Pro Theanine


Promotes relaxation without drowsiness

  • Pure L-theanine
  • Promotes a calm, relaxed alertness without causing drowsiness
  • Fast-acting and effective with one high dose capsule
  • Reduces feelings of stress and anxiety
Gluten Free

L-theanine is a unique amino acid primarily found in green tea. It helps reduce the effects of stress by altering central nervous system function, promoting alpha brain wave activity. The resulting effect is a state of relaxed alertness.

AOR Advantage:

Pro Theanine provides an optimal dose of L-theanine to provide fast-acting mental relaxation, with its stress-reducing effects typically felt within 30–40 minutes of consumption, with 30 more capsules per bottle.




Pro Theanine is L-theanine, a unique amino acid found primarily in green tea. Studies show that L-theanine promotes calm, relaxed alertness. AOR’s Pro Theanine contains Suntheanine®, which is made in a patented process that results in a 100% pure L-isomer-theanine.


AOR™ guarantees that all ingredients have been declared on the label. Contains no wheat, gluten, nuts, peanuts, sesame seeds, sulphites, mustard, soy, dairy, eggs, fish, shellfish or any animal by product.

Adult Dosage

Take one capsule daily without food, or as directed by a qualified health care practitioner.


Consult a health care practitioner prior to use if you are pregnant or breastfeeding.


The information and product descriptions appearing on this website are for information purposes only, and are not intended to provide or replace medical advice to individuals from a qualified health care professional. Consult with a health care practitioner if you have any health concerns, and before initiating any new diet, exercise, supplement, or other lifestyle changes.

Main Applications

• Stress
• Cognitive function
• Anxiety
• Mood

Serving Size: One Capsule
Suntheanine® (L-Theanine)
225 mg

Suntheanine® is a registered trademark of Taiyo International

Non-medicinal Ingredients: Microcrystalline cellulose.
Capsule: hypromellose

The relaxing effect of L-theanine is attributed to its ability to readily cross the blood-brain-barrier and alter central nervous system (CNS) activity. L-theanine increases the metabolism of dopamine and serotonin associated with mood and mental function. As well, it increases alpha brain wave activity, promoting relaxation and concentration.

Stress Reduction

L-theanine’s anti-stress properties have also been demonstrated. Results of one trial showed that L-theanine intake resulted in reductions in heart rate and salivary immunoglobulin-A responses to acute stress tasks, relative to controls. This effect was attributed to L-theanine’s activity within the sympathetic nervous system, inhibiting cortical neuron excitation.1

Learning and Memory

Animal studies suggest that L-theanine may also have a positive effect on memory and learning ability. In one small human study, elderly subjects with cognitive dysfunction showed significantly lower decline in cognition when given the equivalent of 47.5 mg of theanine daily via green tea powder.2

Benefits for the Liver and Nerve Health

L-theanine has been shown to protect the liver and nervous system from certain toxins such as D-galactosamine and excitotoxins, respectively.

Sleep Quality in ADHD

In a study of eight 12-year-old boys with attention deficit/hyperactivity disorder, consuming 200 mg of L-theanine twice daily significantly improved sleep efficiency (percentage of the night spent sleeping restfully). As well, subjects experienced less nighttime motor activity compared to those taking placebo.3


Kimura K. et al. L-theanine reduces psychological and physiological stress responses. Biol Psychol. 2007; 74(1): 39–45

Kakuda, T. Neuroprotective effects of theanine and its preventative effects on cognitive dysfunction. Pharmacol Res. 2011; 64(2): 162-8

Lyon M.R. et al. The effects of L-theanine (Suntheanine®) on objective sleep quality in boys with attention deficit hyperactivity disorder (ADHD): a randomized, double-blind, placebo-controlled clinical trial. Altern Med Rev. 2011 Dec; 16(4): 348-54

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