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L-Theanine 90 Capsules


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Product Options: Capsules - 90 x 100 mg

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L-theanine is absolutely ideal for anyone looking to increase energy levels while simultaneously improving physique and athletic performance. L-theanine supplements can help beat fatigue by boosting energy levels, they can help beat stress, they can boost the immune system, they can enhance mental health and cognitive function, and much more. Read the full product description for more information.


What is L-Theanine?

L-theanine is a naturally occurring amino acid that is found within green tea, and other teas as well for that matter, just in slightly smaller dosages. The amino acid is non-essential, so the body can synthesize it naturally, albeit in much smaller dosages than those that have been shown to be beneficial. This amino acid has antioxidant-like properties, making it very beneficial for people looking to actively improve their health and well-being. Once consumed, it has been found to cause a whole host of changes in an individual’s body chemistry, helping them to relax, to rejuvenate, and much more besides.

How does it work?

Once consumed, L-theanine has the ability to quickly pass the blood-brain barrier, allowing it to very quickly make its way into the brain, where it can then work its magic. The amino acid provides a number of different benefits, and for that reason, it has been found to work in a number of different ways. In terms of stress for example, the amino acid has proved especially beneficial for a number of reasons. Once consumed, L-theanine has been found to gradually slow down the heart rate, as well as to reduce salivary responses to stressful stimuli in people of all ages and genders. The amino acid helps to promote the formation of alpha brainwaves, which serve as a clear indicator of a person being relaxed and calm. Not only that, but as it has antioxidant-like properties, it has also been found to help strengthen the immune system, and to help rid the body of toxins and harmful free-radicals in the process.

What are the benefits of using L-Theanine Supplements?

Some of the primary benefits associated with using L-theanine supplements include:


As previously mentioned, once consumed, l-theanine can quickly cross the blood-brain barrier where it can enhance the production of alpha brainwaves, as well as slowing a person’s heart rate down, and helping them to relax in stressful situations. This is also beneficial as it can help to promote a good night’s sleep as well.


As this amino acid is packed full of so many natural healing properties, it has been found time and time again, to be very beneficial for people looking to strengthen their immune systems. L-theanine boosts immunity, it provides resistance to illness and disease, and it provides anti-bacterial and microbial benefits as well.


For people who are constantly feeling tired and worn down, this could be a sign of adrenal fatigue, which is a medical condition which can lead to other more serious conditions. Studies however, have found that L-theanine supplementation could help to counteract the effects of adrenal fatigue, and it could help to prevent it altogether. This means that it can help people to feel more alert and invigorated, and it can help them to avoid suffering from more serious health conditions.

Other benefits include:

  • Boosts immunity
  • Fights fatigue
  • Promotes mental health
  • Helps promote rest and relaxation
  • Helps boost the immune system
  • Can prevent illness and disease
  • Provides topical benefits
  • Increases energy
  • Helps promote rest and relaxation
  • Provides cognitive health benefits
  • And more...

How and when should it be consumed?

Health Canada Recommended Dose capsules): Adults: 2 Capsule(s) 1 time(s) per day.

What can it be stacked with?

L-theanine can be stacked with a whole host of other supplements designed to provide general health and well-being benefits, although commonly, it is found in the following types of supplement stack: multi-vitamin, omega 3 supplement, glucosamine, BCAAs, whey protein, L-theanine, and casein protein.

L-Theanine Ingredients

Ingredients Per Capsule

Medicinal Ingredients (per Capsule): L-Theanine .................................................................................................. 100 mg
Non-Medicinal Ingredients: Gelatin.

Potential side effects

As with all new supplements, always consult your doctor before using any new products, and discontinue usage immediately, if you experience any adverse side effects. Pregnant and breastfeeding women should consult their doctors before using this product. Although considered one of the safest and healthiest supplements currently on the market, some users have experienced adverse side effects, especially if the recommended daily dosage was exceeded. Potential side effects include:

  • Can interfere with other medicines and treatments
  • Excessive feelings of drowsiness and letharg
  • Upset stomach
  • Diarrhea
  • Constipation
  • Stomach cramps
  • Irritability


Caution: Not intended for children, pregnant, or breastfeeding women. Consult a healthcare practitioner prior to use. Consult a healthcare practitioner prior to use if you have health conditions. Store in a cool dry place away from children. Do not use if seal is broken.

Allergen warnings

Allergy Statement: This product is made in a facility that handles milk products, gluten, shellfish, soy, peanuts and other tree nuts.

Disclaimer: The above description does not constitute medical advice and is for informational purposes only and has not been evaluated by Health Canada, CFIA, or FDA. Please consult a properly licensed medical professional before consuming nutritional supplements. This product is not intended to treat, diagnose or cure any disease.

Customer Reviews

Based on 38 reviews
Danielle Debergh


Frank B

Helps me relax at night and catch some good sleep


Great price

Good so far

Seems to help with sleep so far

Carolyn Burpee

Helps me to relax at bedtime. Works very well.