20 Best Pure L Theanine [2024]

Are you looking for the best pure l theanine? Based on expert reviews, we ranked them. We've listed our top-ranked picks, including the top-selling pure l theanine.

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1 Pure Encapsulations L-Theanine | Amino Acid Supplement for Relaxation and Wellness* | 60 Capsules Pure Encapsulations L-Theanine | Amino Acid Supplement for Relaxation and Wellness* | 60 Capsules
2 Pure L-Theanine Powder, 100 Grams (1 Year Supply), Filler Free, No GMOs and Vegan Friendly Pure L-Theanine Powder, 100 Grams (1 Year Supply), Filler Free, No GMOs and Vegan Friendly
3 Superior Labs - Pure L-Theanine Non-GMO, No Additives - 250mg, 90 Vegetable Capsules - Powerful... Superior Labs - Pure L-Theanine Non-GMO, No Additives - 250mg, 90 Vegetable Capsules - Powerful...
4 Pure Original Ingredients L-Theanine (730 Capsules) No Magnesium Or Rice Fillers, Always Pure, Lab... Pure Original Ingredients L-Theanine (730 Capsules) No Magnesium Or Rice Fillers, Always Pure,...
5 Pure Original Ingredients L-Theanine (8 oz) Amino Acid Supplement, No Additives or Fillers Pure Original Ingredients L-Theanine (8 oz) Amino Acid Supplement, No Additives or Fillers
6 Pure Science L-Theanine Supplement 400 mg – Supports Cognition, Improves Mental Performance and... Pure Science L-Theanine Supplement 400 mg – Supports Cognition, Improves Mental Performance and...
7 L-Theanine Powder 8.8 Ounces (250g) - 100% Pure, Non-GMO, Gluten Free (Multiple Sizes) Mood and... L-Theanine Powder 8.8 Ounces (250g) - 100% Pure, Non-GMO, Gluten Free (Multiple Sizes) Mood and...
8 NOW Supplements, L-Theanine Pure Powder, Tension Management*, Amino Acid, 1-Ounce NOW Supplements, L-Theanine Pure Powder, Tension Management*, Amino Acid, 1-Ounce
9 VitaDirect Premium Pure L-Theanine Capsules 250 mg (Theanine), 120 Vegetarian Capsules, Non-GMO,... VitaDirect Premium Pure L-Theanine Capsules 250 mg (Theanine), 120 Vegetarian Capsules, Non-GMO,...
10 Pure Original Ingredients L-Theanine (365 Capsules) Amino Acid, No Magnesium or Rice Filler, Lab... Pure Original Ingredients L-Theanine (365 Capsules) Amino Acid, No Magnesium or Rice Filler, Lab...
11 Pure Lab Vitamins L-Theanine - 200 mg Slow Release Formula - 150 Vegan Caps - 75 Days Supply Pure Lab Vitamins L-Theanine - 200 mg Slow Release Formula - 150 Vegan Caps - 75 Days Supply
12 L-Theanine Powder 100g (500 Day Supply) 100% Pure, Non-GMO, Gluten Free, Mood and Cognitive... L-Theanine Powder 100g (500 Day Supply) 100% Pure, Non-GMO, Gluten Free, Mood and Cognitive...
13 Amazing Nutrition L-Theanine Dietary Supplement * 200 mg Pure Veggie Capules * Promotes Relaxation... Amazing Nutrition L-Theanine Dietary Supplement * 200 mg Pure Veggie Capules * Promotes...
14 Stress Relief Supplement for Women and Men by Primal Harvest Pure Ashwagandha Root Extract,... Stress Relief Supplement for Women and Men by Primal Harvest Pure Ashwagandha Root Extract,...
15 Sports Research Double Strength ‘Suntheanine’ L-Theanine with Organic Coconut Oil - Promotes... Sports Research Double Strength ‘Suntheanine’ L-Theanine with Organic Coconut Oil - Promotes...
16 NOW Supplements, L-Theanine 200 mg with Inositol, Stress Management*, 120 Veg Capsules NOW Supplements, L-Theanine 200 mg with Inositol, Stress Management*, 120 Veg Capsules
17 Vital Nutrients - L-Theanine 200 mg - Supports Normal Stress Levels and Cognitive Function - 60... Vital Nutrients - L-Theanine 200 mg - Supports Normal Stress Levels and Cognitive Function - 60...
18 Klaire Labs L-Theanine - 100mg Suntheanine to Promote Promote Relaxation (60 Capsules) Klaire Labs L-Theanine - 100mg Suntheanine to Promote Promote Relaxation (60 Capsules)
19 Integrative Therapeutics L-Theanine 200 mg - Suntheanine Brand L-Theanine - Promotes a Relaxed State... Integrative Therapeutics L-Theanine 200 mg - Suntheanine Brand L-Theanine - Promotes a Relaxed...
20 Pure Encapsulations Cortisol Calm | Supplement to Support Relaxation and Restful Sleep During Times... Pure Encapsulations Cortisol Calm | Supplement to Support Relaxation and Restful Sleep During...
Bestseller No. 1
Pure Encapsulations L-Theanine | Amino Acid Supplement for Relaxation and Wellness* | 60 Capsules
  • Supports Relaxation: l-Theanine is a unique amino acid derived from green tea, which has been recognized for centuries as having relaxant properties...
  • Support For Occasional Stress: I-Theanine may also ease occasional nervous tension and irritability and help moderate occasional stress.*
  • Nervous System Support: l-Theanine has been reported to moderate the effects of caffeine on the central nervous system.*
  • Pure Quality: Our supplements are made with only premium ingredients sourced from trusted suppliers and guided by our nutritional experts, then...
  • Pure Difference: What makes us different isn't just our process or what goes into our supplements -- what we leave out matters, too. Pure...
Bestseller No. 2
Pure L-Theanine Powder, 100 Grams (1 Year Supply), Filler Free, No GMOs and Vegan Friendly
  • Micro Ingredients L-Theanine Supplements, 100 Grams (1 Year Supply), Filler Free, No GMOs and Vegan Friendly.
  • No Additives, No Preservatives, No Fillers, No GMOs, No Artificial Colors, No Soy and No Gluten
  • Scoop included to get the measurement every time. Take it daily with or between meals by adding it to a shake or smoothie, see what the most nutrient...
  • Powder lover? Take it naturally in powder for higher concentration, quicker absorption, easier on the stomach, and more ways to have fun.
SaleBestseller No. 3
Superior Labs - Pure L-Theanine Non-GMO, No Additives - 250mg, 90 Vegetable Capsules - Powerful...
  • HEALTHY MOOD, RELAXATION, CALMING - L-Theanine is an analog of the amino acids L-Glutamine and L-Glutamic Acid and is derived primarily from tea...
  • BEST VALUE - Powerful formula containing 250 mg and 90 vegetable capsules of pure L-Theanine.
  • ABSOLUTE PURITY - ZERO SYNTHETIC ADDITIVES, FILLERS, HEAVY METALS, ADULTERANTS - You will never see unnecessary additives such as stearates, dioxides,...
  • UNQUESTIONABLE QUALITY - ALL PRODUCTS PRODUCED IN 3rd PARTY CERTIFIED NSF CERTIFIED FACILITIES - Few are and can pass the stringent standards of NSF....
  • NO RISK AND NO HASSLE - For almost a decade, we have been delighting Amazon customers. If you are not satisfied with the benefits, results, or are...
Bestseller No. 4
Pure Original Ingredients L-Theanine (730 Capsules) No Magnesium Or Rice Fillers, Always Pure, Lab...
  • L-Theanine Capsules are filled with a single ingredient, providing a pure undiluted supplement
  • L-Theanine is a an amino acid analogue of L-Glutamate & L-Glutamine
  • Always Pure: No additives, stearates, or rice fillers
  • 365 Day Supply: 1 year of peak health support
  • Packaged in Utah, USA
Bestseller No. 5
Pure Original Ingredients L-Theanine (8 oz) Amino Acid Supplement, No Additives or Fillers
  • Pure Original Ingredients L-Theanine Powder is made from a single ingredient, providing a pure undiluted supplement
  • L-Theanine is an amino acid found in black and green tea and some mushrooms
  • L-Theanine is a supplemental amino acid
  • Always Pure; Never any additives or fillers
  • Packaged in Utah, USA
Bestseller No. 6
Pure Science L-Theanine Supplement 400 mg – Supports Cognition, Improves Mental Performance and...
  • BOOSTS COGNITION AND MENTAL PERFORMANCE: L theanine supplement promotes the generation of alpha waves, known to accompany periods of intense...
  • CALMS THE MIND: L-Theanine 400mg increases the production of GABA, an amino acid and neurotransmitter, which works to inhibit other neurotransmitters...
  • REDUCES STRESS AND PROMOTES FEELINGS OF WELL-BEING: L theanine capsules limit the neurochemicals which cause stress reactions. It helps ease negative...
  • GOOD MANUFACTURING PRACTICES CERTIFIED: Produced by GMP certified facilities with the highest manufacturing and sourcing standards of Pure Science....
  • MONEY-BACK GUARANTEE: As we are confident of the efficacy of Pure Science L-theanine vegan capsules, all purchases are backed by a 100% money-back...
Bestseller No. 7
L-Theanine Powder 8.8 Ounces (250g) - 100% Pure, Non-GMO, Gluten Free (Multiple Sizes) Mood and...
  • 🥄 SCOOP INCLUDED: Easily measure the recommended 200 mg dosage with the included anti-static 1/8 teaspoon scoop.
  • 🧪 THIRD-PARTY LAB TESTED: Tested in a US lab separate from the manufacturer to guarantee purity.
  • ☀️ MOOD AND RELAXATION: L-theanine promotes mood health and enhances relaxation. It supports a positive mood so that you can enjoy your day to its...
  • ☕ GOES GREAT WITH CAFFEINE: Eliminate caffeine jitters by taking a 2:1 ratio of L-theanine to caffeine. It makes an excellent partner to coffee or...
  • ✔️ 100% PURE L-THEANINE: No fillers or additives, just pure l-theanine powder packaged in an FDA registered facility.
Bestseller No. 8
NOW Supplements, L-Theanine Pure Powder, Tension Management*, Amino Acid, 1-Ounce
  • Promotes Relaxation*
  • Healthy Vascular Function*
  • Take 1/8 level teaspoon daily in juice or water, preferably on an empty stomach
  • GMP Quality Assured: NPA A-rated GMP certification means that every aspect of the NOW manufacturing process has been examined, including our...
  • Packaged in the USA by a family owned and operated company since 1968
Bestseller No. 9
VitaDirect Premium Pure L-Theanine Capsules 250 mg (Theanine), 120 Vegetarian Capsules, Non-GMO,...
  • Premium L-Theanine Capsules Providing A High Quality Dietary Supplement.
  • Gluten Free, High Quality Capsules, Third Party Tested For Quality.
  • Formulated and Made For an Easy To Swallow Capsule.
  • All VitaDirect Products Are Made In GMP Compliant and FDA Regulated Facility. Insuring The Best Practices.
  • 100% Satisfaction Guaranteed - If you're unsure about your purchase and don't see results, we'll refund your money for up to 30 days from purchase.
SaleBestseller No. 10
Pure Original Ingredients L-Theanine (365 Capsules) Amino Acid, No Magnesium or Rice Filler, Lab...
  • L-Theanine Capsules are filled with a single ingredient, providing a pure undiluted supplement
  • L-Theanine is a an amino acid analogue of L-Glutamate & L-Glutamine
  • Always Pure: No additives, stearates, or rice fillers
  • 365 Day Supply: 1 year of peak health support
  • Packaged in Utah, USA
Bestseller No. 11
Pure Lab Vitamins L-Theanine - 200 mg Slow Release Formula - 150 Vegan Caps - 75 Days Supply
  • ⚡RELAX & UNWIND
  • 💪FOCUS BOOSTER
  • ❤️HEALTHY IMMUNE SYSTEM
  • 🎯TAKES THE EDGE OFF - Our slow release capsules start delivering L-Theanine to body and brain within 20 minutes and maintain blood levels for 4 to...
  • Formulated and made in Canada
Bestseller No. 12
L-Theanine Powder 100g (500 Day Supply) 100% Pure, Non-GMO, Gluten Free, Mood and Cognitive...
  • 🥄 SCOOP INCLUDED: Easily measure the recommended 200 mg dosage with the included anti-static 1/8 teaspoon scoop.
  • 🧪 THIRD-PARTY LAB TESTED: Tested in a US lab separate from the manufacturer to guarantee purity.
  • ☀️ MOOD AND RELAXATION: L-theanine promotes mood health and enhances relaxation. It supports a positive mood so that you can enjoy your day to its...
  • ☕ GOES GREAT WITH CAFFEINE: Eliminate caffeine jitters by taking a 2:1 ratio of L-theanine to caffeine. It makes an excellent partner to coffee or...
  • ✔️ 100% PURE L-THEANINE: No fillers or additives, just pure l-theanine powder packaged in an FDA registered facility.
Bestseller No. 13
Amazing Nutrition L-Theanine Dietary Supplement * 200 mg Pure Veggie Capules * Promotes Relaxation...
  • ONE OF THE MOST IMPORTANT VITAL NUTRIENTS L theanine is an essential water-soluble amino acid required by the body to function properly. Amazing...
  • STRESS RELIEF WITHOUT SEDATION Theanine is known to be a natural relaxer that assists with relaxation and stress reduction without leaving you feeling...
  • THE NATURAL CHOICE Our pure l theanine supplement is free of artificial colors flavors, sweeteners and preservatives, making it the natural solution...
  • ll Amazing Formulas products are manufactured in accordance with Good Manufacturing Practices (GMP), among the highest standards in the...
  •  All our products are proudly made in USA with Guaranteed Purity & Potency. We offer best quality products for the best value. All our products are...
Bestseller No. 14
Stress Relief Supplement for Women and Men by Primal Harvest Pure Ashwagandha Root Extract,...
  • Our foundational ashwagandha root stress supplements are packed with 300mg of Prolanza ashwagandha extract, 150mg L-Theanine, 150mg Theobroma cocoa...
  • Natural Ayurveda Stress Relief: Ashwagandha is a powerful adaptogen that provides a quick natural way to help fight stress and negativity. Ashwagandha...
  • High Quality Manufacturing, Made in the USA: Each product undergoes vigorous lab testing at multiple stages. Incoming raw ingredients are tested for...
  • Money-back policy: We want you to be 100% satisfied with our products. If you're not entirely happy with your purchase, we will refund your money in...
SaleBestseller No. 15
Sports Research Double Strength ‘Suntheanine’ L-Theanine with Organic Coconut Oil - Promotes...
  • ALERT & CALM: L-Theanine is an amino acid commonly found in green tea and is believed to help with relaxation. Suntheanine is patented, researched,...
  • PREMIUM QUALITY: Sports Research is proud to offer products using only the best ingredients available so that you can have total peace of mind in the...
  • Our products are made in cGMP compliant facilities in the United States, using only the best ingredients from domestic & international origins. For...
  • EASY TO USE: As a dietary supplement, simply take one (1) easy to swallow liquid softgel daily with or without food or as directed by your qualified...
  • THE SPORTS RESEARCH DIFFERENCE: Created in 1980, Sports Research is a privately-owned business born from a passion for fitness, wellness, and healing....
Bestseller No. 16
NOW Supplements, L-Theanine 200 mg with Inositol, Stress Management*, 120 Veg Capsules
  • STRESS MANAGEMENT*/PROMOTES RELAXATION*: Promotes relaxation without the drowsiness or negative side effects associated with other calming agents.*
  • Product Note: Exposure to heat or sunlight may lead to melting/damage of product. Hence customers are expected to be available during the product...
  • HEALTHY VASCULAR FUNCTION*/WITH INOSITOL: Formulation includes inositol, a member of the B-vitamin family that is essential for brain and nervous...
  • CLASSIFICATIONS/CERTIFICATIONS: Vegan, Kosher, Non-GMO
  • GMP Quality Assured: NPA A-rated GMP certification means that every aspect of the NOW manufacturing process has been examined, including our...
Bestseller No. 17
Vital Nutrients - L-Theanine 200 mg - Supports Normal Stress Levels and Cognitive Function - 60...
  • Supports Stress Resistance: L-Theanine 200mg is a unique amino acid that occurs naturally in the tea plant, which may help ease occasional nervous...
  • Promotes Relaxation: This powerful formula assists a calm mood, and resiliency. It may also help with the quality of restful sleep, without promoting...
  • Supports Cognitive Function: L Theanine's benefits include increased alpha brain wave activity and supporting mental focus in healthy adults.*
  • Does Not Contain: This product is free from coatings, binders, gluten (wheat, rye, barley)*, milk/dairy (casein, whey)*, soy protein*, egg protein*,...
  • We test every ingredient we use and every finished product we make. FDA regulation (GMP Part 111) requires that manufacturers test ingredients and...
Bestseller No. 18
Klaire Labs L-Theanine - 100mg Suntheanine to Promote Promote Relaxation (60 Capsules)
  • Promote Relaxation - L-theanine is a unique amino acid compound found in green tea, and is noted for its calming benefits.*
  • Suntheanine Pure L-Theanine - Suntheanine brand pure L-theanine is produced through a patented manufacturing process. Studies with Suntheanine show it...
  • Neurotransmitter Support - L-theanine has been studied for its ability to reduce glutamate uptake and support the body's serotonin, dopamine, and...
  • Hypoallergenic* - Keeping sensitives in mind, this product is free of the following common allergens: milk/casein, eggs, fish, shellfish, tree nuts,...
  • Practitioner Trusted - Trusted by healthcare practitioners since 1969, Klaire Labs products are developed closely with physicians and are intended to...
Bestseller No. 19
Integrative Therapeutics L-Theanine 200 mg - Suntheanine Brand L-Theanine - Promotes a Relaxed State...
  • L-Theanine is an amino acid that supports a relaxed state without diminishing daytime alertness*
  • Suntheanine L-Theanine is an amino acid that helps support relaxation and a healthy stress response*
  • Clinically studied, L-theanine can support a healthy stress response*
  • Soy free, dairy free. No wheat, corn, or artificial colors, flavors, or preservatives
Bestseller No. 20
Pure Encapsulations Cortisol Calm | Supplement to Support Relaxation and Restful Sleep During Times...
  • Mild Stress Management Support: Maintains healthy cortisol levels and may help calm the nervous system under mild stressful conditions.*
  • Cognitive Health: This formula is designed to maintain healthy cortisol levels and to support relaxation, restful sleep, and a positive outlook during...
  • Positive Outlook Support: Rhodiola and magnolia may also maintain healthy adrenal cortisol activity and offer support for occasional stress.
  • Pure Quality: Our supplements are made with only premium ingredients sourced from trusted suppliers and guided by our nutritional experts, then...
  • Pure Difference: What makes us different isn't just our process or what goes into our supplements -- what we leave out matters, too. Pure...

Having trouble finding a great pure l theanine?

This problem is well understood by us because we have gone through the entire pure l theanine research process ourselves, which is why we have put together a comprehensive list of the best pure l theanines available in the market today.

After hours of searching and using all the models on the market, we have found the best pure l theanine for 2023. See our ranking below!

How Do You Buy The Best Pure L Theanine?

Do you get stressed out thinking about shopping for a great pure l theanine? Do doubts keep creeping into your mind?

We understand, because we’ve already gone through the whole process of researching pure l theanine, which is why we have assembled a comprehensive list of the greatest pure l theanine available in the current market. We’ve also come up with a list of questions that you probably have yourself.

John Harvards has done the best we can with our thoughts and recommendations, but it’s still crucial that you do thorough research on your own for pure l theanine that you consider buying. Your questions might include the following:

  • Is it worth buying an pure l theanine?
  • What benefits are there with buying an pure l theanine?
  • What factors deserve consideration when shopping for an effective pure l theanine?
  • Why is it crucial to invest in any pure l theanine, much less the best one?
  • Which pure l theanine are good in the current market?
  • Where can you find information like this about pure l theanine?

We’re convinced that you likely have far more questions than just these regarding pure l theanine, and the only real way to satisfy your need for knowledge is to get information from as many reputable online sources as you possibly can.

Potential sources can include buying guides for pure l theanine, rating websites, word-of-mouth testimonials, online forums, and product reviews. Thorough and mindful research is crucial to making sure you get your hands on the best-possible pure l theanine. Make sure that you are only using trustworthy and credible websites and sources.

John Harvards provides an pure l theanine buying guide, and the information is totally objective and authentic. We employ both AI and big data in proofreading the collected information.

How did we create this buying guide? We did it using a custom-created selection of algorithms that lets us manifest a top-10 list of the best available pure l theanine currently available on the market.

This technology we use to assemble our list depends on a variety of factors, including but not limited to the following:

  1. Brand Value: Every brand of pure l theanine has a value all its own. Most brands offer some sort of unique selling proposition that’s supposed to bring something different to the table than their competitors.
  2. Features: What bells and whistles matter for an pure l theanine?
  3. Specifications: How powerful they are can be measured.
  4. Product Value: This simply is how much bang for the buck you get from your pure l theanine.
  5. Customer Ratings: Number ratings grade pure l theanine objectively.
  6. Customer Reviews: Closely related to ratings, these paragraphs give you first-hand and detailed information from real-world users about their pure l theanine.
  7. Product Quality: You don’t always get what you pay for with an pure l theanine, sometimes less, and sometimes more.
  8. Product Reliability: How sturdy and durable an pure l theanine is should be an indication of how long it will work out for you.

John Harvards always remembers that maintaining pure l theanine information to stay current is a top priority, which is why we are constantly updating our websites. Learn more about us using online sources.

If you think that anything we present here regarding pure l theanine is irrelevant, incorrect, misleading, or erroneous, then please let us know promptly!

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FAQ:

Q: Can You overdose on L theanine?

A: There have been no reports of overdose or side effects of taking l theanine and drinking tea is generally safe for most people. By stimulating the production of more gaba as well as other important neurochemicals such as dopamine serotonin and norepinephrine l theanine steers the mind to naturally reduce anxious feelings and stress.

Q: Does L theanine work immediately?

A: The first thing I recommend you do if you want to make l theanine work faster is to take it on an empty stomach. Since the supplement has to travel through your stomach in order to be absorbed, it of course helps to not have anything in there. Now, this may not be the most practical tip if you want to take theanine for sudden anxiety attacks.

Q: What are the dangers of theanine?

A: – nausea – upset stomach – irritability

Q: When to take theanine serene?

A: Theanine Serene with Relora features powerful combinations of herbal extracts known to alleviate mild anxiety and stress naturally It can help the body to become resilient to stress while controlling certain hormones in the body to not over react thus calming the central nervous system Affordable than most natural anti-stress supplements