10 Best L Theanine Magnesium of 2025

Tested and Reviewed: Top 10 L Theanine Magnesium deals with expert ratings from 8.1 to a perfect 10

May 2026 Edition

Editor's Choice

9.7

Nutricost

Nutricost L-Theanine 200mg, 120 Capsules, Double Strength - Non-GMO, Gluten Free

Editor's bottom line:

“This l theanine magnesium is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

120 Capsules of L-Theanine Per Bottle
200mg L-Theanine Per Serving (120 Servings)
Easy To Take Capsules
Non-GMO, Gluten Free
Manufactured In a NSF Certified, GMP Compliant, FDA Registered Facility

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Picked by 397 people today

9.5

Double Wood Supplements

Magnesium L Threonate, Magtein - NSF Certified - Sleep and Cognitive Support – High Absorption – Most Bioavailable Form of Magnesium – 2,000 mg – 120 Capsules

Main Highlights

ONLY FORM OF MAGNESIUM ABLE TO SUPPORT MAGNESIUM LEVELS IN THE BRAIN: Magtein Magnesium L-Threonate is a unique magnesium breakthrough supplement and the only form of magnesium clinically proven to support magnesium levels in the brain
CLINICALLY STUDIED FOR COGNITIVE WELLNESS: Magnesium L-Threonate has been studied for its role in supporting memory, learning, and overall cognitive performance.
HIGHLY BIOAVAILABLE FORM OF MAGNESIUM: L-Threonate is a mineral chelating agent that is able to greatly enhance the bioavailability of magnesium making it highly absorbable
MAGNESIUM FOR SLEEP: Magnesium Threonate is commonly taken alongside L-Theanine and Apigenin in a sleep cocktail for nighttime assistance
WE BOTTLE WELLNESS: At Double Wood we provide pure, potent supplements that deliver exceptional value, all backed by careful sourcing and rigorous third-party testing

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9.5

Evlution

Magnesium L Theanine Supplement - Evlution Nutrition Mind & Body Calming Magnesium with L-Theanine Blend to Support Focus Relaxation & Cortisol - Vegan Non-GMO & Gelatin Free (45 Servings)

Main Highlights

Science Based Formula - Try the EVL Magnesium + L-Theanine dietary supplement that is formulated to ensure every capsule encapsulates the essence of relaxation, restoration and focus support. This supplement is a great addition to your daily routine.
Magnesium + L-Theanine - EVLs Magnesium + L-Theanine formula combines Magnesium and L-Theanine to offer a convenient yet effective dietary supplement. These veggie capsules are designed to help support overall relaxation and focus in your daily life.
Veggie Capsules - Our Magnesium + L-Theanine dietary supplement contains 200mg of Magnesium and 100mg of L-Theanine per serving. This magnesium and l-theanine supplement for men and women comes in convenient veggie capsules.
Quality Ingredients - Were proud to use some of the finest ingredients for peak performance. Our Magnesium + L-Theanine supplement is vegan, non-GMO and free of unnecessary additives. As a dietary supplement, take 2 veggie capsules daily, preferably with a meal or as recommended by a physician.
Why EVL - EVL is a leading name in full stack supplements because we take our quality seriously and only use the finest lab tested performance maximizing ingredients.

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9.2

Plus+Ultra

Magnesium L-Threonate with Apigenin, Valerian Root & L-Theanine – No Melatonin Restful Sleep & Brain Supplement – Clinically Studied 7-Ingredient Formula – Memory & Focus – 60 Capsules

Main Highlights

THE COMPLETE MAGNESIUM THREONATE SLEEP STACK WITH LIPOSOMAL DELIVERY: Dosed for deep sleep and brain recovery: 1050mg Liposomal Magnesium Complex (Magnesium L-Threonate + Phosphatidylserine), 200mg L-Theanine, 100mg Chamomile Extract (10:1), 100mg Valerian Root Extract (10:1), 50mg Apigenin.* A pharmacist-formulated blend for calm, clarity, and deep sleep.*
BOOST SLEEP, MEMORY, FOCUS ?ND COGNITIVE FUNCTION: Powered by Magnesium L-Threonate and Phosphatidylserine, MAGPLUS+ supports mental clarity, learning, and recall, helping you stay sharp and focused throughout the day no melatonin, no grogginess.*
MADE IN THE USA CLEAN AND HIGH-QUALITY FORMULA: Proudly Made in the USA in a cGMP-certified facility, MagPlus+ is non-GMO, vegan-friendly, soy-free, sugar-free, gluten-free, and free of artificial additivescrafted for purity, potency, and performance you can trustwith a full 30-day supply of premium, effective ingredients.*
SCIENTIFICALLY-BACKED INGREDIENTS FOR BRAIN HEALTH: Our formula features clinically researched ingredients like Magnesium L-Threonate, Chamomile Flower Powder, and Phosphatidylserine, designed to support brain cell function, neurotransmitter balance, and long-term cognitive health.*
RELAX AND SLEEP DEEPE? WITH NATURAL SUPPORT: Apigenin, L-Theanine, and Valerian Root work together to promote relaxation and enhance sleep quality, so you wake up feeling refreshed and recharged.*

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9.0

Micro Ingredients

L-Theanine 200mg with Magnesium Glycinate, 400 Coconut MCT Oil Softgels | 2-in-1 Amino Acid & Mineral Complex | Gentle Care All Day & Night

Main Highlights

Micro Ingredients offers 2-in-1 L-Theanine with Magnesium Glycinatecoconut oil softgels. A well-absorbed formula combining natural amino acidsand minerals.
Each pouch offers 400 easy-to-consume softgels infused with coconut andMCT oil. A long-lasting 200-serving supply, delivering 200mg L-Theanine and200mg Magnesium Glycinate per serving.
L-Theanine and magnesium glycinate are important micronutrients thatwork together to support muscle health, relaxation, and focus. Take it in themorning or at night to enjoy their benefits.
High bioavailable theanine and magnesium forms for easy digestion. Theaddition of MCT coconut oil offers an easily absorbed healthy carrier foroptimal absorption of nutrients.
Premium non-GMO L-Theanine supplements. Made without soy, dairy, andgluten. Ingredients must pass our 3rd party lab tests to ensure a product thatis safe, pure, and potent.

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8.8

Life Extension

Life Extension Neuro-Mag Magnesium L-Threonate, Memory Health, Quick Thinking, Cognitive Health Support, Vegetarian, Non-GMO, 90 Vegetarian Capsules (144 mg from 2000 mg Magtein magnesium L-threonate

Main Highlights

Quick thinking: Want to stay sharp? Try magnesium L-threonate: this form of magnesium helped maintain executive function and quick thinking in clinical studies.
Short-term memory: magnesium L-threonate helps support your working or short term memory health, so you dont forget where you put your car keys, etc.
Cognitive health: magnesium plays an important role in your brain, supporting cognitive function. Magnesium L-Threonate is a special form of magnesium well-studied for cognitive health.
Ingredients matter We use the finest raw ingredients chosen for quality and purity. The majority of our products are non-GMO, gluten-free and manufactured in the USA with globally sourced ingredients, and a Certificate of Analysis is available for each.
Live your healthiest life - For over 40 years, weve been developing advanced, effective formulas made with the highest standards and based on the latest scientific findings. We believe the answers to a healthier, richer life are within reach, and that rigorous scientific research is the path to get us there. Thats why so many of our nutritional formulas are designed using specific ingredients and amounts based on scientific studies.

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8.6

Sports Research

Sports Research® Magnesium L-Threonate Capsules 2000mg - High-Absorption Magtein® for Enhanced Brain Health, Memory, Focus & Restful Sleep Support - Vegan · Non-GMO · Gluten Free - 90 Count

Main Highlights

HIGHLY BIOAVAILABLE FORM: Magnesium L-threonate is the salt formed from mixing magnesium and threonic acid, a water-soluble substance derived from the metabolic breakdown of vitamin C. Easily absorbed, our magnesium L threonate capsules are used for their overall brain health benefits and may help support memory, focus, relaxation, mood, and cognition.
MADE WITH MAGTEIN: Magtein is a patented compound called threonic acid developed by a group of MIT researchers. Magtein is the only form that effectively crosses the blood-brain barrier and increases magnesium levels in the brain, which is critical for improving cognitive function. Our easy-to-swallow Magtein magnesium L-threonate veggie capsules are the easiest, most convenient way to add this essential mineral to your daily diet.
PREMIUM QUALITY: Sports Research takes pride in offering products that use only the best ingredients available so that you can have total peace of mind in the supplements that you are taking. Our magnesium supplement is verified non-GMO and free of gluten and gelatin.
MANUFACTURED IN THE USA: Our products are made in cGMP compliant facilities in the United States, using only the best ingredients from domestic & international origins. For us, it's all about quality control - so you can have confidence in your dietary supplements. We offer ninety (90) magnesium pills for a one (1) month supply. Reap all the benefits of this powerful and healthy magnesium threonate supplement!
THE SPORTS RESEARCH DIFFERENCE: Created in 1980, Sports Research is a privately-owned business born from a passion for fitness, wellness, and healing. Our goal is to help people live their best lives through real, research-backed ingredients created for every body inside and out.

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8.3

DEAL SUPPLEMENT

L-Theanine with Magnesium Glycinate, 360 Softgels | L-Theanine 200mg & Magnesium Glycinate 200mg per Serving | 2-in-1 Amino Acid & Mineral Complex | Made with Coconut Oil | Non-GMO, cGMP Manufactured

Main Highlights

L-Theanine & Magnesium Glycinate Formula Combines L-Theanine and magnesium glycinate together in one formula, delivered in an easy-to-take softgel format.
Benefits & Use L-Theanine is an amino acid naturally found in green tea, while magnesium glycinate is a chelated form of magnesium commonly used in dietary supplements. This combination is frequently included in everyday supplement routines.
Dosage & Serving Size Delivers 200 mg of L-Theanine and 200 mg of magnesium glycinate per 2-softgel serving, formulated with coconut oil. Each bottle contains 360 softgels, providing up to a 180-day supply.
Quality Ensured Made with non-GMO ingredients in a cGMP compliant facility and free from gluten, soy, and dairy. Third-party lab tested for safety, purity, and potency.
These statements have not been evaluated by the FDA. This product is not intended to diagnose, treat, cure, or prevent any disease.

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8.1

Source Naturals

Source Naturals Serene Science L-Theanine with Magnesium and GABA - 120 Tablets

Main Highlights

Serene Science Theanine Serene contains the amino acid L-theanine, to support relaxation and focused attention, and the calming neurotransmitter GABA.
Suggested Use: 2 tablets daily.
Suitable for vegetarians. Contains no yeast, dairy, egg, gluten, soy or wheat. Contains no sugar, preservatives or artificial color, flavor or fragrance.
Over 40 years of trust. source naturals was created in 1982 by ceo ira goldberg to support everyones potential to enjoy optimal health.
Manufactured in the USA. Manufactured in Scotts Valley, CA, under the Good Manufacturing Practices (cGMPs) established by the US Food and Drug Administration. (FDA)

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8.1

Force Factor

Force Factor Magnesium + L-Theanine, Magnesium Bisglycinate Supplement to Support Bones, Muscles, Nerves, Relaxation, and Mood, Vegan, No Gelatin, Non-GMO, 120 Vegetable Capsules

Main Highlights

CONVENIENT 2-IN-1 RELAXATION SUPPORT: Every dose may help you relax tense muscles, calm your mind, and unwind with the naturally soothing 2-in-1 power of magnesium and L-theanine in one convenient formula.
PROMOTES RESTFUL SLEEP: Magnesium may help support muscle relaxation while L-Theanine enhances calm and may improve sleep quality without drowsiness.*
SUPPORTS BONE HEALTH & MUSCLE RECOVERY: Every dose provides a potent dose of magnesium bisglycinate to promote strong bones, and support health muscle function and recovery.
PREMIUM QUALITY & VEGAN FRIENDLY: With no artificial colors, artificial flavors, or gelatin, you can rest assured that youre choosing a high-quality, better-for-you magnesium + L-theanine supplement.
MADE IN THE USA: Force Factor Magnesium + L-Theanine is made in America in GMP-certified manufacturing facilities to ensure quality and safety. All of our ingredients go through rigorous testing to validate their potency and purity.

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Our Best Overall Choice

Best Choice

9.7

Nutricost

Nutricost L-Theanine 200mg, 120 Capsules, Double Strength - Non-GMO, Gluten Free

Editor's bottom line:

“This is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

120 Capsules of L-Theanine Per Bottle
200mg L-Theanine Per Serving (120 Servings)
Easy To Take Capsules
Non-GMO, Gluten Free
Manufactured In a NSF Certified, GMP Compliant, FDA Registered Facility

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