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2025's Top 10 L-Theanine Supplements
Find out what to look for in a quality L-Theanine supplement and what to watch out for
What is L-Theanine?
L-theanine is an amino acid found in green and black tea. It is known as a “therapeutic” amino acid because it facilitates relaxation. When paired with caffeine, it may also provide a boost to focus and attention.
Benefits of L-Theanine
✔️ Stress and Anxiety Relief
L-theanine may boost levels of the neurotransmitter GABA. Low levels of GABA have been linked to higher levels of stress and anxiety.
✔️ Improved Sleep Quality
L-theanine can help combat the sleep-hindering effects of caffeine. Caffeine has a half-life of about 5 hours, meaning that if you drink a can of coke (34 mg caffeine) at 6pm, there will still be 17 mg floating around in your system at 11pm. Residual caffeine in the bloodstream can make falling asleep more difficult and cause sleep disruptions.
✔️ Improved Mental Focus
A study conducted with over 40 young adults concluded that even a small dose of L-Theanine can noticeably improve certain aspects of cognitive function. Subjects given a combination of 97mg L-theanine and 40mg caffeine showed improved ability to focus, alertness, blood pressure, and heart rate before and after 70 minutes of taking L-Theanine.
✔️ Fortified Immune System
L-theanine has been shown to bolster immune activity in active individuals. Strenuous physical exercise can often weaken the immune system by disturbing the Th1/Th2 balance – a cellular balance that protects the body from viral and bacterial pathogens. L-theanine restores the body’s Th1/Th2 balance, enabling a robust immune response.
Potential Side Effects
L-theanine is generally considered safe. In a small minority of cases, minor side effects such as nausea, upset stomach, and irritability may occur.
2025's Top 10 L-Theanine Supplements
1. Quality
All the products we recommend have been third party tested to ensure they meet our high standards of quality.
2. Cost
Getting your hands on a high quality supplement doesn’t have to break the bank. While our top priority will always be quality, we understand that price factors into many people’s buying decisions.
3. Brand Reputation
To ensure that your buying experience is a pleasant one, we recommend only products from companies with strong reputations for providing quality customer service and prompt shipping.
OVERALL RATING
🥇 TS.com Top Seller!
🥇 TS.com User Top Choice!
Nutricost L-Theanine is the #1 Rated L-Theanine Supplement, as it is high quality and half the price of its competitors. Nutricost L-Theanine features 200mg of L-Theanine in each serving. Click Here for Lowest Price
Uniquely, Nutricost is one of the few companies that control the full chain of manufacturing, from sourcing to manufacturing in an FDA-registered facility to warehousing and fulfillment, ensuring strict quality standards are met. Nutricost also offers exceptional customer support for all of its products.
Priced under $16, Nutricost L-Theanine comes with 500 servings, which is just $.03 per serving. With Nutricost, you can be assured that this product does NOT contain ANY extra ingredients, fillers, or preservatives.
Nutricost L-Theanine comes with a 120-day, no-questions-asked, money-back guarantee – the best guarantee on the market!
- Amazon's Choice
- Only $0.10 per serving
- 200mg of L-Theanine in each capsule
- Non-GMO, gluten-free, and made in the USA!
- No artificial colors, flavors, or chemical preservatives
- 120-day, no-questions-asked, money-back guarantee!
*Individual Results May Vary - Ratings are based on Society Health Ranking System and do not necessarily reflect typical results from the use of these products. We encourage consumers to research by visiting each product's website for more information.
- Unlock your mental prowess: Enhance your cognitive abilities and unleash your full mental potential with Primal L-Theanine Capsules.
- 120 servings of excellence: Each bottle of Primal L-Theanine contains 120 capsules, providing you with a generous supply to fuel your journey to peak mental performance.
- Convenience at your fingertips: With 120 easy to swallow capsules per bottle, Primal L-Theanine Capsules offer a long-lasting supply, providing you with a hassle-free solution for sustained support.
- Embrace the power of nature: Derived from natural sources, L-Theanine is a naturally occurring amino acid known for its calming and cognitive-enhancing properties.
- Premium quality you can trust: Our product is proudly manufactured in an NSF Certified, GMP Compliant facility, ensuring the highest standards of quality and purity.
*Individual Results May Vary - Ratings are based on Society Health Ranking System and do not necessarily reflect typical results from the use of these products. We encourage consumers to research by visiting each product's website for more information.
- Relaxation: Promotes relaxation, focus, and memory by enhancing alpha-wave production in the brain*
- Stress: Supports a healthy stress response*
- GABA: Enhances GABA production in the brain (a brain chemical that acts like a brake during times of runaway stress)*
- Free From: Every Thorne product is made with the purest possible ingredients - without gluten or other major allergens (eggs, tree nuts, peanuts) This product also contains no soy, dairy, shellfish, or fish
- Thorne's commitment to integrity and science-backed products has helped us earn the trust of thousands of health-care professionals, U.S. National Teams, the Mayo Clinic, and families around the world
*Individual Results May Vary - Ratings are based on Society Health Ranking System and do not necessarily reflect typical results from the use of these products. We encourage consumers to research by visiting each product's website for more information.
- Doctor’s Best L-Theanine contains Suntheanine, a pure form of L-Theanine on the market produced via a patented process that mimics the natural process in green tea leaves.
- L-Theanine helps promote a healthy mood and a restful relaxed state while maintaining daytime alertness
- L-Theanine supports relaxation and a sense of calm without causing drowsiness or loss of focus. This amino acid found naturally in tea helps support healthy stress response, relaxation, focus and memory
- L-Theanine is a powerful Amino Acid that enhances cognitive performance and alertness. L-Theanine may help improve quality of sleep, learning performance, concentration and help support the immune system. L-Theanine may also help reduce the negative effects of caffeine
- L-theanine is an agent that is used for nervousness and tension by supporting mental tranquility. Suntheanine may normalize the body’s stress response and condition the body to handle stressful situations better
*Individual Results May Vary - Ratings are based on Society Health Ranking System and do not necessarily reflect typical results from the use of these products. We encourage consumers to research by visiting each product's website for more information.
- 200mg of L-Theanine Per Serving (500 Servings)
- Serving Size: 1 Scoop (Included)
- 100 Grams of L-Theanine Per Bottle
- Gluten Free and Non-GMO
- Manufactured In a GMP Compliant, FDA Registered Facility
*Individual Results May Vary - Ratings are based on Society Health Ranking System and do not necessarily reflect typical results from the use of these products. We encourage consumers to research by visiting each product's website for more information.
- QUALITY - Professionally manufactured in a cGMP registered facility in USA and thoroughly tested
- AUTHENTIC - Expertly formulated without any chemical preservatives or unnecessary filler ingredients
- HIGH-GRADE - Encapsulated using high-grade vegetable cellulose for optimal absorption & performance
- SATISFACTION - Enjoy peace of mind with our 180-days (6 months), no questions asked, full refund policy
*Individual Results May Vary - Ratings are based on Society Health Ranking System and do not necessarily reflect typical results from the use of these products. We encourage consumers to research by visiting each product's website for more information.
- STRESS MANAGEMENT*/PROMOTES RELAXATION*: Promotes relaxation without the drowsiness or negative side effects associated with other calming agents.*
- HEALTHY VASCULAR FUNCTION*/WITH INOSITOL: Formulation includes inositol, a member of the B-vitamin family that is essential for brain and nervous system health.*
- 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 laboratory/testing methods (for stability, potency, and product formulation).
- Packaged in the USA by a family owned and operated company since 1968.
*Individual Results May Vary - Ratings are based on Society Health Ranking System and do not necessarily reflect typical results from the use of these products. We encourage consumers to research by visiting each product's website for more information.
- ALERT STATE OF RELAXATION WITHOUT DROWSINESS - LTheanine is an Amino Acid derived from Green Tea that Enhances Mental Clarity & Focus, Helps Moderate Occasional Stress + Anxiety & Helps to Prevent Jitters Caused from Too Much Caffeine Consumption.
- DON'T SETTLE FOR 200MG L-THEANINE POWDER CAPSULES - Advanced Formula Extra Strength 250mg L-Theanine Liquid Softgels Made With Organic Flaxseed Oil For Superior Absorption & Extra Brain Support.
- NO BS (Bad Stuff) - Gluten, Corn, Eggs, Milk, Wheat, Peanut, Maltodextrin, Soy, Lactose, Carrageenan, Magnesium Stearate, or Dioxides.
- SMARTERVITAMINS - We're creating the future of supplements, today.
*Individual Results May Vary - Ratings are based on Society Health Ranking System and do not necessarily reflect typical results from the use of these products. We encourage consumers to research by visiting each product's website for more information.
- LASTING CALMNESS - L Theanine is known for reducing stress and promoting relaxation without sedation
- SUPPORTS BRAIN HEALTH - L-Theanine is a powerful Amino Acid that is derived from green & black tea. Many people take L-Theanine supplements to help reduce the negative effects of caffeine. L-Theanine is also taken to help with focus & cognition, promote stress relief and relaxation, may help decrease anxiety, and promote improved sleep quality. *
- HIGHEST QUALITY FORMULA - Best ingredients available. Manufactured at FDA cGMP certified facility.
- HIGHLY REGARDED AND RECOGNIZED - Our Products Have Been Consistently Recommended By The Foremost Nutritional Scientists Like Nobel Prize Winner, Dr. Linus Pauling
- WORKS OR YOUR MONEY BACK We back our products up with a 365-day hassle-free money back guarantee. There's no risk when you order now!
*Individual Results May Vary - Ratings are based on Society Health Ranking System and do not necessarily reflect typical results from the use of these products. We encourage consumers to research by visiting each product's website for more information.
- L-Theanine Capsules
- Supports Alpha-Wave Generation
- A Unique Relaxant Prominent in Tea
- Exerts protective effects on the brain by mitigating glutamate toxicity
*Individual Results May Vary - Ratings are based on Society Health Ranking System and do not necessarily reflect typical results from the use of these products. We encourage consumers to research by visiting each product's website for more information.
Sources
https://pubmed.ncbi.nlm.nih.gov/15569888/
https://agris.fao.org/agris-search/search.do?recordID=JP1998003883
https://www.sciencedirect.com/science/article/abs/pii/S0091305712000123
https://pubmed.ncbi.nlm.nih.gov/22214254/
https://www.tandfonline.com/doi/abs/10.1179/147683010X12611460764840
https://www.liebertpub.com/doi/pdf/10.1089/10762800151125092
https://aspenjournals.onlinelibrary.wiley.com/doi/full/10.1177/0148607112458798