Theanine

Amino Acids

Theanine

L‑theanine is a calming amino acid (found in tea) that promotes relaxed alertness—reducing stress and anxiety and improving focus without drowsiness. It may also help improve sleep quality, blunt stress‑related blood pressure spikes, and enhance cognitive performance when combined with caffeine.

Learn more about Theanine

Cancel anytime

HSA/FSA eligible

Results in a week

Physician reviewed

Every result is checked

CLIA-certified labs

Federal standard for testing

HIPAA compliant

Your data is 100% secure

All biomarkers

Content

Main Heading
Sub Heading
Sub Sub Heading

Key Facts

L-theanine is an amino acid found naturally in tea that supports a calm, focused mental state without sedation
Works by increasing alpha brain waves and enhancing neurotransmitters like serotonin and GABA involved in stress regulation
Supports mental clarity, relaxation, and a healthy stress response — useful for anyone balancing focus with calm

Ingredients

L-theanine, calcium laurate, hypromellose capsule, leucine, microcrystalline cellulose.

Why We Chose This

Thorne's theanine addresses the common challenge of needing focus without jitteriness or anxiety. The 200 mg dose is clinically studied and designed to shift your brain toward a relaxed-yet-alert state — similar to the calm focus many people experience after a cup of tea, but in a consistent, standardized form. This formulation supports your nervous system's natural ability to manage stress while maintaining mental performance, making it practical for work, study, or everyday moments when you need both clarity and composure.

Other Amino Acids

See more supplements

Acetyl-L-Carnitine

Acetyl-L-Carnitine is a highly bioavailable form of carnitine that supports cellular energy production and brain function. It may boost mental clarity, mood, and focus, and can help with age-related cognitive decline, fatigue, and nerve health.

Learn more

Amino Complex - Berry

Amino Complex – Berry is a berry‑flavored essential amino acid formula that fuels workouts and accelerates muscle recovery. It helps reduce post‑exercise fatigue and soreness while supporting lean muscle maintenance and improved performance.

Learn more

Creatine - 90 Servings

Pure creatine monohydrate (90 servings) to boost strength, power and muscle gains during high‑intensity training. Regular use may improve workout performance, speed recovery, and support increases in lean muscle—offering a long-lasting, value-packed supply.

Learn more

Glycine

Glycine is a simple, naturally occurring amino acid that supports restful sleep, a calm nervous system, and healthy collagen production. It may help with sleep disturbances, stress-related tension, muscle and joint recovery, and signs of skin aging.

Learn more

L-Glutamine

L‑Glutamine is a conditionally essential amino acid that fuels muscle recovery, supports immune function, and helps repair the intestinal lining. It may reduce post‑workout soreness, speed recovery after intense training, and support digestive health issues like gut permeability and IBS symptoms.

Learn more

L-Glutamine Powder

L-Glutamine Powder is a pure amino acid supplement that helps replenish glutamine used during intense exercise to support faster muscle recovery and reduce post-workout soreness. It may also support immune function and gut health by helping maintain intestinal barrier integrity and aiding recovery from digestive stress.

Learn more

NAC - N-Acetylcysteine - 90 Servings

NAC (N‑Acetylcysteine) is a potent precursor to glutathione that supports antioxidant defenses and liver detoxification. It may also promote healthy respiratory function by thinning mucus and support immune and oxidative-stress resilience.

Learn more

PharmaGABA-250

PharmaGABA-250 delivers 250 mg of naturally fermented GABA to support relaxation and a calm mood, helping promote restful sleep. It may help with everyday stress, occasional sleeplessness, and mild nervous tension.

Learn more

Frequently Asked Questions About Theanine

What is the supporting research for the benefits of theanine?

L-theanine is associated with reduced anxiety, sleep disturbance, and cognitive impairments. (clinical study in stress)
A single dose of L-theanine is associated with improved attention and reaction time. (EEG and attention study)
L-theanine appears to significantly reduce anxiety and improve sleep quality. (systematic review of L-theanine)

How do I take theanine?

Take 100-200 mg daily, typically in capsule form with water, adjusting based on your response.

For sleep support, take 200-400 mg about 30-60 minutes before bed to help ease into relaxation.

Can I take theanine with other supplements or medications?

L-Theanine is generally well-tolerated with most supplements, though it may interact with blood pressure medications, sedatives, and stimulants — so check with your healthcare provider before combining. Caffeine supplements should be avoided since they work against theanine's calming effects.

Who might benefit from taking theanine?

Anyone managing stress or seeking mental clarity benefits from theanine's ability to boost calming neurotransmitters like GABA and serotonin. Those struggling with focus, anxiety, or sleep quality find it particularly helpful for supporting relaxation without the drowsiness that other options might bring.

How long does it typically take to notice effects of theanine?

Most people notice theanine's calming effects within 30 to 60 minutes of taking it, with peak effects around the one-hour mark. Individual timing varies based on whether you take it on an empty stomach and personal absorption rates.

How it works

Test your whole body

Get a comprehensive blood draw at one of our 3,000+ partner labs or from the comfort of your own home.

An Actionable Plan

Easy to understand results & a clear action plan with tailored recommendations on diet, lifestyle changes, supplements and pharmaceuticals.

A Connected Ecosystem

You can book additional diagnostics, buy curated supplements for 20% off & pharmaceuticals within your Superpower dashboard.

Superpower is changing thousands of lives

90.2k, Alo wellness club trainer

Superpower tests more than  100+ biomarkers & common symptoms

Re-balance hormones

Say goodbye to fatigue

“Turns out my chronic fatigue was from hormone imbalance. Not a single doctor could tell me that while Superpower caught it immediately. Now I’m taking action and supplements and have never felt better.”

Mariah Wilkinson

Increase free testosterone

‍Finally gain muscle

"For years I was gymming but not seeing results. My energy was low, recovery was slow, and no one could knew why. Superpower showed me my testosterone was out of range. With the right plan, I finally broke through”

James Bromley

Man in a white cap standing shirtless outdoors, looking to the side under a clear blue sky.

Manage aches

Manage inflammation response

"I didn’t realize fatigue and aches were signs of chronic inflammation.
Superpower caught the imbalance before it became more of a problem”

A person looking to the side with a focused expression against a plain background.

Amara Gupta

A person wearing a white tank top jogs on a paved road.

Reduce cortisol

Stress less and feel more energy

"I always thought my tiredness was just part of a busy life. Superpower showed me my cortisol was out of balance. With a few changes, I finally feel energized again."

Conway Simons

Improve gut microbiome

Debloat and  feel lighter

"I used to feel constantly bloated and sluggish after meals. No one connected it to my gut health. With the right plan, my digestion is smoother, and I finally feel light and comfortable again."