L-THEANINE | Nustait




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L-theanine is an amino acid that occurs naturally in tea. When used as a dietary supplement, L-theanine has been shown to potentiate GABA, or gamma-aminobutyric acid, a naturally occurring amino acid that enhances cognition. It has also been shown to reduce stress, anxiety, and reverse blood pressure constriction of brain vessels caused by caffeine intake.

L-Theanine powder is derived from the Camellia Sinensis tea plant. Although tea has been consumed for centuries and touted for its benefits for just as long, it was only in 1949 that L-Theanine was discovered as a constituent in green tea. L-Theanine has been used in Japan since the 1960s.

L-Theanine may increase alpha brain waves, attention and relaxation without sedation, it may also modulate the release of dopamine and enhance mood. It works synergistically with caffeine to promote concentration, attention, and memory.


  • increases alpha brain waves
  • attention and relaxation without sedation
  • synergistic with caffeine
  • promotes concentration
  • promotes motivation
  • promotes memory
  • enhances  mood

We use pure L-Theanine at 200 mg, the clinically-studied serving for healthy individuals.


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