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A woman preparing to meditate takes a Neuro Calm & Clarity mint

Enhance Your Meditation: L-theanine for Alpha Waves

by Bruna Cecilio in Think Tank: The Neuro Blog

Tea and meditation have been in the same room for a very long time. Monasteries in China and later Japan kept tea close to the cushion because there was a practical reason for it.

During meditation practice, it can be difficult to stay awake during long sittings. Around the 3rd to 4th centuries, monks found that tea helped them stay awake without making them jittery. 

We can now put an EEG cap on the question. When researchers take a closer look at EEG scans, a lot of the attention lands on one compound from tea leaves called L-theanine, and on one brain wave frequency called alpha waves.

Here is what that research actually shows and how some practitioners incorporate it into a sitting practice like meditation.

Overview:

  • Tea and meditation go way back: Monks around the 3rd–4th centuries kept tea near the cushion because it helped them stay awake through long sittings without the jitters.
  • Alpha waves are the star: Sitting in the 8–13 Hz range, they signal "relaxed wakefulness" — calm but awake, and linked to internal focus and concentration. They rise during meditation, and the effect shows up fast.
  • L-theanine moves the same band: The calming compound from tea leaves has been shown in EEG studies to shift alpha activity, especially the focused, task-driven kind that mirrors what meditation does — attention held at a lower cost.
  • The practice comes first: L-theanine is an optional on-ramp while you build the habit — it can't replace consistent practice, sleep, or stress management.
  • How to use it around a sit: Calm & Clarity Mints (L-theanine + GABA + D3) for relaxation practice, caffeine-free Memory & Focus Gum for concentration work, or Energy & Focus Gum if you want a caffeine pairing.

 

What Alpha Waves Actually Are

EEG picks up electrical activity at the scalp and sorts it by frequency. The usual map looks like this:

  • Delta waves (roughly 0.5 to 4 Hz): deep sleep
  • Theta waves (4 to 8 Hz): drowsy states and deep meditation
  • Alpha waves (8 to 13 Hz): relaxed wakefulness, strongest with the eyes closed
  • Beta waves (13 to 30 Hz): active, effortful thinking
  • Gamma waves (30 Hz and up): high level integration

Alpha brain waves occupy the calm but awake band, the state usually described as relaxed alertness. However, alpha is a frequency range linked not only to relaxation, but also to creativity, internal focus, mental productivity, and proper concentration. It becomes more pronounced when we shift our focus from external stimuli to internal experience. Alpha waves rise when your eyes are closed and your attention isn't locked onto a specific external task, and it drops when you start actively problem-solving.

EEG Basics: What Your Brain Waves Actually Look Like

Alpha waves are thought to protect the brain from paying too much attention to unnecessary thoughts and stimuli. During meditation, the brain's alpha waves are more abundant than during simple relaxation, because sitting moves these waves, and the effect shows up fast.

In one study of novices given a brief intervention, researchers recorded a roughly 16 percent global increase in alpha power and 29 percent in theta against pre-meditation baselines. Nondirective meditation shows similar shifts, and so do broader spectral analyses of mindfulness practice.

 

The L-Theanine and Alpha Wave Research

L-theanine comes from Camellia sinensis, the tea plant. It is most abundant in green tea, but it is also present in black tea. However, its amount can vary depending on the processing method. Therefore, the amount of L-theanine in a cup of tea depends on the type of tea and how it is produced.

It is usually the compound people credit for why tea feels different from coffee. It makes you feel awake without the jitters. It may also be the only widely used nootropic that most people consume in a mug rather than a capsule.

Several teams have put L-theanine to the test with an  EEG cap:

The First Study’s Importance

According to the first study, the type of alpha wave matters.  Typically, sedation increases alpha wave activity. In the study, however, participants’ alpha wave activity was shown to shift while they were focusing on a task.  This resembles something that we see in meditation: focus being maintained at a lower cost. 

In typical studies, doses of L-theanine cluster between 100 and 250 mg, usually administered as a single dose rather than over multiple weeks. EEG recordings are typically taken 30 to 90 minutes after administration, with effects showing up most consistently over the frontal and parietal cortex. Study designs tend to be placebo-controlled and often crossover, though sample sizes are usually small — which brings us to the caveat: a 2024 review found that human evidence for L-theanine's claimed effects remains limited in rigor, with results that don't always replicate across studies.

It is also important to remember that AlphaWave is a specific branded form. While generic L-theanine typically follows the AlphaWave findings, the numbers can shift depending on dose and exact formulation.

A woman doing yoga has a packet of Neurop Calm & Clarity mints on her mat

Why Meditators Care About Alpha Waves

What makes alpha power interesting to practitioners is that it keeps mapping onto states they already have words for: eyes closed, relaxed awareness; holding attention without gripping it; less internal narration, which overlaps with default mode network research on self-referential thought. Of course, experienced practitioners may show different profiles than beginners. A Zen practitioner, someone who has completed twenty Vipassana retreats, or a biohacking reader who has studied Huberman's earlier work, will likely draw different conclusions from the same findings than a beginner would.

There's one report that comes up again and again, across traditions and experience levels: people who meditate consistently say they start "dropping in" faster. Whatever that shift is, consistent practice produces it, and it takes time — which is where the interest in supplements comes in.

If a compound moves the same brainwave band that consistent practice moves, perhaps it can serve as an on-ramp while a beginner is still building the habit. However, the evidence for this is suggestive rather than definitive. Consistent practice is the only proven method of building up this mental muscle.

 

How to use L-Theanine Around a Meditation Practice

The practice itself is the path. Supplements are not required for meditation; they are only optional supports.

Before a morning sit: One Neuro Calm & Clarity Mint roughly 20 to 30 minutes before you meditate.Calm & Clarity Mints pair L-theanine with GABA and Vitamin D3, which supports alpha brain wave activity for times when you want to quiet the mind.* 

Before a concentration practice (Shamatha, breath counting, any single-object technique):  Our caffeine-free Memory & Focus Gum is the better fit. One piece contains L-theanine, Cereboost® Ginseng, and Vitamins B6 and B12.

If you are a caffeine person, some practitioners pair L-theanine with caffeine on purpose, because the two  have a synergistic effect together. Neuro Energy & Focus Gum delivers 40 mg of natural caffeine with L-theanine for a smooth, steady boost.

Tea or Supplement?

As mentioned before, green tea is the main natural source of L-theanine. The amount depends on the cultivar, the leaf grade, your water temperature, and how long you steep your tea for. Matcha runs higher because you are consuming the whole leaf rather than a diluted version of it. 

Typical L-theanine EEG Study Parameters

Source

L-theanine

Typical cup of green tea

20 to 60 mg

Neuro gum and mints, per piece

60 mg

Doses used in most EEG studies

100 to 250 mg

Neuro products deliver 60mg of L-theanine per piece. While that sits slightly below the studied doses, when combined with dietary intake for meditators who already drink tea,  the combination can quickly approach the studied 100-250mg dose.


The Research Limitations

EEG alpha wave changes caused by L-theanine are real, but individual responses vary. It’s also important to note that "increased alpha power" is not the same as "reaching enlightenment." Neural correlations should not be confused with mental states. While supplements can be a support, the benefits of meditation come from the practice itself.

Secondly, it is important to note that L-theanine does not replace sleep, stress management, or mental health care.

No supplement alone has been shown to produce long-term meditation-style neural changes.


Safety, and Who Should Skip It

L-theanine has a good safety profile in healthy adults at typical doses. For your safety, it's worth noting the exceptions:

  • If you are pregnant or breastfeeding, talk to your healthcare professional first.
  • If you are taking blood pressure medication or sedatives, talk to your healthcare professional.
  • For children, we recommend consulting a pediatrician.
  • Especially for GABA: Research on oral supplementation has yielded mixed results, and we've explained why elsewhere.
  • Vitamin D3 in Calm & Clarity Mints contributes toward your daily total, so be aware of this if you are taking another D3 supplement.


FAQs

Can L-theanine replace meditation?

No. L-theanine research shows EEG changes consistent with relaxation, but these are NOT equivalent to the cognitive and emotional benefits of regular meditation practice.

How much L-theanine is in Neuro gum and mints?

Neuro Energy & Focus Gum and Memory & Focus Gum contain 60mg of L-theanine per piece.

Do I need to take L-theanine every time I meditate?

No. L-theanine is optional. The practice itself produces alpha wave increases. Some users find it supportive on specific days (high stress, difficulty focusing), not as a daily requirement.

Which Neuro product is best for meditation?

It depends on your goal. Memory & Focus Gum (caffeine-free, contains L-theanine + Cereboost® Ginseng) for focused concentration practice. Calm & Clarity Mints (GABA + L-theanine + Vitamin D3) for relaxation-focused practice.

Do I have to close my eyes for alpha waves?

Alpha is more prominent in eyes-closed states classically, but it's been observed in open-eyed relaxed attention too. Different meditation styles produce different EEG signatures.



*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.

Tags: cognitive performance
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It should be taken into consideration that this combination targets the exact cognitive strain you face every day.   The Caffeine Total Nobody Tracks Think about a typical sales day: a coffee to wake up, another mid-morning, a third to fight the post-lunch crash, and maybe one last cup before that late demo. We rarely count them, but the total adds up fast. The FDA draws the safety line at 400mg of caffeine a day for healthy adults. To put that in perspective, just two large coffee-shop coffees can easily push you past the halfway mark. That 5:00 PM caffeine fix is still floating around in your system at bedtime. When you lose sleep, tomorrow's calls are the ones that pay the price. Setting a strict caffeine cut-off time is the single best habit you can build. Pick an hour, stick to it, and handle the late afternoon with smart scheduling and real breaks instead.  The Thing That Beats All of This Sometimes there's no need to look far for the answer. If you only slept five hours last night, your high-stakes calls are already playing on "hard mode." A day of consecutive high-stakes conversations on a few hours of sleep cannot be rescued by scheduling, breaks, routine, or coffee. So cancel those low-priority internal syncs and go get some sleep.  Once the sleep is sorted, a bit of support can make a long meeting day easier to get through. Neuro's Energy & Focus line combines natural caffeine with L-theanine in a pocket-sized piece, and the standard gum's 40mg dose makes it easy to keep count before that 3 pm call. If caffeine doesn't sit well with you, or the last meeting runs late and you'd rather protect tonight's sleep, reach for Memory & Focus instead. It's caffeine-free, made with Cereboost® American Ginseng, L-theanine and B vitamins, so it’s perfect for any time of day.   FAQs 1. Is gum acceptable in a client meeting? In-person, most people prefer to finish their gum before a face-to-face conversation begins; it is a judgment call about the room. On video calls, it is generally unnoticeable. If you would rather have a mint format for client-facing settings, Energy & Focus Mints pack the same 40mg of natural caffeine with L-theanine, Vitamin B6 and Vitamin B12. 2. So what about that 4 pm demo?  Here's the not-so-secret answer: move it. If you have any say in your calendar, get your highest-stakes conversations out of your energy dead zone and into a time when your brain is actually showing up for work. Can't move it? No problem. A protected break beforehand and a consistent pre-call routine will set you up better than a third cup of coffee. 3. Won't more caffeine make me sharper for a big call?  Not reliably. And there's a catch. Load up too much and you're more likely to get the jitters, which is not the vibe when you need to be calm, cool, and close a deal. Go too late in the day and you'll pay for it at night, which means you'll pay for it again tomorrow. More isn't the move. Smarter is.  4. Does chewing gum help concentration?  The evidence is mixed. A study found chewing attenuated the vigilance decrement over a 30-minute task; another study found sustained attention improved while alertness and flexibility were adversely affected.  5. What about oral health if I'm chewing zero-sugar gum throughout the day?  Zero-sugar gum is generally viewed favorably in oral-health studies compared with sugar-containing alternatives. Your dentist is the right source for advice curated to you. *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.  

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Man studying for a new language using Memory & Focus gum

Polyglot Power: Cereboost® for Multilingual Recall

Learning multiple languages requires attention, strong memory, and language retrieval. This guide highlights the cognitive challenges of becoming a polyglot, effective study strategies, and the role of targeted cognitive support in language acquisition, addressing these: Polyglots demand more cognitive engagement in attention and task switching. For multilinguals, active language use and cross-linguistic switching matter more than working memory. Multilingual learners are likely to experience cross-linguistic interference. Vocabulary recall may be compromised by insufficient repetition, stress, and fatigue. The most effective learning methods include spaced repetition, active recall, interleaving, speaking and writing, dual coding, and adequate sleep. Cereboost® can support memory and attention, regardless of its untested effects on language learning. L-theanine can promote calmness and focused attention, mitigating speaking nerves. Cereboost® American Ginseng Extract and L-theanine can reinforce proven study methods rather than replace them. Caffeine-free supplements can suit late-night language practices, yet ginseng-medication interactions and relevant precautions should be considered. While speaking your second language, if you suddenly forget what to say, this situation may be related to memory overload. In such cases, mental fogginess may be experienced during long study sessions, and progress in vocabulary acquisition may also stall. At this point, polyglots and serious language learners begin to wonder about working memory.  Working memory is the mental workspace that holds new vocabulary, grammar patterns, and conversational flow when you are actively using them. This is also where Cereboost® and L-theanine can play a supportive role. This guide aims to clarify how the bilingual brain works and why vocabulary recall can become challenging.   The Bilingual Brain Is Already Working Hard Every time a bilingual or multilingual person speaks, their brain is doing more than retrieving words. Both language systems stay active at once, which means the brain constantly has to select the right language and suppress the other. Shook and Marian describe this as a kind of built-in mental workout: executive function, attention, and task switching all get exercised more heavily in bilingual brains than in monolingual ones. Why Bilinguals Have a Working Memory Advantage The idea of a bilingual working-memory advantage is quite popular and supported by some interesting findings. Nonetheless, some particular evidence suggests it depends profoundly on how the two languages are used day to day. Yang compared Korean monolinguals with Korean-English bilinguals. He found that simply knowing two languages didn’t guarantee a working memory advantage. He also noted what mattered more was whether someone regularly had to hold one language active while decoding the other in real conversation. Amoruso and colleagues reported that people living in more multilingual regions were roughly half as likely to show signs of accelerated biological aging compared with those in more monolingual regions, an effect researchers link to cognitive reserve built up through lifelong language use. Briefly, learning and using another language is one of the more demanding, and rewarding, workouts you can give your brain. Where Recall Fails, and Why Language learners may unexpectedly experience moments when familiar words slip away. There are a few well-documented reasons behind this, and none of them indicate a personal shortcoming. Limited Repetition Memory fades on a predictable curve unless it gets reinforced at the right intervals, an effect first mapped by Hermann Ebbinghaus over a century ago. This principle remains supported by modern spaced-repetition research. Passive Review Instead of Active Recall Re-reading a vocabulary list feels productive. Nevertheless, it mostly establishes familiarity rather than retrieval strength. That sort of familiarity is sometimes called the “illusion of mastery,” because it might be perceived as knowledge until you are asked to retrieve the word unaided. Poor Sleep Between Study Sessions Memory consolidation, the process that moves new vocabulary from short-term working memory into longer-term declarative memory, occurs mostly during sleep. Stress and Fatigue  Both stress and fatigue reduce how well new information gets encoded in the first place. This situation clearly explains why a rushed, intensive late-night study seldom leads to lasting retention. According to Dunlosky and colleagues, spaced repetition combined with active recall outperforms almost every other study technique available, including rereading, highlighting, and summarizing. Table I. Retention declines without review. Spaced repetition resets the curve before a word is forgotten. There is also a multilingual version of this finding. Your native language, or L1, and each additional language you are building, or L2 and beyond, compete for the same retrieval resources. That moment of reaching for a word and getting nothing is sometimes called the “tip-of-the-tongue experience.”  In this case, flashcard apps such as Anki, Duolingo and Pimsleur come to the forefront, since they are rooted in spaced, active recall, and these apps can deliver better language-learning outcomes by repetitively showing the same word. What the Research Says About Cereboost® American Ginseng and Working Memory Cereboost® is a patented extract of American ginseng, or Panax quinquefolius, standardized for consistent ginsenoside content and developed by Givaudan. It has been studied in three published randomized, placebo-controlled trials in healthy adults, all focused on working memory rather than language learning specifically. In the first trial, Scholey and colleagues gave 32 healthy young adults single doses of 100, 200, or 400 mg of the Cereboost® extract, and they found that working memory improved at all doses and across the one-to six-hour assessment period. In a subsequent trial, Ossoukhova and colleagues tested a single 200 mg dose in 52 healthy adults aged 40-60. The study showed a similar improvement in a composite working memory score, peaking around 3 hours after dosing. In a third trial, Bell and colleagues examined both a single dose and 2 weeks of daily use in 61 healthy young adults. The study reported improvements in working memory and attention, alongside early evidence pointing to the gut microbiome as one possible mechanism behind the effect. One thing to note: While the working memory gains are well-documented, there is no published study that has tested Cereboost® specifically on language-learning tasks, vocabulary recall, or word retrieval. However, it is reasonable to assume that working-memory support leads to faster vocabulary acquisition.   L-Theanine, the Calm Focus Partner The Alzheimer’s Drug Discovery Foundation describes L-theanine as an amino acid associated with relaxed alertness and increased alpha-wave activity, which may support focused attention. Also, Williams and colleagues reported that 200-400 mg of L-theanine per day may reduce stress and anxiety under acute stress.  Particularly for language learners, the effect of calm focus can have an obvious practical use. During speaking practice, anything that supports calm attention without sedation may be considered worthy of credit, separate from any working-memory claims. As an alternative, Neuro Memory & Focus Gum combines Cereboost® with L-theanine, vitamin B6 and B12, in a caffeine-free formula.     A Research-Backed Language Learning Routine It’s important to note that a supplement serves only as a supportive layer within a broader language-learning program, and it can’t replace a well-planned language learning routine. Daily Routine Template for Learners of Multiple Languages Morning, high cognitive demand: New vocabulary through Anki or another spaced repetition app. Listening practices with podcasts or native-language media. One piece of Neuro Memory & Focus Gum (if you want cognitive support without a caffeine crash later). Midday, consolidation: Real conversation practice through italki, Tandem, or an in-person exchange. Shadowing exercises, repeating audio in real time to develop pronunciation and rhythm. Evening, light review, protect your sleep: Passive language exposure through music or subtitled TV shows. Avoiding heavy caffeine at least 8 hours before your bedtime because memory consolidates during sleep. Neuro Memory & Focus Gum again if you want support during evening study without disrupting sleep, thanks to its caffeine-free format. Weekly: One immersion session of 2 or more hours. A full review of the prior week’s vocabulary. A day of proper rest to support memory consolidation. Prioritizing consistency over intensity while studying, sleeping 7-9 hours to protect what you have learned, and favoring conversation practices (3 non-negotiables based on the mentioned research above). A Sour Option for Afternoon Focus: Neuro Energy & Focus Sour Mints If you need something to focus during your afternoon study session and enjoy sour flavors, Neuro Energy & Focus Sour Mints may appeal to you. Available in sour apple, sour citrus, and sour berry flavors, it can satisfy unruly sour candy cravings while giving you a boost of energy and focus.  Each mint contains 40 mg of natural caffeine, 60 mg of L-theanine, Vitamin B6, and Vitamin B12, which can be helpful if you want extra support for your health. Neuro Mints are always vegan, zero sugar, and aspartame-free.    Thanks to Neuro Sour Mints, you get the sour flavor you crave and the energy you need to nail your midday conversation practice, without the dreaded sugar crash.   Beyond Supplements: What Actually Works The following methods may be helpful if you want to learn another language:  Spaced repetition systems  Systems such as Anki, RemNote and SuperMemo are grounded in the forgetting-curve research of Hermann Ebbinghaus. Active recalling over passive re-reading Roediger and Karpicke showed that students who practiced recalling information through testing retained significantly more one week later than other students who only re-read the material. Interleaving Interleaving means combining various grammar points or vocabulary types in a single session, rather than focusing on only one topic. It's shown to improve long-term retention even though it may feel more challenging at first. Output over input Speaking and writing force deeper, more effortful encoding than listening or reading on their own. This is one reason why immersion becomes more effective when it includes active language production instead of exposure alone. Dual coding Pairing a word with an image, gesture, or personal association creates a second memory pathway for lexical retrieval, which is why flashcards with pictures tend to outperform text-only cards. Sleeping  Both declarative memory, which involves facts and vocabulary, and procedural memory, which covers pronunciation and grammatical patterns, are consolidated during sleep. Spaced Repetition and Supplements Cereboost® American Ginseng and L-theanine are studied for general working memory and calm focus. Nonetheless, they haven’t been researched as specific language tools that can contribute to teaching a new language or help someone become a polyglot.  You can think of Cereboost® and L-theanine supplements as one layer of a detailed learning routine. If your language acquisition approach isn’t sufficiently aligned with your own learning style, no ingredient can compensate for that. Safety Notes for Language Learners Caffeine-free options are a popular choice for evening practice sessions, as conversation exchange sessions organized by online polyglot communities generally take place in the evening. Ginseng carries potential interactions with certain medications. Therefore, you should consult your healthcare provider before combining American ginseng with medication you currently use. This product is not recommended for anyone under 18 without healthcare provider guidance. If you are pregnant or breastfeeding, you should seek advice from your healthcare provider before use. FAQs Does Neuro Memory & Focus Gum help me learn languages faster? Supplements can’t teach you a language, since language-learning requires practice and your active involvement in the process. Nevertheless, Neuro Memory & Focus Gum contains Cereboost® American ginseng and L-theanine, both of which have research support for working memory and calm focus in healthy adults. Thus, they can add a small boost to your well-structured learning routine.  Is Neuro better than coffee during language study? It depends on your goal. Caffeine improves attention for a lot of people, but it can also lead to jitters in sensitive individuals, which tends to work against fluent speaking output. Since Neuro Memory & Focus Gum is caffeine-free, it can be regarded as a reasonable option for evening study. How long do I need to use it to see benefits? Research doses have ranged from a single acute dose, as in the Scholey and Ossoukhova trials, to 2 weeks of daily use, as in the trial of Bell and colleagues. Here, individual responses vary. If you are unsure, your healthcare provider is the right person to consult. Can I stack it with other nootropics? Since American ginseng has documented interactions with certain medications, consult your healthcare provider before adding any nootropic to your daily stack.  Will it help with “tip of the tongue” moments? The Cereboost® research focuses on working memory in lab-based tasks. There is no direct evidence yet that Cereboost® helps ease active word recall.  Find Your Neuro Study Support If you want to try a caffeine-free option built around Cereboost® American ginseng, L-theanine, Vitamin B6, and Vitamin B12, you can check out Neuro Memory & Focus Gum. For daytime study sessions where a little caffeine helps, you can also consider Neuro Energy & Focus Gum, which pairs 40 mg of natural caffeine with L-theanine. *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.  

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