Herbal L-Theanine

Best L-Theanine Supplements – Top 10 Brands for 2022

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Life in the 21st century is full of stresses that we may not be fully equipped to handle. There is constant pressure to keep up in school and work and to catch up to modern technology that advances every year.

We are working longer hours and sleeping less. We now sleep an average of around 6 hours a night, and in 1900 the average was around 9 hours every night.

On top of all of this, there are chemicals, pollutants, processed foods, and toxins that we are constantly consuming and being subjected to.

This takes a toll on your body, and as we all know, it can make us really stressed!

Taking initiative to manage this daily stress can make a world of difference in your life. It can improve your physical health and help you feel more well-rested, and it can sharpen your mental skills and improve your productivity.

There are different stress management techniques, and one of them includes healthy anti-stress supplementation. If you’re not comfortable with that, there are tons of teas that reduce stress because they are a natural source of l-theanine!

L-theanine, an amino acid found in green tea, is a great supplement for stress management and has many health benefits.

In order to help you find a good product, we’ve researched & compared the best theanine supplements on the market right now.

Top 10 L-Theanine Products Compared

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1. Now Foods L-Theanine


NOW Foods L-Theanine is a vegetarian and vegan theanine pill that offers an effective theanine dosage and is fortified with inositol. Inositol is a vitamin-like substance that is naturally present in citrus fruits, whole grains, and beans. This is a quality theanine product because it can be taken by anyone and it is effective, high quality, and affordable.


  • Affordable
  • Includes inositol
  • Vegan and vegetarian
  • Quality theanine dosage
  • Acts as an antioxidant

What’s in it:

  • One Serving (1 Veg Capsule) contains:
    • 200 mg L-Theanine
    • 100 mg Inositol

Who makes it: NOW Foods is an all-natural dietary supplement producer that offers affordable natural products to support your health. They have been a leader in the industry since 1968, and their mission has always been to provide value in products and services that empower people to lead healthier lives. They are also environmentally conscious and charitable, their facilities are sustainably built and they have donated to conservation and environmental causes, as well as world needs, disaster relief, and more.

Where to Get It

2. Country Life L-Theanine

Country Life L Theanine

Country Life offers a quality l-theanine dosage in a gluten-free and vegetarian capsule and is fortified with vitamin b6.


  • Gluten-free
  • Non-GMO
  • Vegetarian, Vegan, Kosher & Halal
  • Uses vitamin B6
  • Acts as an antioxidant

What’s in it:

  • One Serving (1 capsule) contains:
    • 200 mg Suntheanine L-Theanine
    • 4.25 mg Vitamin B6

Who makes it: Country Life Vitamins is a dietary supplement brand that uses clean, fresh, and authentic ingredients in their products to enhance the accuracy and consistency of their product formulas. You know that with Country Life, you are getting exactly what is stated on the label without any hidden ingredients. Their facilities operate NSF-GMP compliant and they are certified USDA Organic. Founded in 1971 in New York, they have been passionate about your health for over 40 years.

Where to Get It

3. Doctor’s Best Suntheanine L-Theanine

Doctors Best Suntheanine L Theanine

Doctors’s Best Suntheanine L-Theanine is a pure theanine pill that provides you a quality dose of l-theanine in a vegetarian pill. The capsule is made with cellulose and rice powder and contains suntheanine, which is l-theanine made with a patented fermentation process that may help to enhance its efficacy and potency.


  • Vegetarian & Vegan
  • Non-GMO
  • Gluten-Free
  • Soy-Free
  • Affordable

What’s in it:

  • One Serving (1 Veggie Capsule) contains:
    • 150 mg L-Theanine (from Suntheanine)

Who makes it: Doctor’s Best is a physician founded vitamin and supplement brand that has been around since 1990. They produce over 200 different nutritional products that are based on science and tested rigorously to meet high-quality standards. Their facilities are GMP certified and their products are entirely transparent. They also support research into new products and testing to continuously search for better health products.

Where to Get It

4. Source Naturals L-Theanine

Source Naturals L Theanine

Source Naturals L-Theanine is a theanine supplement that is fortified with calcium. Calcium is an essential mineral that is known for its ability to support bone strength and density. However, this product does use more additives and fillers than some alternatives.


  • Includes calcium
  • Gluten-Free

What’s in it:

  • One Serving (1 Tablet) contains:
    • 200 mg L-Theanine
    • 76 mg Calcium

Who makes it: Source Naturals is a vitamin and dietary supplement company that can be considered one of the leaders of the wellness revolution. It was founded in 1982 with the goal of helping each and every individual reach optimal states of health. They were one of the first supplement brands to combine many nutrients, herbs, and nutraceuticals in one formulation.

Where to Get It

5. Solaray L-Theanine

Solaray L Theanine

Solaray L-Theanine is a formula that mixes an amino acid with an herbal product: L-theanine and green tea leaf. L-theanine is actually a predominant active ingredient in green tea and is one of the reasons green tea has so many health benefits. By using pure green tea, this product provides the holistic benefits of green tea, such as additional antioxidants and polyphenols, with enhanced L-theanine benefits. Though this is an effective theanine supplement, it is also more pricey in comparison to other equally effective products.


  • Vegetarian capsule
  • Includes green tea leaf
  • No artificial colors, flavors or preservatives

What’s in it:

  • One Serving (1 VegCap) contains:
    • 200 mg L-theanine
    • 100 mg Green Tea Leaf

Who makes it: Solaray is a nutraceutical brand that was founded in Utah in 1973 and acquired in 1993. They helped to pioneer the concept of encapsulated herbal blends and they are now a well known leading brand in the health food industry. They have over 1000 different products such as herbs, herbal extracts, vitamins, minerals, amino acids, fatty acids, probiotics, and enzymes.

Where to Get It

6. Pure Encapsulations L-Theanine

Pure Encapsulations L Theanine

Pure Encapsulations L-Theanine is a vegetarian/vegan and hypoallergenic theanine supplement that comes with minimal additional ingredients. It utilizes a patented form of L-theanine called suntheanine that is processed using fermentation and is intended to enhance its efficacy and potency.


  • Hypoallergenic
  • Gluten-Free and non-GMO
  • Vegetarian & Vegan
  • Uses suntheanine

What’s in it:

  • One Serving (2 capsules) contains:
    • 400 mg L-Theanine

Who makes it: Pure Encapsulations is a hypoallergenic nutritional supplement brand that takes a minimalist approach to dietary supplementing by avoiding harmful additives, fillers, sweeteners, coatings, and colors. Their products are research-based in order to provide you with predictable and desired results.

Where to Get It

7. Solgar L-Theanine

Solgar L Theanine

Solgar L-Theanine is a pure theanine supplement that comes in a vegetable capsule to create a vegetarian theanine pill. It uses suntheanine, which is a form of L-theanine that is derived from a patented fermentation process that is supposed to enhance absorption and promote optimum assimilation.


  • Vegetarian
  • Uses suntheanine
  • Gluten, Wheat & Dairy Free

What’s in it:

  • One Serving (1 Vegetable Capsule) contains:
    • 150 mg Suntheanine L-Theanine (Free Form)

Who makes it: Solgar is a brand that is known for producing quality vitamins, supplements, and herbs. They use research, science-based ingredients, state of the art manufacturing facilities, high-quality controls, a USP water purification system, and more which constitutes Solgar’s Gold Standard. They are one of the older brands and have been around since 1947.

Where to Get It

8. Thorne Research Theanine

Thorne Research Theanine

Thorne Research Theanine is a pure, basic theanine supplement that comes in a vegetarian theanine pill. This product uses a quality theanine dosage of 200mg per serving. If you are looking for a basic theanine pill at a quality theanine dosage, this may be the choice for you.


  • Vegetarian
  • Does not include a variety of allergens
  • Non-GMO
  • Gluten-Free, Dairy-Free, Soy-Free
  • No Artificial Flavors

What’s in it:

  • One Serving (One Capsule) contains:
    • 200 mg L-Theanine

Who makes it: Thorne Research is a well known dietary supplement producer that has been in the industry for over 30 years. They have continuously been dedicated to enhancing the health and well being of their customers by providing high quality, innovative, and research-based nutritional supplements. They are currently striving to become a leading worldwide healthcare company.

Where to Get It

9. Sports Research L-Theanine


Sports Research L-Theanine is a suntheanine supplement that is formulated with virgin coconut oil and encapsulated in a liquid soft-gel for quick release and better absorption.


  • Kosher, Gluten-Free & Non-GMO
  • Uses suntheanine
  • Formulated with coconut oil
  • Uses softgel for fast enhanced absorption

What’s in it:

  • One Serving (1 Liquid Softgel) contains:
    • 200 mg L-Theanine (Suntheanine)

Who makes it: Sports Research is a sports nutrition company that is family run and dedicated to providing its customers with the highest quality products using only heavily researched ingredients. All of their vitamins and dietary supplements are packaged and manufactured in GMP certified facilities. They also test every batch of ingredients to ensure purity, and you can actually track your batch and find out the lab results of your Sports Research product.

Where to Get It

10. Bluebonnet Nutrition L-Theanine


Bluebonnet Nutrition L-Theanine is a pure theanine product that utilizes a patented free form called suntheanine. Suntheanine is derived from L-theanine and is a reduced form that comes from a patented fermentation process which is intended to enhance its concentration and potency.


  • Gluten-Free, Soy-Free & Non-GMO
  • Vegetarian/Vegan/Kosher
  • Uses suntheanine

What’s in it:

  • One Serving (1 Capsule) contains:
    • 150 mg L-Theanine (free-form)

Who makes it: BlueBonnet Nutrition is a nutritional supplement brand that focuses on vitamins, minerals, and herbal supplements. They have been combining the best of nature and science to produce natural effective health supplements since 1991. They were awarded to first Manufacturer of the Year award in 2006 by Vitamin Retailer.

Where to Get It

Frequently Asked Questions About L-Theanine Supplements

What is L-Theanine?

Theanine, also referred to as L-theanine, is an amino acid that is found in green tea. Green tea has been around for thousands of years and originated in China, and is the most popular type of tea in China.

It is said that the ancient Emperor Shennong was traveling and stopped to rest with his convoys beneath a tea tree. Some of the tea leaves fell from a burning twig into Shennong’s cup of hot water, turning it a darker color, but the emperor did not see and took a sip. He found it pleasant and had his convoys prepare it for him from then on, or so the story goes.

Green tea has been used throughout history by Buddhist monks to help them meditate, because of its relaxing effects on the body.

However, we did not know about theanine in green tea until 1949. It has since been discovered to be contained in black teas as well.

Relaxation is one of the effects theanine is well known for. It has also been studied for its effects on mental clarity and alertness.

Some studies have found that its effects on the brain are observable on an EEG scan, which tracks and records electrical impulses in the brain. It seems to enhance a particular form of brainwave activity, called alpha activity, which plays a role in sustaining mental attention.

Speaking of alpha activity, there is another amino acid that has this effect on brain waves that you may be familiar with called glutamine.

Glutamine an essential amino acid that your body has to consume from your diet in large amounts (or from a good glutamine supplement), and it promotes digestive health and brain health as well as muscle growth and athletic performance.

Theanine is an analog of glutamine and helps to enhance the production of  GABA (a neurotransmitter that is critical to relaxation) and alpha brainwave activity.

What Are L-Theanine Supplements?

Theanine supplements generally come in the form of L-theanine, which is the bioavailable supplement form of theanine.

There is another supplemental form of theanine that can be used in supplements called suntheanine. Suntheanine is a theanine supplement made with a patented fermentation process that is supposed to ensure effectiveness and consistency.

Technically, suntheanine is a derivative of theanine because the fermentation process reduces theanine to the ingredient suntheanine. It is promoted as being purer and requiring a lower dosage.

In general, there does not seem to be any significant difference between the efficacy or quality of L-theanine and suntheanine, so you can consider them equals.

Theanine products come in different forms including capsules, pills, and tablets.

What Are the Uses & Benefits of L-Theanine?

Theanine acts as a strong nootropic supplement by crossing the blood-brain barrier to support and enhance cognitive function and promote relaxation. It is a derivative of glutamate that is capable of enhancing GABA levels in the brain to promote relaxation.

It also can help to sharpen attention by enhancing alpha activity in the brain, which has been consistently associated with mental attention and concentration.

Theanine supplements are ultimately great for protecting the body from damage due to stress, which results from the hormone cortisol, as well as reducing symptoms of stress and anxiety.

Who May Benefit from L-Theanine?

  • College Students – Everyone knows that college is extremely stressful. College students now report higher stress levels than ever before according to Time Magazine. However, theanine supplements may come to student’s aid. A Japanese study found that students who take L-theanine experienced less anxiety and have smaller increases in blood pressure when subjected to physical or mental stress. Another study found that graduate students who take L-theanine experienced less anxiety when assigned stressful work.
  • Those with Anxiety – Anxiety is a generalized term that describes several disorders that cause nervousness, fear, worrying, and apprehension. Generalized Anxiety Disorder (GAD), panic disorders, phobias, social anxiety disorder, Obsessive-Compulsive Disorder (OCD), Post-Traumatic Stress Disorder (PTSD), and separation anxiety are some of the most common diagnosable anxiety disorders. However, you do not have to have a particular anxiety disorder to experience anxiety.
  • Those with Sleeping Troubles – There are many different things that may hinder your ability to fall asleep or have quality sleep. Some common sleep disorders include insomnia, sleep apnea, restless leg syndrome, and narcolepsy. Sleeping problems may be derived from a shift in your sleep-wake cycle (otherwise known as the circadian rhythm) or things such as stress and anxiety, or unhealthy eating habits and lack of exercise. No matter what the issue may be, theanine may help you get a good night’s sleep. By enhancing alpha brain activity and GABA production, theanine can help you reach a mental state of deep relaxation that can help you to fall asleep and achieve a deeper quality of sleep throughout the night. For the best results, you should generally take theanine 30 minutes before bed.
  • Those with Attention Disorders – Attention disorders are conditions that affect one’s ability to concentrate. The two most common attention disorders are Attention Deficit Disorder (ADD) and Attention Deficit Hyperactivity Disorder (ADHD). ADHD and ADD are actually used interchangeably to describe these attention disorders. ADD is a developmental disorder that is characterized by distractibility, disorganization, and forgetfulness. Theanine can help ADD or ADHD by improving focusing abilities. Using theanine in conjunction with caffeine may provide the best results.
  • Gamers: E-sports has blown up and more and more people are becoming professional gamers each year. They’re also turning to helpful supplements for gamers, such as theanine for stress relief and concentration, alertness and more.

Note: We do not recommend taking L-theanine for any condition without speaking to your doctor first.

How Do I Take L-Theanine?

Theanine is a water-soluble supplement, so you can take it with or without food at any time of day. If you are taking theanine supplements to reduce anxiety and promote relaxation, taking 100-200 mg is recommended.

L-Theanine can offset some of the negative effects of stimulants such as caffeine, which is why it’s sometimes added as an ingredient in the strongest weight loss pills that have stimulants and some popular pre-workout supplements even add it in for the same reason.

To take advantage of its cognitive benefits, the best dosage is around 200mg theanine stacked with 100mg caffeine. If you are taking it to enhance sleep quality, taking it around 30 minutes before bed is ideal.

Are There Any Side Effects of L-theanine?

Theanine is very well tolerated by a majority of people and does not have consistently reported negative side effects. It is in green tea and has been consumed for thousands of years without side effects. Some people have experienced dizziness or headache after consumption. In large doses, it may reduce your blood pressure too much.

How Do I Pick a Good L-Theanine Product?

When searching for a high-quality theanine supplement you should pay attention to a couple of different aspects about the product.

The first and most important thing to pay attention to is the supplement facts. The supplement facts will tell you everything that is in the supplement and how much is included in that particular formula.

Related: How to properly read a supplement facts label

You want a theanine product to have a quality theanine dosage, and the higher end theanine supplements tend to have doses of around 100 to 200mg per serving.

You should also check if there are other ingredients in the supplement formula because some theanine supplements are not pure theanine and may be intended for a particular purpose such as enhancing sleep or improving attention and focus. The theanine formulas for focus may include caffeine, which would not be beneficial to improving sleep quality.

You should also pay attention to the manufacturer and their reputation. You can do this by doing a little bit of research on the company or brand. Generally, a trustworthy and reliable brand will be open and transparent about their products and they will not attempt to hide ingredients inside of proprietary blends.

They also may provide information about their manufacturing facilities and let customers know that they are GMP certified or registered with the FDA.

Finally, you want to take both of these factors into account when determining if the price is right. The supplement facts will tell you how much theanine you are getting and the number of servings. You should look for a product that has a good source of l-theanine and quantity with a reliable manufacturer for the best price. Make sure to compare prices and shop around to get an idea of the market.

How Did We Pick These Supplements?

Our core value at Top10Supps is transparency which is why we are open about how we pick the supplements that you just saw. You can read more about our supplement ranking methodology here.

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