Dr. Mercola L-Theanine plus GABA, 180 Capsules supplement bottle
Dr. Mercola

L-Theanine plus GABA, 180 Capsules

What We Researched
2 active ingredients analyzed · 3 inactive ingredients decoded · 4 brand certifications checked · 1 retailer compared · Last updated: Mar 2026
87
Product Score Good
81
Brand Score Good

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
Suntheanine® (L-Theanine) 200 mg *
GABA (Gamma-Aminobutyric Acid) 100 mg *
Bioavailability Fair

Absorption Rating

  • Suntheanine® (L-Theanine) Good
  • GABA (Gamma-Aminobutyric Acid) Poor
Other Ingredients Excellent

Fillers & Additives

  • Capsule (Hydroxypropyl Methylcellulose)
  • Bamboo Extract
  • Ascorbyl Palmitate
Efficacy Excellent

Dosage Analysis

  • Suntheanine® (L-Theanine) 200 mg Effective
  • GABA (Gamma-Aminobutyric Acid) 100 mg Effective

Supplement Facts

Ingredient Amount % Daily Value
Suntheanine® (L-Theanine) 200 mg *
GABA (Gamma-Aminobutyric Acid) 100 mg *

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Capsule (Hydroxypropyl Methylcellulose) Safe

It provides a vegetarian encapsulation option.

Bamboo Extract Generally_safe

It may be used as a source of silica or for its antioxidant properties.

Ascorbyl Palmitate Safe

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

Price Comparison

Vitacost $93.75 $1.04 / serving
Best Price

Price History

Tracked across major retailers. Updated periodically.

$96$95$94$93$92 Mar 12 $93.75
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
Dr. Mercola

Founded 1997 · Cape Coral, Florida, USA · 209 products · mercola.com/

Certifications

4 certifications
Consumerlab Verified Source
Nsf Gmp Verified Source
Usda Organic Verified Source
Fda Gmp Inspections Verified Source

Transparency

2 claims
Third Party Testing Claim — Verified Source

Violation History

7 incidents
Prop 65 Lead2025-04-18Source
Lawsuit Wrongful termination and breach of a severance contract by the former CEO.2024Source
Fda Warning Unapproved and misbranded products related to Coronavirus Disease 2019 (COVID-19).2021-02-18Source
Lawsuit False and unsupported claims that its indoor tanning systems are safe and do not increase the risk of skin cancer.2016Source
Fda Warning Illegal marketing of a medical device.2011-01-01Source
Fda Warning Illegal drug claims for various supplements.2006-01-01Source
Fda Warning Illegal drug claims for various supplements.2005-01-01Source
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Frequently Asked Questions
Is Dr. Mercola L-Theanine plus GABA, 180 Capsules a good supplement?

Dr. Mercola L-Theanine plus GABA, 180 Capsules received a product quality score of 87/100 in GoodSupp's independent analysis, indicating strong overall quality. The product contains 2 active ingredients with 90 servings per container. Of the 3 inactive ingredients, 2 are rated safe and 0 are flagged for review. The manufacturer, Dr. Mercola, holds a brand trust score of 81/100 with 4 verified certifications including Consumerlab, Nsf Gmp, Usda Organic, Fda Gmp Inspections.

What are the ingredients in Dr. Mercola L-Theanine plus GABA, 180 Capsules?

Dr. Mercola L-Theanine plus GABA, 180 Capsules contains 2 active ingredients: Suntheanine® (L-Theanine) (200 mg), GABA (Gamma-Aminobutyric Acid) (100 mg). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Dr. Mercola L-Theanine plus GABA, 180 Capsules safe to take?

Dr. Mercola L-Theanine plus GABA, 180 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 Dr. Mercola a trustworthy supplement brand?

Dr. Mercola receives a brand trust score of 81/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1997 and headquartered in Cape Coral, Florida, USA, the company offers 209 products in their lineup. They hold 4 verified certifications including Consumerlab, Nsf Gmp, Usda Organic, Fda Gmp Inspections. Third-party certifications are independently verified and indicate the brand meets specific quality, purity, and manufacturing standards. Note: Dr. Mercola has 7 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. 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.