Best 8 L-Theanine Supplements for Focus, Calm, and Sleep 2026

Your mind won’t stop racing at 11 p.m., even though your body is exhausted.

Or maybe it’s the opposite — you’re wired on coffee by 10 a.m., jittery and unable to focus, dreading the crash that’s coming by lunch.

L-theanine has become one of the most researched calming amino acids precisely because it addresses both problems without sedating you. Found naturally in green tea, it works by increasing alpha brain wave activity linked to relaxed alertness, rather than shutting the mind down.

Not every L-theanine supplement is formulated, dosed, or tested the same way, though. This guide breaks down eight closely evaluated options — comparing dose, certifications, and real customer feedback — so you can choose the formula that actually fits your stress, focus, or sleep goals.

Our Top Picks for L-Theanine Supplements

Best Overall: Nature’s Trove L-Theanine 200mg — Over 27,000 ratings, Non-GMO verified, and one of the lowest costs per serving.

Best Budget: Nutricost L-Theanine 200mg — NSF-certified facility, single-ingredient formula, and one of the most affordable options tested.

Best for Daytime Focus: Sports Research L-Theanine 200mg — Patented Suntheanine® in an organic coconut oil softgel for smooth, jitter-free daytime focus.

Best High-Dose: NUTRAHARMONY L-Theanine 400mg — Double-strength 400 mg serving for users needing stronger calming and sleep support.

Best Clinically-Backed: Integrative Therapeutics L-Theanine — Practitioner-formulated with 25+ years of clinical research behind its stress-response claims.

Best Liquid: MaryRuth’s L-Theanine Liquid Drops — Fast-absorbing liquid drops with Clean Label Project purity certification and pleasant flavor.

Best for Nootropic Stacks: Double Wood L-Theanine 200mg — Highest-rated pick in this roundup, built to stack with other nootropic ingredients.

Best 2-in-1 Formula: Micro Ingredients L-Theanine + Magnesium Glycinate — Combines L-theanine with magnesium glycinate in one softgel for layered sleep support.

Comparison Table

Rank	Product	Form	Price/Serving	Best For
1	Nature’s Trove L-Theanine 200mg	Capsule	$0.07	Daily users wanting a high-volume, low-cost pure L-theanine supply
2	Nutricost L-Theanine 200mg	Capsule	$0.10	Budget-conscious buyers seeking a simple, NSF-tested single-ingredient formula
3	Sports Research L-Theanine 200mg	Softgel	$0.32	Professionals wanting clinically studied Suntheanine® for daytime focus
4	NUTRAHARMONY L-Theanine 400mg	Capsule	$0.33	Adults needing a stronger dose for higher stress or sleep needs
5	Integrative Therapeutics L-Theanine	Capsule	$0.73	Buyers who prioritize practitioner-grade, clinically researched formulas
6	MaryRuth’s L-Theanine Liquid Drops	Liquid	$0.73	People who prefer liquid drops over capsules, including teens
7	Double Wood L-Theanine 200mg	Capsule	$0.17	Biohackers stacking L-theanine with other nootropics
8	Micro Ingredients L-Theanine + Magnesium Glycinate	Softgel	$0.12	Anyone wanting L-theanine and magnesium glycinate combined in one softgel

1. Nature’s Trove L-Theanine 200mg (365 Capsules) — Best Overall

Price: $27.15 (as of September 19, 2026)

With the largest review base in this roundup and a 365-capsule bottle, Nature’s Trove delivers pure L-theanine at one of the lowest costs per serving on the market.

Key Specs

• Active ingredient + form: L-Theanine, vegetarian capsule
• Dose per serving: 200 mg
• Certifications: Non-GMO Project Verified, GMP-certified, Kosher, ConsumerLab-tested ingredient
• Third-party tested: Yes
• Servings per container: 365
• Price per serving: $0.07 (calculated manually, Price as of September 19, 2026)

Key Benefits

Supports relaxation and calm without drowsiness, helps ease occasional anxiety, and promotes more consistent sleep onset when taken in the evening.

Key Ingredients

• L-Theanine (200 mg): a naturally-occurring amino acid found in green tea that promotes relaxation by increasing alpha brain wave activity without inducing drowsiness.

Pros

• Backed by over 27,000 Amazon ratings, among the highest review volume in this category
• ConsumerLab-tested ingredient with Non-GMO Project Verification
• Large 365-count bottle brings cost down to $0.07 per serving

Cons

• No secondary calming ingredients (pure single-ingredient formula)
• A small share of users reported nausea or heartburn

Best Suited For

Best suited for daily users who want a high-volume, budget-friendly supply of pure L-theanine backed by extensive verified customer feedback.

Usage Recommendations

Take 1 capsule (200 mg) daily, with or without food. Many users take it in the evening for sleep support or pair it with morning coffee to reduce jitters.

Customer Feedback

Most reviewers report the capsules ease anxiety and support more consistent sleep, with many falling asleep faster and staying relaxed without feeling groggy the next morning. Reviewers frequently mention the calming, tasteless capsules are easy to swallow, and several pair them with coffee to soften jitters while staying focused during the day.

A smaller group of users didn’t notice a strong effect or found the calming benefit too mild for their needs. Some reported mild stomach upset, including nausea or heartburn, particularly when taken on an empty stomach.

Summary: With over 27,000 ratings, Non-GMO verification, and one of the lowest costs per serving in the category, Nature’s Trove earns its spot as the best overall L-theanine supplement.

2. Nutricost L-Theanine 200mg (120 Capsules) — Best Budget

Price: $11.95 (as of September 19, 2026)

Nutricost keeps things simple with a single-ingredient, 200 mg L-theanine capsule manufactured in an NSF-certified, FDA-registered facility at one of the lowest prices in this comparison.

Key Specs

• Active ingredient + form: L-Theanine, capsule
• Dose per serving: 200 mg
• Certifications: Non-GMO, Gluten-Free, NSF-certified/GMP-compliant, FDA-registered facility
• Third-party tested: Yes
• Servings per container: 120
• Price per serving: $0.10 (calculated manually, Price as of September 19, 2026)

Key Benefits

Supports calm focus and stress resilience without drowsiness, and helps take the edge off caffeine-related jitters when paired with morning coffee.

Key Ingredients

• L-Theanine (200 mg): a single, high-purity ingredient formulated to support calm focus and stress resilience through modulation of GABA and serotonin activity.

Pros

• One of the lowest costs per serving in the comparison at $0.10
• Manufactured in an NSF-certified, FDA-registered facility
• Simple, single-ingredient label with no proprietary blends

Cons

• Contains magnesium stearate and rice flour as fillers, which some reviewers flagged
• No enhanced-absorption technology like Suntheanine®

Best Suited For

Best suited for budget-conscious buyers who want a clean, single-ingredient L-theanine capsule from an NSF-certified facility.

Usage Recommendations

Take 1 capsule (200 mg) once or twice daily. For focus, use in the morning with caffeine; for relaxation, use in the evening.

Customer Feedback

Reviewers commonly describe falling asleep within about 20 minutes without feeling drowsy the next day, alongside steadier focus and reduced anxiety, especially when paired with morning coffee. Many highlight the affordable price, with several comparing it favorably to pricier brands for the same 200 mg dose.

A subset of reviewers were less impressed, saying the effect felt subtle or inconsistent compared with the marketing claims. Some also raised concerns about the capsule’s fillers, feeling the label could be more transparent about non-active ingredients.

Summary: Nutricost delivers a clean, NSF-facility-made 200 mg L-theanine capsule at one of the lowest prices per serving, making it the top budget pick.

3. Sports Research L-Theanine 200mg with Suntheanine® (120 Softgels) — Best for Daytime Focus

Price: $38.95 (as of September 19, 2026)

Sports Research uses patented Suntheanine® in an organic coconut oil softgel, giving daytime users a premium, clinically studied option for calm, jitter-free focus.

Key Specs

• Active ingredient + form: L-Theanine (Suntheanine®), softgel with organic coconut oil
• Dose per serving: 200 mg
• Certifications: Non-GMO, Gluten-Free, Soy-Free, cGMP-compliant facility
• Third-party tested: Yes
• Servings per container: 120
• Price per serving: $0.32 (calculated manually, Price as of September 19, 2026)

Key Benefits

Promotes calm, alert focus without sedation, smooths out caffeine jitters, and supports mental clarity during high-pressure work.

Key Ingredients

• L-Theanine, Suntheanine® form (200 mg): a patented, fermentation-derived L-theanine shown in clinical research to closely mirror the form naturally found in green tea, paired with organic coconut oil to support absorption.

Pros

• Uses patented Suntheanine®, the most clinically studied L-theanine form
• Organic coconut oil base may support absorption
• Over 15,000 ratings with strong long-term repeat purchases

Cons

• Highest price per serving in this roundup at $0.32
• Softgel isn’t vegan (contains gelatin)

Best Suited For

Best suited for professionals and students who want premium, clinically studied Suntheanine® for sustained daytime focus without jitters.

Usage Recommendations

Take 1 softgel (200 mg) daily on an empty stomach for faster onset. Pair with caffeine in the morning, or take alone in the evening for calm.

Customer Feedback

Reviewers frequently describe a fast-acting calming effect, often within 30 to 60 minutes, that eases anxiety and sharpens focus without drowsiness. Many appreciate the organic coconut oil base and clean formulation, and several long-term users say they’ve stuck with this brand specifically for its consistent quality.

The main complaint centers on price, with some reviewers noting it costs noticeably more per serving than competing brands. A smaller number reported mild stomach discomfort or felt the effect was too subtle to justify the cost.

Summary: With patented Suntheanine® and an organic coconut oil base, Sports Research stands out for daytime focus, even at a premium price.

4. NUTRAHARMONY L-Theanine 400mg (120 Capsules) — Best High-Dose

Price: $19.89 (as of September 19, 2026)

For users who need more than a standard dose, Nutraharmony delivers a 400 mg serving (two capsules) of vegan, GMP-certified L-theanine for stronger stress and sleep support.

Key Specs

• Active ingredient + form: L-Theanine, vegetable capsule
• Dose per serving: 400 mg (2 capsules)
• Certifications: Vegan, Non-GMO, GMP-certified, third-party lab tested
• Third-party tested: Yes
• Servings per container: 60 (120 capsules ÷ 2 per serving)
• Price per serving: $0.33 (calculated manually, Price as of September 19, 2026)

Key Benefits

Provides stronger relaxation and calming support than standard 200 mg products, eases anxiety-related thoughts at night, and supports mood balance.

Key Ingredients

• L-Theanine (400 mg per 2-capsule serving): a double-strength dose intended for users who need stronger calming support than a standard 200 mg serving provides.

⚠️ Dose disclaimer: This product’s 400 mg dose requires 2 capsules per serving (200 mg each) — not a single 400 mg capsule. Several Amazon reviewers found this labeling confusing.

Pros

• Highest single-serving dose in the lineup at 400 mg
• Vegan and GMP-certified with third-party lab testing
• Reviewers report a noticeably stronger effect than 200 mg products

Cons

• Requires 2 capsules per serving to reach the labeled 400 mg dose, which some reviewers found confusing
• Fewer total reviews than most other picks on this list

Best Suited For

Best suited for users with higher stress or sleep needs who want a stronger 400 mg dose in one serving.

Usage Recommendations

Take 2 capsules (400 mg total) daily, ideally 30–60 minutes before bed. Do not exceed the recommended dose.

Customer Feedback

Most reviewers say the supplement helps them relax and fall asleep more quickly, with several noting improved sleep quality and calmer moods when taken consistently as part of a nightly routine. Many describe it as an easy addition to their routine and appreciate the stronger effect compared with standard 200 mg products.

A recurring complaint is that the “400 mg” labeling refers to a two-capsule serving rather than a single capsule, which several reviewers felt was misleading. A few also reported no noticeable effect or mild side effects such as grogginess.

Summary: For users who need more than a standard 200 mg dose, Nutraharmony’s 400 mg serving delivers stronger calming support, provided the two-capsule serving size is used correctly.

5. Integrative Therapeutics L-Theanine (60 Capsules) — Best Clinically-Backed

Price: $22.00 (as of September 19, 2026)

Formulated by a practitioner-trusted brand with more than 25 years in clinical supplement development, this option is backed by controlled clinical trials on L-theanine’s stress-response effects.

Key Specs

• Active ingredient + form: L-Theanine, plant-derived capsule
• Dose per serving: 200 mg (2 capsules)
• Certifications: Vegan, Gluten-Free, Dairy-Free, Third-Party Tested (SuppCo)
• Third-party tested: Yes
• Servings per container: 30 (60 capsules ÷ 2 per serving)
• Price per serving: $0.73 (calculated manually, Price as of September 19, 2026)

Key Benefits

Supports a healthy stress response and relaxed state without diminishing daytime alertness, backed by controlled clinical research.

Key Ingredients

• L-Theanine (200 mg per 2-capsule serving): formulated by a practitioner-focused brand with a history of controlled clinical trials supporting L-theanine’s role in healthy stress response.

Pros

• Backed by controlled clinical trials on L-theanine’s stress-response benefits
• Practitioner-trusted brand with 25+ years in clinical supplement formulation
• Third-party tested and verified by SuppCo

Cons

• Highest price per serving on this list at $0.73
• 2-capsule serving size means the 60-count bottle lasts only 30 servings

Best Suited For

Best suited for those who prefer a practitioner-formulated brand with a longer clinical research history behind its ingredients.

Usage Recommendations

Take 2 capsules one to two times daily, or as directed by a healthcare professional.

Customer Feedback

Reviewers often describe this as a trusted, clinically minded brand, with many reporting calmer moods and easier sleep without the grogginess associated with other sleep aids. Several long-time users cite the third-party testing and the company’s decades in practitioner channels as reasons they continue to repurchase.

A handful of reviewers didn’t notice a clear difference or found the capsules large to swallow. A small number also reported headaches, and a few felt the price was high for a 60-capsule bottle.

Summary: Backed by clinical research and practitioner trust, Integrative Therapeutics is a strong pick for those who prioritize clinical credibility over price.

6. MaryRuth’s L-Theanine Liquid Drops (2oz) — Best Liquid

Price: $21.95 (as of September 19, 2026)

For anyone who dislikes swallowing capsules, MaryRuth’s lemon-lime liquid drops offer a fast-absorbing alternative backed by Clean Label Project purity testing.

Key Specs

• Active ingredient + form: L-Theanine, liquid drops
• Dose per serving: 200 mg per 2 mL
• Certifications: Non-GMO, Vegan, GMP facility, Clean Label Project Purity Award, B Corp Certified
• Third-party tested: Yes
• Servings per container: ~30
• Price per serving: $0.73 (calculated manually, Price as of September 19, 2026)

Key Benefits

Supports relaxation, mood, and better sleep in a fast-absorbing liquid format suitable for both adults and teens.

Key Ingredients

• L-Theanine (200 mg per 2 mL): delivered in a fast-absorbing liquid base for users who prefer not to swallow capsules, third-party verified for purity by the Clean Label Project.

Pros

• Fast-absorbing liquid format, useful for those who dislike capsules
• Clean Label Project Purity Award for verified low-toxin testing
• Pleasant lemon-lime flavor noted by most reviewers

Cons

• Dropper dosing is less precise than a fixed-dose capsule
• Highest cost per serving alongside Integrative Therapeutics at $0.73

Best Suited For

Best suited for people who dislike swallowing capsules, including teens, and want a flavored liquid alternative.

Usage Recommendations

Shake well and take up to 2 mL (200 mg) daily, either directly or mixed into water. Suitable for ages 4 and up under guidance.

Customer Feedback

Reviewers like the liquid format for its fast absorption and pleasant lemon-lime flavor, with many reporting easier sleep onset and reduced nighttime anxiety. Several parents mention giving it to children under guidance, and multiple reviewers highlight the third-party purity testing as a reason for trust.

A few reviewers found the dropper imprecise or difficult to measure accurately, leading to inconsistent dosing. Some also felt the liquid was pricier per serving than capsule alternatives.

Summary: MaryRuth’s liquid drops offer a fast-absorbing, flavored alternative to capsules, backed by Clean Label Project purity testing.

7. Double Wood L-Theanine 200mg (120 Capsules) — Best for Nootropic Stacks

Price: $19.95 (as of September 19, 2026)

With the highest average rating in this roundup, Double Wood’s filler-minimal L-theanine is designed to stack cleanly with other nootropics like magnesium L-threonate and apigenin.

Key Specs

• Active ingredient + form: L-Theanine, gelatin capsule
• Dose per serving: 200 mg
• Certifications: Non-GMO, Gluten-Free, GMP-certified, Third-Party Tested
• Third-party tested: Yes
• Servings per container: 120
• Price per serving: $0.17 (calculated manually, Price as of September 19, 2026)

Key Benefits

Supports a calm, focused mind without drowsiness, promotes alpha brain wave activity, and reduces caffeine-related jitters.

Key Ingredients

• L-Theanine (200 mg): a filler-minimal formula designed to stack cleanly with other nootropics like magnesium L-threonate and apigenin for layered cognitive support.

Pros

• Highest average rating in the roundup at 4.7 out of 5
• Formulated to stack cleanly with magnesium L-threonate and apigenin
• Competitive price at $0.17 per serving

Cons

• Single-ingredient formula with no added absorption enhancers
• Smaller review base than some top picks (1,696 ratings)

Best Suited For

Best suited for biohackers and nootropic stackers who plan to combine L-theanine with magnesium L-threonate or apigenin.

Usage Recommendations

Take 1 capsule (200 mg) with or without food. Many users pair it with magnesium L-threonate and apigenin in the evening.

Customer Feedback

Reviewers consistently praise this option for calming effects that don’t cause drowsiness, along with quicker entry into deep sleep and clearer daytime focus, especially when combined with caffeine. Many describe it as a trustworthy, go-to brand and mention stacking it with other nootropics for added benefit.

Feedback skews strongly positive, though a small number of reviewers said the effect felt mild compared with other brands they’d tried, and a few wished for a larger bottle size.

Summary: With the highest average rating in this roundup and a formula built for stacking, Double Wood is the go-to choice for nootropic users.

8. Micro Ingredients L-Theanine + Magnesium Glycinate (400 Softgels) — Best 2-in-1 Formula

Price: $24.95 (as of September 19, 2026)

This softgel pairs 200 mg of L-theanine with 200 mg of magnesium glycinate in a coconut and MCT oil base, offering layered relaxation and sleep support in a single dose.

Key Specs

• Active ingredient + form: L-Theanine + Magnesium Glycinate, softgel with coconut/MCT oil
• Dose per serving: 200 mg L-Theanine + 200 mg Magnesium Glycinate (2 softgels)
• Certifications: Non-GMO, cGMP-compliant facility, Third-Party Lab Tested, Gluten/Soy/Dairy-Free
• Third-party tested: Yes
• Servings per container: 200 (400 softgels ÷ 2 per serving)
• Price per serving: $0.12 (calculated manually, Price as of September 19, 2026)

Key Benefits

Supports deeper, more consistent sleep and a calmer overall mood by combining L-theanine with a well-absorbed form of magnesium.

Key Ingredients

• L-Theanine (200 mg) + Magnesium Glycinate (200 mg): pairs a calming amino acid with a highly bioavailable magnesium form, both linked to relaxation and sleep support through complementary pathways.

Pros

• Combines L-theanine with magnesium glycinate for layered sleep support
• Coconut and MCT oil base reported as gentle on digestion
• Strong value at $0.12 per serving for a 2-in-1 formula

Cons

• Softgel size is large, and a notable share of reviewers found it hard to swallow
• Fewer total reviews (874) than most other picks on this list

Best Suited For

Best suited for anyone who wants L-theanine and magnesium glycinate combined into a single nightly softgel.

Usage Recommendations

Take 2 softgels (200 mg L-theanine + 200 mg magnesium glycinate) daily, ideally in the evening to support sleep onset.

Customer Feedback

Reviewers appreciate the combined L-theanine and magnesium glycinate formula for supporting deeper, more consistent sleep and a calmer overall mood, often mentioning noticeably less grogginess than with L-theanine alone. Several also highlight the coconut and MCT oil base as gentle on digestion and the price as a strong value for a two-in-one formula.

The most common complaint is softgel size, with a notable number of reviewers describing the capsules as large and difficult to swallow. A smaller group reported stomach discomfort, such as heartburn.

Summary: Combining L-theanine with magnesium glycinate in one softgel, Micro Ingredients offers layered sleep support at a strong price per serving.

Evidence-Based Ingredients

L-Theanine

Traditionally consumed for centuries via green tea, L-theanine’s calming reputation is now backed by a growing body of clinical research showing it increases alpha brain wave activity linked to relaxed alertness. Multiple small randomized controlled trials support its use for reducing subjective stress and anxiety at doses of 200–400 mg, though most studies are short-term. It is not classified as a sedative and doesn’t appear to impair cognitive performance the way many calming compounds do.

Suntheanine®

This patented, fermentation-derived form of L-theanine was developed to replicate the naturally occurring amino acid found in green tea without extraction from actual tea leaves. Several of the clinical trials most frequently cited for L-theanine’s stress and focus benefits specifically used Suntheanine®, giving it a stronger evidence base than some generic L-theanine ingredients.

Magnesium Glycinate

Magnesium is well-established as essential for nervous system regulation, and the glycinate form is generally considered better absorbed and gentler on digestion than other magnesium salts. Emerging research suggests magnesium supplementation may support sleep quality, particularly in people with mild deficiency, though evidence specifically combining it with L-theanine remains limited.

The ingredients in our top picks have a mix of traditional use and emerging clinical evidence for relaxation and sleep support. They are not treatments for anxiety disorders, insomnia, or any other diagnosed condition and should not replace medical care.

What Are L-Theanine Supplements?

L-theanine supplements deliver a concentrated dose of the amino acid naturally found in green tea leaves, typically in capsule, softgel, powder, or liquid form. Unlike caffeine or many calming compounds, L-theanine promotes what researchers describe as “relaxed alertness” by influencing alpha brain wave activity rather than sedating the nervous system.

Supplement doses generally range from 100 mg to 400 mg per serving, well above what’s found in a typical cup of green tea.

Common Signs You May Need L-Theanine Support

• Frequent racing thoughts or difficulty winding down at night
• Jitteriness or anxiety after caffeine intake
• Trouble maintaining focus during stressful periods
• Sleep that feels light or interrupted despite adequate hours in bed
• Elevated stress without an obvious way to unwind
• Mental fatigue that worsens under pressure

Key Ingredients to Look For

• L-Theanine: the core active ingredient; look for a clearly labeled 100–400 mg dose per serving
• Suntheanine®: a patented, clinically studied form with a stronger research base than generic L-theanine
• Magnesium Glycinate: a well-absorbed mineral often paired with L-theanine for added sleep support
• Organic coconut/MCT oil: used in softgel formulas to support absorption

How to Choose

• Form and bioavailability: capsules and softgels suit daily routines; liquids and powders allow flexible dosing
• Dosage: 100–200 mg suits general relaxation; 400 mg suits stronger stress or sleep needs
• Third-party testing: look for NSF, GMP, or independent lab verification on the label
• Certifications: Non-GMO, vegan, and allergen-free labeling matters for sensitive users
• Price per serving: costs in this roundup range from $0.07 to $0.73 per serving

Who May Benefit

• Professionals and students managing daily stress or caffeine jitters
• Adults with occasional sleep disruption who want a non-sedating option
• Nootropic users stacking L-theanine with other cognitive-support ingredients
• Anyone seeking a non-hormonal alternative to melatonin for winding down

Safety and Side Effects

L-theanine is generally well-tolerated at studied doses.

Mild side effects can include headache, digestive discomfort, or drowsiness at higher doses. Because L-theanine may have a mild blood-pressure-lowering effect, individuals on blood pressure medication should consult a healthcare provider before use, as should pregnant or nursing women and anyone taking sedatives or stimulant medications.

What Results Can You Expect?

Most users report noticing a calming effect within 30 to 60 minutes of taking L-theanine, with effects on sleep quality or stress resilience becoming more consistent after several days to a few weeks of regular use.

Results vary by individual, dose, and whether L-theanine is combined with other ingredients like magnesium.

Lifestyle Tips

• Pair L-theanine with morning caffeine in a roughly 2:1 theanine-to-caffeine ratio to smooth out energy without jitters
• Take calming formulas 30–60 minutes before bed for sleep support
• Limit screen exposure and caffeine intake in the evening to complement supplementation
• Stay consistent daily, since cumulative effects on stress resilience build over time

FAQs About L-Theanine Supplements

Final Thoughts

For most people, Nature’s Trove L-Theanine is the strongest all-around choice, combining a large, budget-friendly supply with one of the highest review counts in the category.

If daytime focus and premium ingredient sourcing matter more than price, Sports Research L-Theanine with patented Suntheanine® is the better fit.

Anyone managing higher stress or more disrupted sleep may want to start with NUTRAHARMONY’s 400 mg formula instead of a standard 200 mg dose.

If you’re dealing with a diagnosed anxiety disorder, chronic insomnia, or you’re on blood pressure or sedative medication, talk to a doctor before starting any L-theanine supplement rather than self-treating with a product from this list.

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