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Name
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L-Theanine
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Synonyms
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L-Theanine 3081-61-6;
N-Ethyl-L-glutamin; H-GLU(NHET)-OH;
H-GLN(ET)-OH; L-GLUTAMIC ACID GAMMA-(ETHYLAMIDE);
L-Theanine, 99%; (S)-2-Amino-4-(N-ethylcarbamoyl)butanoic acid
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CAS NO
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3081-61-6
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Molecular Formula
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C7H14N2O3
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Molecular Weight
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174.2
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EINECS Number
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221-379-0
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Melting Point
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207°C
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Boiling Point
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430.2±40.0 °C (Predicted)
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Density
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1.171±0.06 g/cm³ (Predicted)
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Refractive Index
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8 ° (C=5, H₂O)
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Storage Conditions
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2-8°C
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Solubility
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Soluble in water (up to 20 mg/ml).
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Form
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Powder
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Acid Dissociation Constant (pKa)
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2.24±0.10 (Predicted)
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Color
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White
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Odor
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Odorless
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Water Solubility
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almost transparency
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Usage
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Functional Foods and Beverages: L - theanine, a naturally occurring amino acid in tea, is often added to tea beverages, functional drinks, and health beverages. It can provide effects of relaxation, calmness, and focus without causing drowsiness.
Dietary Supplements: As a nutritional ingredient, L - theanine is used in dietary supplements for stress relief, improved sleep quality, cognitive enhancement, and mood stability. It is frequently combined with substances like caffeine, magnesium, or melatonin for stress reduction, anxiety relief, and better focus.
Sleep and Anxiety Improvement: L - theanine can regulate neurotransmitters (such as GABA, dopamine, and serotonin) in the brain. It helps relax nerves, reduce anxiety, and promote natural sleep onset, making it suitable for people with mild anxiety and sleep disorders.
Alertness and Focus Enhancement (Synergistic with Caffeine): When used with caffeine, L - theanine can mitigate the stimulating effects of caffeine while enhancing focus, alertness, and mental clarity. It is commonly used in energy drinks and nootropic formulations.
Cosmetics and Skincare (Emerging) : L - theanine is gradually being added to some high - end skincare products. It is claimed to have auxiliary functions such as soothing the skin, providing antioxidant effects, and stress - relieving for beauty purposes, mainly in calming and anti - stress skincare formulations.
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