California Gold Nutrition L-Theanine
vs
Douglas Laboratories L-Theanine
Supplement Comparison

  • L-Theanine: same total amount on both labels
  • The image below shows:
    • Side-by-side charts with label nutrient amounts, per serving
    • Nutrient forms as listed on the label
    • 2 nutrients compared
Bar chart: per-serving label amounts and listed forms for California Gold Nutrition L-Theanine vs Douglas Laboratories L-Theanine.

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Frequently asked questions

Which active ingredients does California Gold Nutrition L-Theanine have?

  • L-Theanine appears as AlphaWave L-Theanine

Which active ingredients does Douglas Laboratories L-Theanine have?

  • L-Theanine appears as Suntheanine L-Theanine

Which categories do California Gold Nutrition L-Theanine and Douglas Laboratories L-Theanine belong to?

  • Amino Acid Formula

What health concerns do California Gold Nutrition L-Theanine and Douglas Laboratories L-Theanine address?

  • Brain, Focus & Cognitive Function
  • Mood Support
  • Sleep Quality
  • Stress Management

Which product has a higher amount of L-Theanine per serving?

  • Both products list the same total amount of L-Theanine per serving

How do the serving sizes compare between the two supplements?

  • Serving size:
    • California Gold Nutrition L-Theanine: 1 capsule
    • Douglas Laboratories L-Theanine: 1 capsule

Last updated: February 20, 2026

  • Sources & Methodology: Nutrient data and forms are taken directly from Supplement Facts labels. Reviewed and standardized by the VIOscan Research Team. Learn more on the Methodology page.
  • We show the Recommended Dietary Allowance (RDA) when available. If no RDA exists, we show the Adequate Intake (AI). Tolerable Upper Intake Levels (UL) are used for upper limits. Unless otherwise noted, RDAs shown correspond to healthy adults aged 19–50 years and are sex-specific. Separate values exist for 51–70 years and >70 years, and pregnancy and lactation are excluded. All values come from the Dietary Reference Intakes (DRIs) published by the National Academies of Sciences, Engineering, and Medicine (NASEM), Food and Nutrition Board (FNB).
  • Transparency: We’re funded by our users. We don’t have sponsors or affiliate links, and we don’t sell supplements.
  • Editorial standards: we provide independent, impartial and objective data analysis.
  • This analysis is for educational purposes only. It is not a substitute for medical advice.
  • Questions? Read our Frequently Asked Questions or contact us, we’re here to help.
  • See an error? Report it through our Contact page.
  • Author: VIOscan Research Team