Best L-Theanine Amino Acid Supplements of 2025

Life Extension L-Theanine promotes relaxation, calmness, and mood enhancement. Its main ingredient is an amino acid derived from tea that modulates the formation of neurotransmitters GABA, dopamine, and serotonin, which regulate mood and stress levels. Its calming effects encourage brainwave patterns similar to meditation and massage. The product is non-GMO, gluten-free and manufactured in the USA. It is developed using the latest scientific findings and formulated to achieve maximum bioavailability and efficacy.

The Sports Research Double Strength ‘Suntheanine’ L-Theanine with Organic Coconut Oil supplement promotes an alert and calm state of mind. Each softgel capsule contains 200mg of L-Theanine that is clinically proven to promote relaxation and focus without drowsiness. Made using the best ingredients available, it is certified non-GMO and free of soy, gluten, and artificial colors. With easy-to-swallow softgel capsules, it is a convenient way to increase Alpha brain waves and decrease Beta brain waves. Made in cGMP compliant facilities in the USA.

Pure Encapsulations L-Theanine is an amino acid derived from green tea, recognized for its relaxant properties that ease occasional nervous tension and irritability, promote relaxation without causing drowsiness and moderate the effects of caffeine on the central nervous system. It is made with only premium ingredients that are free from wheat, eggs, tree nuts & peanuts, gluten, artificial colors, flavors & sweeteners, coatings and shellacs, GMOs, and unnecessary binders, fillers & preservatives.

Nature's Trove L-Theanine offers a super value size with 365 vegetarian capsules, ideal for those seeking relaxation. Each capsule contains 200mg of L-Theanine, which may help you unwind without causing drowsiness. This supplement is derived from green tea, providing a natural source of calmness. With its focus on natural ingredients, you can feel good about what you’re putting into your body. Additionally, it is made in the USA in a certified facility, ensuring high-quality production standards for your peace of mind.

Boost your productivity and stay focused with BULKSUPPLEMENTS.COM L-Theanine Powder. This amino acid supplement helps improve concentration and alertness, making it perfect for those who want to be productive without taking multiple supplements. Additionally, it supports immune health and overall wellness, making it suitable for both men and women. The pure and gluten-free formula ensures no unwanted extras, allowing you to relax worry-free. Whether you add it to smoothies or other recipes, this L-Theanine powder is a simple and natural way to promote well-being. With high-quality manufacturing and third-party testing, you can trust the superior quality of BULKSUPPLEMENTS.COM L-Theanine Powder.

Nutricost L-Theanine Capsules offer a convenient way to enhance your relaxation and focus. Each bottle contains 240 capsules, each packed with 200mg of L-Theanine, providing you with a double strength option for effective support. These easy-to-take capsules are perfect for those who prefer not to deal with powders or liquids. Plus, they are made without GMOs and gluten, catering to various dietary needs. Manufactured in a facility compliant with GMP and registered with the FDA, you can trust the quality and safety of these supplements.

XYMOGEN L-Theanine is a powerful amino acid supplement that promotes calm and relaxation without causing drowsiness. It contains 400mg of L-theanine per serving, a naturally occurring amino acid found in green tea leaves. This supplement is formulated to support occasional stress management, reducing nervousness and irritability caused by overwork and fatigue. Additionally, it may offer liver support and help reduce negative side effects from caffeine. XYMOGEN L-Theanine is free from common allergens and artificial preservatives, making it a trusted choice for relaxation support and overall well-being.

Metabolic Maintenance L-Theanine Supplement contains 200mg of suntheanine L-Theanine, an amino acid found in green tea, which may support relaxation, immune system, and healthy dopamine levels. It is free of fillers, binders, preservatives, gluten, egg, nuts, and magnesium stearate. The supplement is available in 200mg and 100mg capsules, and it has been a physician's choice since 1984, backed by clinical studies and third-party testing.

Thorne Theanine is an amino acid supplement that supports relaxation, focus, and memory by enhancing alpha-wave production in the brain. It also enhances GABA production in the brain, which acts as a brake during times of runaway stress. The product is free from gluten and other major allergens, including soy, dairy, shellfish, and fish.

EAZGOO L-Theanine Supplement offers 200mg of L-theanine to help you relax and manage stress effectively. This natural amino acid, derived from high-quality green tea, is designed to alleviate both mental and physical tension, making it easier for you to cope with daily challenges. The capsules are easy to swallow, ensuring that you can easily incorporate them into your routine. Plus, they are vegetarian and free from common allergens, making them a suitable choice for various dietary preferences.