L-Theanine

L-theanine is a unique amino acid in tea (especially green tea), with core functions including:
Neuroregulation:

• Promote alpha brainwave generation, relieve stress, and improve focus (without causing drowsiness).
• Regulate GABA, dopamine, and serotonin levels to improve anxiety and sleep quality.
• Synergistic caffeine: reduces the tension caused by caffeine and prolongs the comfort of wakefulness (the "calm alertness" effect).
• Antioxidants and immunity: indirectly enhance glutathione levels and assist in combating free radicals; May enhance immune cell activity.

Application areas:

• Functional foods (stress reducing drinks, sleep aid supplements).
• In the field of medicine (auxiliary anti anxiety drugs, such as in combination with SSRIs).

Safety: Recognized as safe (GRAS), daily intake can reach 250-400 mg (with no significant side effects).