L-Theanine Supplement For Anxiety: What Is The Best Brand?

Do you feel nervous when confronted with new tasks? Are you constantly worried about simple things, like applying for a job or returning a purchase to a store clerk? When anxiety becomes the rules rather than the exception in your life, you may have GAD (generalized anxiety disorder), social anxiety or panic disorder.

If you have mild to moderate problems with daily anxiety, you don’t have to suffer anymore. L-theanine, an amino acid found in green tea and black tea, is proven safe to use for anxiety relief, in tea or as a supplement. Isolated as a component of green tea in 1949, it has gained acceptance as a supplement for anxiety and other health problems in the U.S. since 2011.  

L-Theanine for Social Anxiety

The list of social anxiety triggers, according to the Social Anxiety Association, includes:

  • Public speaking
  • Looking people in the eyes
  • Being the center of attention (being “put on the spot”)
  • Not knowing what to say or do in social situations (i.e., a party or conference)
  • Being watched while performing a task
  • Being criticized

The emotional and physical effects of social anxiety can be devastating. It isolates you, and can make you feel depressed and even affect your physical health.

An anxiety attack floods your body with the stress hormone cortisol, making it hard to get a grip on your sense of dread and fear. This state naturally decreases the amount of serotonin in your body. L-theanine can increase serotonin, a neurotransmitter in your brain responsible for a good mood

How Effective is L-Theanine for Anxiety?

Researchers worldwide have conducted L-theanine and anxiety studies. In the Netherlands, one study noted,  L-theanine significantly increases activity in the alpha frequency band which indicates that it relaxes the mind without inducing drowsiness.”, and other studies back up the results.  

L-theanine stimulates the brain’s Alpha waves, which give you a feeling of wakeful relaxation. This feeling is similar to what happens when you meditate. It offers other anti-anxiety benefits, including:

  • Increases dopamine, a neurotransmitter in the brain responsible for mood, memory, and pleasure
  • Promotes the production of  GABA, a neurotransmitter necessary for relaxation
  • Improves memory and reaction time when combined with caffeine (green tea contains caffeine)
  • Boosts learning by giving you the ability to filter out distractions   

Based on these facts, L-theanine reduces anxiety and is excellent for improving memory and focus.

You’ll find many L-theanine for anxiety reviews on YouTube and elsewhere on social media In this video, Mansal Denton gives his take on this non-essential amino acid.

L-Theanine Review – Anxiety Benefits and Concentration Tool (Video)

How to Take L-Theanine for Anxiety

Taking L-theanine for panic attacks and other anxiety-related problems opens up your life without the side effects of prescription anti-anxiety medicine.

The Cleveland Clinic recommends taking 200 to 400 mg of L-theanine day, and no more than 1200 mg daily as the appropriate L-theanine anxiety dosage.

L-theanine for anxiety side effects are relatively minor. They include dizziness, headaches, and upset stomach.

L-theanine may decrease the effectiveness of stimulant drugs, such as epinephrine, phentermine, pseudoephedrine (Sudafed). If you take low blood medication with L-theanine, it may cause extremely low blood pressure.   

Calm Down and Get Focused with L-Theanine

L-theanine is suitable for treatment of anxiety and stress, as well as poor concentration and insomnia.

Anxiety is different from stress. Anxiety is usually triggered by your thoughts (“What if this interviewer doesn’t like me?”) while stress is trigged by an external factor, like your house key getting stuck in the lock.  

The best L-theanine supplement for anxiety is the one that works for you. Try one of these L-theanine supplements to relieve anxiety:


L-Theanine Powder by Nootropics Depot

Nootropics Depot L-Theanine Powder

SymNutrition L-Theanine


Suntheanie L-Theanine


Final Thoughts

Taking an L-Theanine supplement will be even more effective if you establish new, positive behaviors in your daily routine.  Here are a few ways you can relieve stress and build a foundation of calm and confidence in your life –

  • Reduce or eliminate sugar, salt, fast-food and alcohol from your diet
  • Eat more fresh fruits and vegetables
  • Exercise every day, even if it’s only a walk around the block
  • Meditate daily
  • Expand your social circle. Meet new people through classes, volunteering or other activities
  • Laugh more. Watch funny videos or movies. Laughing releases dopamine, a happiness neurotransmitter

Feel free to leave a question or comment about the effects of L-Theanine on anxiety.

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Gloria Liscano - February 7, 2023

I have just started taking L-Theanine (by Jarrow). Today is my second day. I take 100mg in the morning on an empty stomach. I have discussed with my Cardiologist and she said it was okay. I decided to take in the morning as I take two blood pressure meds in the evening before bed (i.e. Isosorbide Dinitrate 15mg and Metoprolol Succinate 50mg). I tried Nature Made Melatonin 3mg with 200mg L-Theanine and it was too strong for me. I did not sleep well. I felt jittery. And for most of the next day I was very groggy. I only took one time.

My question is can I have a side effect where my head is itching and upper torso. Is this a temporary effect?


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