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L-Theanine (also known as Theanine, L-γ-glutamylethylamide and N5-ethyl-L-glutamine) is an analog of the amino acids of glutamate and glutamine. It was discovered as a constituent of green tea in 1949 and in 1950 was isolated from gyokuro leaves, which have high theanine content.

L- Theanine is used as a nootropic for its relaxing effects. It is advisable to take in combination with caffeine as research shows it can reduce potential negative effects, such as poor sleep quality, anxiety & increased blood pressure,  while possibly improving upon the positive aspects.


L-theanine increases levels of dopamine and serotonin in the brain which provides a feeling of calm and content.

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1000In Stock Manufactured by: L-Theanine

IUPAC name 3081-61-6
Canonical SMILES CCNC(=O)CCC(C(=O)O)N
SMILES CCNC(=O)CCC(C(=O)O)N
CAS Number (2S)-2-amino-5-(ethylamino)-5-oxopentanoic acid
Chemical Class Nootropics
Chemical name Theanine also known as L-γ-glutamylethylamide and N5-ethyl-L-glutamine
Density 1.2±0.1 g/cm3
Flash Point: 214.0±27.3 °C
Formula C7-H14-N2-O3
Molar mass 174.200 g·mol−1
Molar Refractivity: 43.2±0.3 cm3
Purity 99.99
Chem Spider number 388498
Index of Refraction: 1.492
InChI InChI=1S/C7H14N2O3/c1-2-9-6(10)4-3-5(8)7(11)12/h5H,2-4,8H2,1H3,(H,9,10)(H,11,12)/t5-/m0/s1
Enthalpy of Vaporization: 75.2±6.0 kJ/mol
PubChem CID 439378
UNII 8021PR16QO
Vapour Pressure: 0.0±2.2 mmHg at 25°C
Isomeric SMILES CCNC(=O)CC[C@@H](C(=O)O)N