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Insight Horizon Media

What is the purpose of L-theanine?

Author

Sarah Cherry

Published Feb 10, 2026

What is the purpose of L-theanine?

L-theanine is the form most commonly found in tea and supplements. L-theanine is used to improve mental function. It is also used for anxiety, mental impairment, stress, and other conditions, but there is no good scientific evidence to support these uses.

Does L-theanine make you happy?

Can Increase Serotonin Levels L-theanine does not consistently increase the brain’s serotonin “happy” neurotransmitter, associated with positive mood enhancement, but has been shown to result in an increase in some instances.

What is Theanine Serene good for?

L-theanine may help reduce stress, and a reduction in stress and increased relaxation can lower the heart rate. In turn, this may help lower blood pressure.

How much L-theanine should I take for social anxiety?

A calming effect is usually noted within 30 to 40 minutes after L-theanine is taken at a dose of 50 to 200mg, and typically lasts 8 to 10 hours. Moderate anxiety symptoms often improve with a regimen of 200mg once or twice daily.

When should you take L-Theanine for sleep?

If you’re using L-Theanine to help you wind down at night, it’s best to take the supplement between 30 minutes and an hour before your bedtime. This gives the compound time to calm and ease your mind before you start trying to fall asleep.

Is L-Theanine safe for long term use?

Conclusion: Our study suggests that chronic (8-week) l-theanine administration is safe and has multiple beneficial effects on depressive symptoms, anxiety, sleep disturbance and cognitive impairments in patients with MDD.

Does theanine calm anxiety?

Studies show that increasing intake of theanine can significantly reduce symptoms of anxiety, such as a racing heartbeat and increased secretion of immunoglobulin A in saliva. Its effects are somewhat similar to those of a sedative, but L-theanine is far from this prescription drug.

Is L-theanine bad for your liver?

According to a paper from Anhui Agricultural University in China, theanine can protect liver tissue, minimising damage to the liver from chronic inflammation and its resultant diseases. The amino acid was found to increase antioxidant enzyme activity in mice, and to improve the human immune system.

Should you take L-theanine at night?

Should I take L-theanine in the morning or at night?

Adding l-theanine to your morning routine is quick, easy and, for many, makes a notable difference to their day. What’s even better is that you can enjoy theanine on an empty stomach, with or without food, and it’s effectiveness won’t be inhibited.

What does L-Theanine do to the brain?

L-theanine elevates levels of GABA, as well as serotonin and dopamine. These chemicals are known as neurotransmitters, and they work in the brain to regulate emotions, mood, concentration, alertness, and sleep, as well as appetite, energy, and other cognitive skills.

Should I take L-theanine every day?

There have been no reported adverse effects linked to L-theanine. Indeed, adults generally tolerate L-theanine well. If you’re considering adding L-theanine to your daily wellness practice, a dose of 100-400 mg is recommended, beginning with the smallest dose and gradually increasing until you feel the effects.