Hi-Tech Pharmaceuticals L-Theanine delivers 200mg of pure L-Theanine per tablet — the naturally occurring amino acid found in green tea leaves, widely studied for its ability to promote a calm, focused mental state without drowsiness — using Hi-Tech's Cyclosome Technology (HPBCD + Phosphatidylcholine 75%) for enhanced absorption and bioavailability. L-Theanine promotes alpha brainwave activity, the same brainwave pattern associated with meditation and massage — producing relaxed alertness rather than sedation. It modulates GABA, dopamine, and serotonin pathways to support mood, calm, and cognitive performance simultaneously. Hi-Tech's formulation uses only the pure L-Theanine form — not a racemic D/L-Theanine mixture. 120 tablets — 120-day supply at 1 tablet daily. Take 1 tablet daily, preferably on an empty stomach. Zero stimulants. Zero caffeine. Appropriate for daily use, before demanding cognitive tasks, before bed for sleep support, or alongside caffeinated products for smoother energy. Not for use by individuals under 18. California Prop 65 Warning applies.†
Supplement Facts — Hi-Tech Pharmaceuticals L-Theanine (Per 1 Tablet / 120 Servings)
L-Theanine — 200mg (pure L-Theanine form only)
Other Ingredients: Microcrystalline Cellulose, Phosphatidylcholine 75%, Hydroxy Propyl Beta Cyclodextrin (HPBCD), Phytosterols, Magnesium Stearate, Silica
Delivery: Cyclosome Technology (HPBCD + Phosphatidylcholine 75%) — enhanced absorption via liposomal lymphatic pathway
Pure L-Theanine — not a D/L-Theanine racemic mixture
Zero stimulants. Zero caffeine.
120 tablets — 120-day supply at 1 tablet daily
Take 1 tablet daily, preferably on an empty stomach
Can be taken at any time of day — morning for focus, evening for relaxation and sleep support
Commonly stacked with caffeine for smoother energy and focus without jitters
Not for use by individuals under 18
Not for pregnant or nursing women without physician clearance
Consult a physician before use if taking any prescription medications
California Prop 65 Warning applies.
What L-Theanine Is — The Green Tea Amino Acid
L-Theanine (gamma-glutamylethylamide) is a non-protein amino acid found almost exclusively in the leaves of Camellia sinensis — the plant from which green tea, black tea, white tea, and oolong tea are produced. It is one of the primary compounds responsible for the unique mental state that green tea drinkers describe: calm alertness, focused relaxation, clear thinking without anxiety — the psychological profile that distinguishes tea's cognitive effects from the harder-edged energy of pure caffeine. While green tea contains both L-Theanine and caffeine, the L-Theanine moderates the anxious, jittery quality that caffeine alone produces — which is precisely why green tea produces a cleaner energy experience than equivalent doses of caffeine from coffee or energy drinks.†
Hi-Tech Pharmaceuticals specifically notes that their formulation contains only the pure L-Theanine form of this amino acid — an important distinction from cheaper products that use D/L-Theanine racemic mixtures. L-Theanine is the biologically active stereoisomer responsible for all of the amino acid's documented neurological effects. D-Theanine has no documented neurological activity and dilutes the potency of any stated dose that contains it. Pure L-Theanine ensures that the full 200mg stated per tablet is 200mg of the active form.†
The Alpha Brainwave Mechanism
L-Theanine's most distinctive documented mechanism is its ability to increase alpha brainwave activity — specifically 8-14Hz alpha waves measurable on EEG. Alpha waves are the signature of a relaxed but alert mental state: they are prominent during meditation, creative thinking, and the focused-yet-calm concentration of an expert performing familiar skilled work. Alpha waves are reduced during anxiety, rumination, and the overstimulated cognitive state that stress and high caffeine intake produce. Beta waves (higher frequency) characterize active engaged thinking but also anxiety and rumination when excessive. Theta waves characterize drowsiness and early sleep stages.†
What makes L-Theanine's alpha wave promotion clinically significant is the specific mental state it reflects: relaxed alertness without drowsiness. Human EEG studies using oral L-Theanine at 50-200mg have consistently documented significant increases in alpha wave amplitude within 30-45 minutes of ingestion — producing measurable reductions in subjective stress and anxiety scores alongside maintained alertness. This is the neurophysiological substrate of what users describe as "calm focus" — the specific mental quality that makes L-Theanine useful across such a diverse range of contexts: studying, creative work, stressful meetings, athletic mental preparation, and sleep onset support.†
The Four Primary Applications
Stress and Anxiety Reduction — The Most Documented Use
Multiple randomized controlled trials have documented L-Theanine's effects on psychological and physiological stress markers. A 2019 RCT published in Nutrients found that participants taking 200mg of L-Theanine daily for 4 weeks showed significant reductions in stress-related symptoms and improvements in sleep quality compared to placebo. Research has documented L-Theanine's stress-reducing effects through its ability to modulate GABA receptor activity (promoting the primary inhibitory neurotransmitter's calming effects) and reduce cortisol responses to stressors. At 200mg — the dose in Hi-Tech's tablet — L-Theanine is within the range used in virtually all positive published research on stress and anxiety reduction.†
Focus and Cognitive Performance — Particularly Paired With Caffeine
L-Theanine's cognitive performance benefits are particularly well-documented in combination with caffeine — the combination is one of the most extensively studied in nootropic research. Multiple studies using 100-200mg L-Theanine alongside 50-150mg caffeine have documented improvements in sustained attention, reaction time, working memory, and the subjective quality of alertness compared to caffeine alone — with reduced jitteriness, reduced blood pressure elevation, and smoother, more sustainable energy. The L-Theanine:Caffeine ratio most commonly studied is 2:1 (200mg Theanine : 100mg Caffeine), though benefits have been documented across a range of ratios. For Get Yok'd customers who use caffeinated pre-workouts, energy drinks, or coffee, adding Hi-Tech L-Theanine addresses the jitter and anxiety dimension that high caffeine doses commonly produce.†
Sleep Quality Support — Without Sedation
L-Theanine is not a sedative — it does not produce drowsiness through the same mechanisms as melatonin, GABA supplements, or pharmaceutical sleep aids. Its sleep support mechanism is indirect: by reducing the anxiety, cognitive rumination, and physiological arousal that prevent sleep onset in stressed individuals, L-Theanine helps create the mental conditions in which natural sleep onset can occur. Research has documented improved sleep quality, reduced sleep latency, and reduced nocturnal awakening from L-Theanine supplementation — effects attributed to the GABA-ergic calming and alpha wave-promoting activity rather than direct sedation. This makes L-Theanine specifically useful for individuals whose sleep difficulties are caused by an inability to "turn off" mental activity rather than by circadian or physiological sleep disorders.†
Immune and Antioxidant Support
L-Theanine has documented immune-modulating properties beyond its neurological effects. Research has shown that L-Theanine supports the activity of gamma-delta T-cells — a subset of T-cells that are among the first responders to pathogen infections — and has antioxidant properties that contribute to the overall health benefits associated with green tea consumption. The immune benefits of L-Theanine are less commonly the primary motivation for supplementation in the sports nutrition context, but they represent a meaningful secondary benefit for athletes whose immune function can be compromised during high-volume training phases.†
Why Cyclosome Technology for L-Theanine
L-Theanine is generally considered to have reasonable oral bioavailability on its own — it is a small, water-soluble amino acid that absorbs through amino acid transporters in the intestinal epithelium. Hi-Tech's rationale for applying Cyclosome Technology to L-Theanine is the same rationale they apply to other compounds: optimizing the absorption rate and consistency across different physiological states (fed vs. fasted, variable gut motility, individual differences in transporter expression) to ensure more reliable and complete delivery of the stated dose. The Cyclosome Technology's lipid-phase inclusion of L-Theanine through the HPBCD cyclodextrin complex and Phosphatidylcholine 75% liposomal membrane may provide additional absorption through the lymphatic pathway alongside the standard amino acid transporter pathway — producing more complete absorption independent of standard amino acid transporter competition or saturation.†
L-Theanine Alone vs. L-Theanine with Caffeine — The Two Primary Use Cases
The two primary protocols for L-Theanine in the sports nutrition and cognitive performance contexts are distinct and serve different goals. Standalone L-Theanine (without caffeine) is used specifically for calming, stress reduction, sleep support, and focus in contexts where caffeine is not appropriate — late-day use, anxiety management, relaxation before sleep, or situations where caffeine sensitivity limits use. The L-Theanine + Caffeine combination is used for enhanced cognitive performance during demanding tasks — the L-Theanine moderates caffeine's negative effects (jitters, anxiety, blood pressure elevation) while preserving and enhancing its positive effects (alertness, attention, processing speed). Both protocols work at the 200mg dose in Hi-Tech's tablet. Hi-Tech L-Theanine can be taken as a standalone daily supplement or added alongside any caffeinated pre-workout, energy drink, or morning coffee for the combination effect.†
Frequently Asked Questions
Will L-Theanine make me drowsy?
No — L-Theanine promotes relaxed alertness, not sedation. It increases alpha brainwave activity (the relaxed-but-alert state) rather than theta or delta waves (drowsiness and sleep). Most users describe the effect as feeling calmer and more focused rather than sleepy. When taken before bed, L-Theanine helps quiet mental activity that prevents sleep onset without causing daytime drowsiness in most individuals. Individual responses vary — some sensitive individuals may find higher doses produce mild sleepiness.†Can Hi-Tech L-Theanine be taken with pre-workouts or energy drinks?
Yes — this is one of the most common use cases. L-Theanine specifically moderates the jitteriness and anxiety that high-dose caffeine pre-workouts and energy drinks can produce, while preserving caffeine's performance benefits. Adding 200mg L-Theanine to any caffeinated pre-workout produces a smoother, more focused energy experience than caffeine alone. This is why L-Theanine is already included in many premium pre-workouts at this dose — Hi-Tech's standalone tablet lets you add this benefit to any existing formula.†How quickly does L-Theanine work?
L-Theanine begins producing measurable alpha wave changes within 30-45 minutes of oral ingestion in published EEG research. Subjective effects (reduced tension, improved focus, calmer mental state) are typically noticed within 30-60 minutes. For sleep support, taking L-Theanine 30-60 minutes before intended sleep onset allows the relaxation effect to develop before the target sleep time. Some users report noticing effects within 20 minutes; consistent daily use may produce more pronounced benefits over several weeks.†Is Hi-Tech L-Theanine appropriate for tested athletes?
Yes — L-Theanine is not prohibited by WADA, NCAA, or any major sports governing body. It is a naturally occurring amino acid found in green tea. Hi-Tech's tablet uses no stimulants, hormones, or prohibited compounds of any kind. Tested athletes can use this product without any regulatory concern.†
How to Take Hi-Tech Pharmaceuticals L-Theanine
Take 1 tablet daily, preferably on an empty stomach. For focus and cognitive performance support: take 30-45 minutes before demanding work, studying, or athletic mental preparation — with or without caffeine. For stress reduction and calm throughout the day: take with morning or midday routine. For sleep support: take 30-60 minutes before intended sleep onset. For smoother caffeine experience: take alongside any caffeinated pre-workout, energy drink, or coffee. Dose can be adjusted — some users take 1-2 tablets for more pronounced effects; consult physician before exceeding label recommendations. Not for individuals under 18. Not for pregnant or nursing women without physician clearance. Consult a physician before use if taking prescription medications — particularly antidepressants, sleep medications, or CNS-active drugs, as L-Theanine modulates serotonin and GABA pathways. California Prop 65 Warning applies.†
Why Buy at Get Yok'd
Real-time inventory across all five Southern California stores
Available in Burbank, Glendale, Glendale Galleria, Pasadena, and North Hollywood
Authorized Hi-Tech Pharmaceuticals retailer — carrying the full Hi-Tech nutraceutical and wellness lineup
Staff who can help you incorporate L-Theanine into a complete focus, stress management, and sleep support protocol
One of the best loyalty programs in the supplement industry — earn rewards on every purchase
Who Should Exercise Caution with L-Theanine
Not for individuals under 18 years of age
Not for pregnant or nursing women without physician clearance
Individuals taking antidepressants (SSRIs, SNRIs, MAOIs) should consult a physician — L-Theanine modulates serotonin and dopamine pathways that may interact with these medications
Individuals taking prescription sleep medications or sedatives should consult a physician — additive calming effects may be produced
Individuals taking blood pressure medications should consult a physician — L-Theanine has documented mild blood pressure-lowering effects that may compound antihypertensive medications
Individuals with known hypersensitivity to tea (Camellia sinensis) should use caution
Do not use if you have any medical condition without first consulting a physician
California Prop 65 Warning applies.
Keep out of reach of children.
†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.