L-Theanine 1000 mg, 60 Vegan Capsules
- Supports Calm Focus & Mental Clarity*
- Promotes Restful Sleep Without Drowsiness*
- Vegan Capsules — No Fillers, Lab-Tested*
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*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
L-theanine is the calming amino acid in green tea, and it works at 200 to 400 mg by raising alpha brain wave activity within 30 to 45 minutes of oral intake. Remedy's Nutrition L-Theanine delivers 1000 mg per vegan capsule with no fillers, lab-tested for purity in a cGMP facility in the USA.
This page covers what L-theanine actually does in the brain, the 8 evidence-backed benefits, how to dose for stress, sleep, and focus, the caffeine stack ratio that works, drug interactions across 10 classes, and who should not take it.
Quick Answer: L-Theanine 1000mg
L-theanine promotes calm focus at 200 to 400 mg without drowsiness, with peak effect in 30 to 45 minutes. The 1000 mg capsule allows flexible dosing (split for 250 to 500 mg) or full dose for higher-need users. Pair with caffeine in a 2:1 ratio for focus, or take 30 to 60 minutes before bed for sleep.
Key Takeaways
- L-theanine works at 200 to 400 mg in 30 to 45 minutes.
- Calm focus comes from alpha brain wave activation, not sedation.
- Caffeine stack ratio is 2:1 L-theanine to caffeine.
- Safe for 4 to 8 weeks of daily use at 200 to 400 mg.
- Drug interactions span 5 classes including BP and SSRIs.
- Avoid in pregnancy and BP under 90/60 mmHg.
- Remedy's offers 1000 mg vegan capsules with no fillers.
What Is L-Theanine?
L-theanine is a non-protein amino acid found almost exclusively in the leaves of Camellia sinensis (the tea plant) and in trace amounts in the Boletus badius mushroom. Discovered in Japanese green tea in 1949, it accounts for roughly 1 to 2% of the dry weight of tea leaves and is responsible for the calming counterpoint to tea's caffeine. The amino acid crosses the blood-brain barrier within 30 to 45 minutes of oral intake.[1]L-Theanine Absorption and Pharmacokinetics — PubMed View source
Unlike most amino acids, L-theanine does not build muscle or repair tissue. Its sole pharmacological role is in the central nervous system, where it modulates GABA, dopamine, and serotonin pathways while raising alpha brain wave activity. This is why a cup of green tea calms you down even though it contains caffeine. For a full breakdown of the science, see our complete L-theanine guide.
Why Remedy's Nutrition L-Theanine
Remedy's Nutrition L-Theanine 1000 mg sets the bar on three measurable specs: dose per capsule, purity, and capsule format. Most retail L-theanine products deliver 100 to 200 mg per capsule with fillers; ours delivers a full 1000 mg per vegan capsule, allowing flexible partial dosing for stress (200 to 400 mg) or full dose for higher-need users.
| What You Get | Why It Matters |
|---|---|
| 1000 mg L-theanine per vegan capsule | 5x to 10x the dose of typical retail L-theanine. Split for 250 to 500 mg or take whole for higher-need users. |
| Zero fillers, binders, or dyes | No magnesium stearate, no titanium dioxide, no artificial colors. Just pure L-theanine and a vegan HPMC capsule. |
| Made in USA, cGMP-certified facility | FDA-registered facility with batch-level quality control and lab verification of every production run. |
| Lab-tested for purity | Third-party testing confirms L-theanine content matches label claim and product is free of heavy metals. |
| 60 vegan capsules per bottle | 60 to 240 day supply depending on dose. Suitable for vegan, vegetarian, gluten-free, and non-GMO diets. |
| Non-habit forming | No documented tolerance or dependence across published trials up to 8 weeks of daily use. |
The Top 8 Evidence-Backed Benefits of L-Theanine
L-theanine has been studied in 40+ human clinical trials. The strongest evidence concentrates on stress reduction, sleep quality, attention, and the caffeine stack — areas with multiple randomized controlled trials showing statistically significant results versus placebo.[2]L-Theanine for Stress: Randomized Controlled Trial — PubMed View source
| Benefit | Key Clinical Finding | Effective Dose |
|---|---|---|
| Acute stress reduction | Lowered salivary alpha-amylase and self-reported stress in 5+ RCTs (Kimura 2007 and replications) | 200 mg, 30 to 45 min pre-stressor |
| Sleep quality | Improved subjective sleep quality and reduced sleep latency in 4 RCTs without sedation | 200 to 400 mg, 30 to 60 min pre-bed |
| Calm focus with caffeine | Improved attention switching, reaction time, and reduced jitter in 6+ caffeine combo trials | 200 mg L-theanine + 100 mg caffeine |
| Anxiety adjunct | Reduced anxiety in GAD trial as adjunct to antidepressant (Sarris 2019) | 200 mg twice daily |
| ADHD attention support | Improved sleep efficiency and attention in pediatric ADHD trial (Lyon 2011, boys 8 to 12) | 400 mg/day for 6 weeks |
| Alpha brain wave activation | Measurable EEG alpha increase within 30 to 45 min, sustained 1 to 3 hours | 200 mg single dose |
| Blood pressure modulation | Lowered systolic BP 5 to 8 mmHg in stressed adults across multiple trials | 200 mg pre-stressor |
| Mental clarity in MCI | Improved memory and attention in older adults with mild cognitive impairment (Park 2011) | 1670 mg green tea extract |
For the full evidence breakdown including effect sizes per benefit, read our deep dive on L-theanine for anxiety.
How L-Theanine Works in the Brain
L-theanine produces calm focus through 4 documented mechanisms that act simultaneously: alpha brain wave activation, GABA receptor modulation, glutamate competition, and dopamine plus serotonin balancing. The combined effect is a relaxed but alert mental state, distinct from sedation or stimulation.[3]L-Theanine NMDA Glutamate Receptor Mechanism — PubMed View source
| Mechanism | What It Does | Functional Effect |
|---|---|---|
| Alpha brain wave boost | Increases 8 to 13 Hz alpha-frequency EEG activity in occipital and parietal cortex within 30 to 45 min | Relaxed-alert state similar to meditation; reduced mental chatter |
| GABA receptor modulation | Partial agonist at GABA-A receptors, raising central GABA tone without full sedation | Calm without drowsiness; better sleep onset |
| NMDA glutamate competition | Structural analog of glutamate; competes at NMDA receptors, dampening excitatory signaling | Reduced stress reactivity; lower cortisol spike under load |
| Dopamine and serotonin balance | Modulates striatal dopamine and raises brain serotonin in animal studies | Mood support; complementary to caffeine's dopamine release |
How Much L-Theanine Should You Take?
L-theanine dosage ranges from 100 mg to 900 mg per day in published trials, with most healthy adults responding to 200 to 400 mg. Start at the low end of the range for your use case and adjust upward over 1 to 2 weeks. The 1000 mg Remedy's capsule allows precise partial dosing by splitting the contents.
| Use Case | Effective Dose | Timing | Duration |
|---|---|---|---|
| Acute stress (pre-event) | 200 mg | 30 to 45 min before stressor | Single dose as needed |
| Daily stress management | 200 mg, 1 to 2x/day | Morning and/or midday | 4 to 8 weeks then reassess |
| Sleep support | 200 to 400 mg | 30 to 60 min pre-bed | Nightly as needed |
| Caffeine stack (focus) | 200 mg + 100 mg caffeine | With morning coffee | Daily as needed |
| Anxiety adjunct (with Rx) | 200 mg, 2x/day | With breakfast and lunch | Doctor-supervised, 8 weeks |
| ADHD attention support | 400 mg/day | Morning, with doctor guidance | 6 weeks then reassess |
| Higher need / non-responders | 400 to 600 mg | Split across day | Reassess after 4 weeks |
For a step-by-step dosing protocol including how to find your minimum effective dose, see our L-theanine dosage guide.
When to Take L-Theanine
Timing of L-theanine matters more than total daily dose because the 60 to 75 minute half-life means effects fade within 2 to 3 hours of a single dose. Match the dose timing to when you need the calm-focus window, not on a fixed schedule.
| Time of Day | Purpose | Dose | Pair With |
|---|---|---|---|
| Morning (6 to 9 AM) | Calm-focus workday start | 200 mg | Coffee or tea (100 to 150 mg caffeine) |
| Mid-morning (10 to 11 AM) | Deep focus block | 100 to 200 mg | Optional second coffee |
| Pre-stressor (event-based) | Presentation, meeting, exam | 200 mg, 30 to 45 min prior | Water only |
| Mid-afternoon (2 to 4 PM) | Avoid energy slump without caffeine | 100 to 200 mg | Solo |
| Evening (6 to 8 PM) | Wind-down transition | 200 mg | Herbal tea (no caffeine) |
| Pre-bed (30 to 60 min before) | Sleep onset support | 200 to 400 mg | Magnesium glycinate optional |
L-Theanine and Caffeine: The Perfect Stack
The L-theanine plus caffeine stack at a 2:1 ratio (200 mg L-theanine + 100 mg caffeine) is the most-tested combination in published cognitive trials. The pairing improves attention switching, reaction time, and reduces caffeine jitter compared to caffeine alone across 6+ RCTs.[4]L-Theanine Plus Caffeine Attention Switching — PubMed View source
The mechanism is complementary: caffeine blocks adenosine receptors (alertness), while L-theanine raises alpha brain waves (calm focus). The result is the focused alertness that experienced tea drinkers have valued for centuries, replicated in modern coffee plus L-theanine routines. For the complete stacking protocol including ratios and what to avoid, see our L-theanine and caffeine guide.
L-Theanine for Sleep
L-theanine for sleep works at 200 to 400 mg taken 30 to 60 minutes before bed, with effects on subjective sleep quality documented across 4 randomized trials. Unlike melatonin (which shifts circadian timing) or GABA agonists (which cause sedation), L-theanine works by reducing pre-sleep mental chatter and calming the stress response that keeps you awake.[5]L-Theanine Sleep Quality Pediatric RCT — PubMed View source
This is why L-theanine is non-sedating: you do not feel drugged or groggy, and it does not lengthen sleep duration on its own. It improves sleep quality, not sleep amount. For dosing, timing, and what to stack it with, read our L-theanine for sleep guide.
L-Theanine vs Ashwagandha, GABA, and Melatonin
L-theanine, ashwagandha, GABA, and melatonin are 4 popular calming supplements with fundamentally different mechanisms and use cases. Picking the right one depends on your goal: acute calm-focus, chronic stress, sleep onset, or circadian reset.
| Supplement | Best For | Onset | Mechanism |
|---|---|---|---|
| L-Theanine | Acute calm focus, pre-stressor, sleep quality | 30 to 45 min | Alpha brain waves, GABA modulation |
| Ashwagandha | Chronic stress, cortisol reduction, daily resilience | 2 to 4 weeks | HPA axis modulation, adaptogen |
| GABA | Direct GABA receptor stimulation (BBB crossing controversial) | 30 to 60 min if effective | GABA-A agonism (peripheral) |
| Melatonin | Jet lag, shift work, circadian reset | 30 to 60 min | MT1 and MT2 receptor agonism |
For the full 4-way decision tree and which to stack with what, see our L-theanine vs ashwagandha, GABA, and melatonin comparison.
Side Effects and Drug Interactions
L-theanine side effects are uncommon and mild in trials, with headache, mild nausea, and lowered blood pressure being the 3 most reported. The 28-day safety study at 200 mg/day in 30 healthy adults showed zero serious adverse events.[6]L-Theanine 28-Day Safety Trial — PubMed View source Drug interactions span 10 medication classes worth discussing with a prescriber.
| Drug Class | Interaction Mechanism | What to Do |
|---|---|---|
| Blood pressure medications | Additive BP-lowering (L-theanine drops systolic 5 to 8 mmHg) | Monitor BP; lower dose if symptomatic hypotension |
| Stimulants (Adderall, Vyvanse) | May blunt prescribed stimulant focus boost | Discuss with prescriber before stacking |
| Sedatives, benzodiazepines | Additive central calming via GABA modulation | Avoid combining without doctor guidance |
| Antidepressants (SSRIs) | Theoretical serotonin modulation | Discuss before adding; monitor mood |
| Chemotherapy agents | Animal data shows altered drug levels for some agents | Do not use during chemo without oncologist clearance |
| Alcohol | Additive sedation in higher doses; potentiates calming | Avoid combining; especially driving |
| Levodopa (Parkinson's) | Theoretical dopamine modulation | Discuss with neurologist |
| Anticoagulants | No clear interaction documented | Generally safe; monitor INR if concerned |
| Anticonvulsants | Theoretical glutamate modulation | Discuss with neurologist before use |
| MAOIs | Theoretical serotonin and dopamine interaction | Avoid without psychiatric supervision |
For the full safety review including red-flag symptoms that warrant stopping, see our L-theanine side effects and drug interactions guide.
Who Should Not Take L-Theanine
L-theanine is well-tolerated by healthy adults, but 5 groups should avoid it or use only with medical supervision. The most important contraindication is pregnancy, where safety data does not exist.
| Group | Reason | Action |
|---|---|---|
| Pregnancy and breastfeeding | No human safety data; FDA GRAS excludes pregnant and lactating women | Avoid; discuss with OB before use |
| Children under 8 | Pediatric safety data limited to one ADHD trial in boys 8 to 12 (Lyon 2011) | Only with pediatrician supervision for specific indications |
| Low blood pressure (under 90/60) | L-theanine drops systolic BP 5 to 8 mmHg, may worsen hypotension | Avoid or use very low dose with monitoring |
| Schizophrenia (without psychiatric care) | Used as adjunct in trials only under psychiatric supervision | Do not self-supplement; requires prescriber |
| People on multiple CNS medications | Additive sedation, BP, or mood effects possible | Discuss full medication list with doctor |
For an ADHD-specific safety guide including the prescriber-required combination protocol, see our L-theanine for ADHD and focus guide.
What's in the Bottle
Remedy's Nutrition L-Theanine comes in a 60-capsule bottle with a single, simple formula: 1000 mg of pure L-theanine per vegan capsule. No fillers, no binders, no artificial colors, no titanium dioxide, no magnesium stearate. The capsule itself is plant-based HPMC (hydroxypropyl methylcellulose), suitable for vegan, vegetarian, and gluten-free diets.
| Spec | Detail |
|---|---|
| L-theanine per capsule | 1000 mg |
| Capsules per bottle | 60 |
| Supply duration | 60 days at 1000 mg/day; up to 240 days at 250 mg/day |
| Capsule type | Vegan HPMC (plant-based) |
| Other ingredients | None — zero fillers, binders, or dyes |
| Manufacturing | Made in USA, FDA-registered cGMP facility |
| Testing | Third-party lab tested for purity and potency |
| Allergens | Free of gluten, soy, dairy, eggs, nuts, shellfish |
| Diet compatibility | Vegan, vegetarian, gluten-free, non-GMO |
Frequently Asked Questions
What is L-theanine used for? +
L-theanine is used for calm focus, stress reduction, sleep quality, and stacking with caffeine. The most-tested adult doses are 200 to 400 mg taken 30 to 45 minutes before the desired effect. Clinical trials show measurable benefits in 5+ RCTs for acute stress and 4 RCTs for sleep quality.
How much L-theanine should I take per day? +
Healthy adults start at 100 to 200 mg per day and adjust up to 400 mg as needed. The maximum studied daily dose is 900 mg, with a practical safety ceiling of 600 mg. A 28-day safety trial at 200 mg/day showed zero adverse events in 30 healthy adults.
How fast does L-theanine work? +
L-theanine reaches peak blood levels in 30 to 50 minutes after oral intake, with alpha brain wave changes measurable within 30 to 45 minutes. The half-life is 60 to 75 minutes, so the calm-focus window is 1 to 3 hours per dose. No buildup is needed; first-dose effects are reliable.
Is L-theanine safe to take every day? +
Yes, daily L-theanine at 200 to 400 mg is safe for healthy adults based on 4-week and 8-week clinical trials. The FDA has granted GRAS status to L-theanine at intakes up to 250 mg/serving. No tolerance, dependence, or withdrawal has been documented in published trials lasting up to 8 weeks.
Does L-theanine make you sleepy? +
No, L-theanine is non-sedating at typical 200 to 400 mg doses. It promotes calm alertness via alpha brain waves rather than the drowsiness caused by GABA agonists or antihistamines. This is why it works as a daytime focus tool and also for sleep, where it lowers pre-sleep mental chatter without causing morning grogginess.
Can I take L-theanine with coffee? +
Yes, the L-theanine plus caffeine stack at a 2:1 ratio (200 mg L-theanine + 100 mg caffeine) is the most-tested combination in cognitive trials. The pairing improves attention switching, reaction time, and reduces caffeine jitter compared to caffeine alone across 6+ RCTs.
What are the side effects of L-theanine? +
L-theanine side effects are uncommon and mild. The 3 most reported in trials are headache, mild nausea, and lowered blood pressure (5 to 8 mmHg systolic). No serious adverse events occurred in a 28-day safety study at 200 mg/day. Discontinue if blood pressure drops below 90/60 mmHg.
Does L-theanine interact with medications? +
Yes, L-theanine can interact with 5 medication classes: blood pressure medications (additive BP-lowering), stimulants like Adderall (may blunt focus boost), sedatives (additive calm), chemotherapy (animal data only), and SSRIs (theoretical serotonin modulation). Consult a prescriber before stacking with any prescription.
Is 1000 mg of L-theanine too much? +
A 1000 mg L-theanine capsule is convenient for partial dosing (split for 250 to 500 mg) or for users who tolerate higher doses. Doses up to 900 mg/day have been used safely in published trials. Most healthy adults find 200 to 400 mg sufficient; start at 250 mg (1/4 capsule) and adjust.
When should I take L-theanine for sleep? +
Take 200 to 400 mg of L-theanine 30 to 60 minutes before bed for sleep support. The 60 to 75 minute half-life means it covers the sleep-onset window without lingering into morning. Pair with sleep hygiene (cool room, no screens 60 min before bed) for best result across 4 RCTs.
Can children take L-theanine? +
Pediatric use should be supervised by a doctor. The single pediatric RCT (Lyon 2011) dosed 400 mg/day in boys aged 8 to 12 with ADHD for 6 weeks with no safety signals. The 2017 pediatric safety review concluded L-theanine has acceptable tolerability when prescribed for specific indications. Do not give to children under 8 without medical guidance.
Is L-theanine safe during pregnancy? +
No, L-theanine is not recommended during pregnancy or breastfeeding due to lack of human safety data across all 3 trimesters. The FDA GRAS status (250 mg/serving) applies to non-pregnant adults only. Most OBs advise avoiding L-theanine in pregnancy outside specific medical guidance. Discuss any supplement with your provider before use during pregnancy.
What makes Remedy's L-theanine different? +
Remedy's Nutrition L-Theanine delivers 1000 mg per vegan capsule with zero fillers, binders, or artificial colors. The product is made in the USA in a cGMP-certified facility and lab-tested for purity. Each bottle contains 60 capsules (60 to 240 day supply depending on dose). Suitable for vegan, vegetarian, and gluten-free diets.
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. Consult your healthcare provider before starting any new supplement, especially if pregnant, breastfeeding, taking medications, or managing a health condition.