Best L-Theanine Amino Acid Supplements of 2026

Nature's Trove L-Theanine Capsules are made from natural ingredients found in green tea that promotes relaxation without drowsiness. It restores a sense of calm to help you unwind after a long day. The capsules are made in the USA in a GMP NSF certified facility and are kosher certified. You can also save more by selecting the super value size which comes with 365 vegetarian capsules.

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.

The Natural Factors L-Theanine supplement is designed to help you stay calm and relaxed without making you feel sleepy. It supports better sleep quality, helping you enjoy more restful nights so you can wake up refreshed and ready for the day. You can take 1 to 2 chewable tablets up to three times daily, making it easy to fit into your routine. Plus, it’s made without common allergens like dairy, gluten, soy, and nuts, so it’s a safe choice for many people seeking natural calming support.

Clean Nutraceuticals CalmAgain is an advanced all-in-one supplement that combines GABA, L-Theanine, Ashwagandha, 5-HTP, L-Tryptophan, SAM-e, L-Glycine, Vitamin D3, Vitamin B6, Magnesium Glycinate, and L Tyrosine into one convenient solution. With larger dosages of GABA Powder (750mg), L-Theanine (200mg), and 5-HTP (200mg) than other supplements in the market, Clean CalmAgain is a powerful mood support and balance support complex. The product is perfect for those who are looking for a supplement that can help them manage stress, anxiety, and improve their overall mood. Clean CalmAgain is made with vetted and trusted ingredients and is proudly made in the USA in a registered and certified facility.

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.

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.

Pure Encapsulations L-Theanine is designed to help you relax without making you feel sleepy. This amino acid supplement can ease occasional feelings of nervousness and irritability, offering support when you’re dealing with stress. It also helps balance out the effects of caffeine, so you can stay calm and focused. Made with pure ingredients, this supplement avoids unnecessary additives and common allergens, making it a clean choice for your wellness routine. If you want a natural way to support your nervous system and stress levels, Pure Encapsulations L-Theanine is a solid option.

Doctor's Best L-Theanine is a high-quality supplement that contains Suntheanine, a pure form of L-Theanine. L-Theanine is known for its ability to promote a healthy mood and a relaxed state while maintaining daytime alertness. This amino acid found naturally in tea supports relaxation, focus, and memory without causing drowsiness. It also supports brain health by enhancing cognitive performance and alertness. Additionally, L-Theanine may help improve the quality of sleep, concentration, and learning performance. With its ability to reduce stress and support mental tranquility, Doctor's Best L-Theanine is a great addition to your daily routine.

Double Wood L-Theanine Capsules are a third-party tested and manufactured supplement in the USA. These capsules support relaxation without causing drowsiness, making them perfect for those who need to stay calm while maintaining mental sharpness. With the convenience of being Non-GMO and Gluten Free, Double Wood L-Theanine capsules provide a natural way to promote relaxation. Additionally, they work synergistically with Magnesium L-Threonate and Apigenin for enhanced results. Take this supplement to experience the benefits of relaxation and sleep support in your daily life.

Ultima Daily Focus Powder is designed to keep you hydrated and sharp throughout the day. It contains six essential electrolytes that help maintain your body's balance without adding sugar, calories, or carbs, making it a healthy choice for daily hydration. The powder includes antioxidants from acai and blueberry, which support brain health. It also features caffeine and L-Theanine, which work together to boost your focus while keeping you calm. Conveniently packaged in 14 stickpacks, you can easily mix one with water on the go to improve concentration whenever you need it.