicate the brand meets specific quality, purity, and manufacturing standards. Note: XYMOGEN 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. 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.