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Premier Research Labs

Premier L-Theanine

200 mg L-theanine for calm focus without drowsiness.

Premier L-Theanine

200 mg L-theanine for calm focus without drowsiness.

60 CAPSULES · ~30 DAYS

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Premier L-Theanine delivers 200 mg standardized L-theanine per capsule for calm focus, mental clarity, and relaxation without drowsiness or overstimulation.*

Not sure if Premier L-Theanine fits your situation?

Free shipping over $99 · Ships in 1–2 days


The Premier Assay

Ten-point purity standard

  • PRL Quality Guarantee
  • Pure Vegan
  • Purity Verified
  • No Added Magnesium Stearate
  • Botanical Species Confirmed
  • Tested for Adulterants
  • No Chemical or Radiation Sterilization
  • Pathogen Microbiology Performed
  • Heavy-Metal Tested
  • Potency Verified

Description:

Premier L-Theanine provides evidence-based, high-potency support for calm focus and balanced mental clarity. Each vegan-friendly capsule delivers 200 mg of L-theanine, a standardized and stabilized active constituent, carefully processed to ensure consistent efficacy. Backed by clinical research, this supplement promotes relaxation, mental clarity, and focus without drowsiness or overstimulation.*

Why Choose Premier L-Theanine?

  • Clinically Relevant Dosing: Delivers 200 mg of L-theanine per capsule, the precise amount used in clinical studies for safe and effective support.* 

  • Clean Label Commitment: No non-nutritive ingredients, fillers, binders, or synthetic excipients—just targeted support. 

  • 3rd Party Tested: Ensuring purity, potency, and consistent efficacy. 

  • Vegan-Friendly: Non-GMO, gluten-free, soy-free, and manufactured in a GMP-certified facility. 

  • Caffeine Synergy: Smooths caffeine peaks for sustained, focused energy without jitters.* 

L-Theanine’s Mechanism of Action

L-theanine supports alpha brain wave activity, promoting a calm yet attentive mental state. By influencing neurotransmitters like glutamate, GABA, and serotonin, L-theanine helps maintain focus and clarity while managing stress. It also interacts with NMDA receptors to support calm focus without overstimulation.*

Product Pairings for Comprehensive CNS Support

For a complete approach to stress relief and relaxation, pair Premier L-Theanine with Tranquinol®, which features Suntheanine®, Affron®, magnesium malate, and synergistic botanicals for more comprehensive CNS support.*

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