By Nicolas Martineau, B.Sc.

L-Theanine: An Amino Acid with Unique Benefits

L-theanine is a non-essential amino acid mostly found in tea leaves, especially green tea (Camellia sinensis). Known for its relaxing properties and positive effects on mental health, it is gaining popularity as a natural supplement that promotes calmness, focus, and concentration.

Physical and Chemical Properties

Chemically, L-theanine is a derivative of glutamic acid and ethylamine. This water-soluble compound can cross the blood-brain barrier, allowing it to reach the brain and deliver its beneficial effects.

Natural Sources of L-Theanine

• Found primarily in green tea

• Present in smaller amounts in black and oolong tea

• Trace amounts in some mushrooms

Although widely consumed in tea, L-theanine is most valued as a natural health supplement.

Health Benefits of L-Theanine

Stress Reduction

L-theanine is best known for reducing stress and anxiety. It works by boosting neurotransmitters such as dopamine and serotonin, which help regulate mood.

Improved Focus and Concentration

This amino acid promotes relaxation without drowsiness. When combined with caffeine, naturally present in tea, L-theanine can enhance alertness and cognitive performance.

Sleep Support

Research suggests L-theanine may improve sleep quality. By promoting relaxation and reducing pre-sleep anxiety, it helps support restful sleep.

Deficiency and Imbalance

Unlike essential amino acids, L-theanine is not required from diet alone, since the body can produce it in small amounts. There are no direct deficiency symptoms, but high stress and poor mental balance may improve with supplementation.

Recommended Dosage of L-Theanine

There is no official daily requirement. However, Health Canada recommends 200–250 mg per day for adults when taken as a natural supplement.

⚠️ L-theanine may interact with certain medications. If you are under medical treatment, consult a healthcare professional before use.

How to Choose an L-Theanine Supplement

When selecting a supplement, check these important criteria:

• Origin: Choose Canadian-made supplements with an NPN (Natural Product Number).

• Quality: Look for products tested by independent laboratories.

• Form: Available in capsules, tablets, or powder.

• Brand: Select a trusted, reputable, and preferably local brand.

Land Art’s New L-Theanine

To help manage daily stress, Land Art now offers L-theanine capsules at 250 mg, the maximum dosage allowed by Health Canada.

• No drowsiness → can be taken anytime

• Easy-to-swallow capsules

• 180-capsule format at a competitive price

• Certified and made in Quebec

👉 Whether for stress management, better focus, or deeper relaxation, Land Art L-theanine is a natural and versatile choice.

Side Effects and Precautions

L-theanine is generally safe at recommended doses. Rare side effects may include mild headaches or digestive discomfort. Start with a lower dose to evaluate your personal tolerance.

Conclusion

An L-theanine supplement is a safe and natural option to support mental calm, focus, and overall well-being. Whether consumed through tea or as a supplement, it provides a gentle and effective way to manage stress in daily life.

References

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8080935/

https://health.clevelandclinic.org/l-theanine

https://webprod.hc-sc.gc.ca/nhpid-bdipsn/atReq.do?atid=l.theanine&lang=eng

https://www.healthline.com/health/l-theanine#risks-and-side-effects