How this was researched: This article draws on peer-reviewed research in cognitive neuroscience, olfactory pathway physiology, and nervous system regulation. Cited studies are linked throughout. This content is educational, not medical advice.

TL;DR — Mental clarity is a physiological state with four neurochemical conditions: low adenosine, functional cortisol, an online prefrontal cortex, and unfragmented attention. When clarity is lost, the fastest route back is matching the intervention to whichever mechanism failed.

Quick Answer

1. Brain fog has five distinct causes (adenosine load, cortisol overactivation, context-switch fragmentation, sleep debt, dorsal vagal flatness), and each requires a different intervention.
2. FOCUS addresses adenosine-driven and sympathetic-driven fog through 1,8-cineole and yuzu hesperidin; CALM addresses cortisol-driven fog through GABA-A modulation.
3. The diagnostic question before reaching for any clarity tool is which mechanism is producing the fog; the wrong tool deepens the wrong state.

Mental clarity isn't something you can think your way to. It's a physiological state with specific neurochemical conditions that either exist or don't. Understanding what's actually producing the fog is the difference between reaching for the right tool and reaching for the wrong one.

This is the complete guide. It covers what mental clarity is at the nervous system level, the five distinct fog types and their mechanisms, the timing windows when clarity is most accessible, and the practical techniques that work. For the step-by-step practical guide, see six techniques for clarity right now.

Why Brain Fog Isn't One Thing

The experience of "I can't think clearly" has at least five distinct causes. Each requires a different intervention. Treating adenosine fog with a calming tool, or cortisol fog with a stimulant, makes the state worse, not better.

The adenosine-driven version is the post-lunch dip, the heavy-headed cognitive slowness that peaks in early afternoon. Adenosine accumulates throughout the day as a byproduct of neural activity; at high concentrations it competes with alertness signals. Modulating adenosine receptor signalling restores clarity. That's 1,8-cineole (FOCUS) or caffeine, with different rebound profiles [2].

The sympathetic-driven version is scattered, reactive, can't-settle cognitive impairment produced by elevated cortisol. Fragmented and reactive rather than heavy and slow. The prefrontal cortex is suppressed by amygdala dominance rather than by adenosine load. Cortisol reduction and GABA-A activation pull the system back. That's CALM rather than FOCUS [4].

Context-switch fragmentation is attention residue from multiple concurrent demands stacking into working-memory overload. Not fatigue, not stress, but the cognitive equivalent of too many tabs open. A deliberate transition cue and recovery time before re-engaging address this. A stimulant doesn't.

Sleep debt and recovery deficit show up as cumulative cognitive impairment from insufficient sleep or sustained overload without adequate recovery. No single-session intervention fully addresses this. The intervention is structural: recovery, not a reset tool.

Dorsal vagal flatness is the low-energy, going-through-the-motions cognitive state after sustained overload. Gentle orienting activation works here: GROUND, movement, a change of physical environment.

The diagnostic question before reaching for any clarity tool is which one of these is producing the fog.

Full five-type brain fog diagnostic → CALM, FOCUS, GROUND →

The Prefrontal Cortex Problem

The prefrontal cortex is the seat of executive function: rational thought, sustained attention, working memory, decision-making, and the ability to filter irrelevant information. It is also the most energetically expensive part of the brain and the most sensitive to both cortisol and adenosine.

Under stress, amygdala activation suppresses prefrontal function [1]. The brain makes an evolutionary trade-off, prioritising fast reactive processing over slow deliberate processing. Under adenosine load, prefrontal function degrades through energy depletion rather than active suppression.

In both cases the experience is similar ("I can't think"), but the mechanism and the intervention differ. Adding stimulation to a cortisol-driven fog sharpens an already-activated system and worsens it. Applying a calming tool to an adenosine-driven fog deepens the heaviness.

This is also why willpower doesn't fix fog. The prefrontal cortex is the part of the brain you'd need to fix it with, and the prefrontal cortex is exactly what's gone offline. Olfactory pathway interventions work here because scent reaches the olfactory cortex and amygdala without first passing through the thalamus, unlike the other senses, and without requiring prefrontal mediation [3].

Why your brain can't talk itself down → How Fragrance Compounds Act on the Nervous System →

The Context Switching Tax

One of the least-discussed causes of mental fog at work is the accumulative cost of context switching. Every transition between tasks, roles, or cognitive modes deposits attention residue, the cognitive tail of the previous context that bleeds into the next one.

By mid-afternoon, a typical knowledge worker has made dozens of context switches. Each one is small; the cumulative residue is not. The result is a scattered, fragmented attention state that feels like fog but is actually the working-memory backlog of too many unresolved contexts.

The intervention here isn't stimulation. A deliberate transition ritual marks the boundary between contexts and gives the nervous system a clear signal that the previous context has closed. This is one of the core use cases for functional fragrance: marking transitions, not boosting productivity.

Context switching is wrecking your nervous system → The psychology of reset rituals →

Timing: When Clarity Is Most Accessible

Mental clarity isn't uniformly available across the day. The cortisol awakening response (a natural spike in cortisol in the first 60–90 minutes after waking) primes the brain for demanding cognitive work. Working with this window rather than against it is the highest-leverage clarity intervention available.

The adenosine trough (the natural dip in alertness in early afternoon) is the low point of cognitive availability for most people. Interventions applied at the start of the dip (around 1:30pm) produce better results than those applied at the bottom of it an hour later.

Late afternoon and evening cognitive work increasingly competes with rising adenosine and, for many people, elevated cortisol from a day of accumulated demands. The clarity available at 4pm is structurally less than at 9am regardless of intervention.

Best times of day for functional fragrance →

What FOCUS Does, and Doesn't Do

FOCUS is formulated for adenosine-driven cognitive fog and sympathetic-driven scatter, the two most common workday clarity problems. Its compound profile (1,8-cineole, yuzu hesperidin, mint) addresses the mechanisms of those states rather than adding generalised stimulation.

What it does: modulates adenosine receptor signalling, suppresses sympathetic activation, provides immediate trigeminal sensory re-anchoring. Used at the right moment (start of the post-lunch dip, before a demanding focus session, after a context-switching meeting), it addresses the mechanism of the fog.

What it doesn't do: compensate for sleep debt, address dorsal vagal flatness (that's GROUND), or help with stress-driven fog when the nervous system needs calming rather than sharpening (that's CALM).

The most common misuse: reaching for FOCUS when the system is activated and scattered rather than depleted and foggy. An alerting tool on an already-activated system adds to the activation.

Full FOCUS science →

Six Techniques for Clarity Right Now

Technique 1: Clear the Working Memory Backlog

One under-recognized contributor to mental fogginess is working memory overload — too many open loops held in active memory simultaneously. Every unfinished task, unresolved question, and pending decision the brain is tracking consumes working memory capacity. Context switching accelerates this throughout the day, depositing attention residue with each switch. (How context switching loads the nervous system.) When that capacity is fully occupied, the cognitive resources available for clear thinking are diminished.

The fastest intervention: a two-minute written capture. Everything that's open — every task, every worry, every "I need to remember to..." — gets written down in whatever order it surfaces. Not organized, not prioritized. Just out of your head and onto paper.

The act of externalizing the loops tells the brain it no longer needs to hold them actively. Working memory partial-frees. The fog often lifts noticeably in the few minutes after a thorough capture.

This is the one technique on this list that doesn't require a specific nervous system state to execute — it works regardless of how foggy you are, because it only requires writing, not thinking.

Technique 2: Activating Breath for Immediate Cognitive Sharpness

Extended exhale breathing (the technique covered in work stress relief) activates the parasympathetic nervous system — ideal for stress and overwhelm. For mental fog specifically, you sometimes need the opposite: a breath pattern that increases alertness and mental sharpness rather than reducing arousal.

The physiological sigh variant: two quick inhales through the nose (the second stacked immediately on the first, filling the lungs completely), followed by a long, controlled exhale through the mouth. The double inhale maximizes oxygen intake and deflates collapsed air sacs in the lungs; the controlled exhale clears CO2 efficiently.[5] The result is a rapid shift in blood gas balance that many people describe as immediate cognitive sharpening.

Three cycles, then a pause to assess. This is a brief activation technique, not a sustained practice.

Add the scent layer: Spray FOCUS before you begin. The eucalyptus and mint in FOCUS work alongside the breath activation — eucalyptus studied for sustained attention,[6] mint for immediate sensory sharpness.[7] These are functional ingredients: selected for documented physiological effect, not scent profile alone. Yuzu contributes to tension reduction and mood support.[8]

Technique 3: Visual Focus Reset

Mental fog often manifests partly in visual processing — a softening of focus, a sense of looking without fully seeing, the visual equivalent of unclear thinking. The Refocus Blink is a short technique that uses deliberate blink sequences and controlled visual focus to reset this.

The mechanism: the visual cortex and the prefrontal cortex are neurologically connected in ways that mean deliberate visual sharpening can support cognitive sharpening. This is a small effect, but at low cost — the technique takes under 60 seconds and requires nothing except attention.

Use this immediately before the cognitive work you need mental clarity for, not in the middle of it.

Technique 4: Sensory Anchoring to Exit the Fog Loop

Brain fog and anxiety often coexist in a reinforcing loop: the fog makes clear thinking harder, which creates frustration and low-grade anxiety about not being able to think, which elevates cortisol further, which deepens the fog. 5-4-3-2-1 grounding interrupts this loop at the sensory level.

The technique works here because it redirects attentional resources away from the meta-experience of being foggy ("I can't think straight, why can't I think straight") and toward concrete sensory present-moment experience. The fog doesn't disappear, but the anxiety loop around it stops — and cortisol, without the anxiety feeding it, begins to lower.

This is the technique to reach for when the fog has a quality of overwhelm or frustration attached to it, not just flat cognitive unavailability.

Technique 5: Movement as Prefrontal Reset

Short bursts of physical movement — particularly anything that crosses the body's midline or requires bilateral coordination — are among the most reliable ways to access the prefrontal cortex when it feels unavailable. The physiological mechanism involves increased cerebral blood flow, BDNF release,[9] and a brief sympathetic activation that clears the low-arousal fogginess without creating stress arousal.

This doesn't require a gym. Two minutes of deliberate movement in your workspace — walking, stretching with full extension, even alternating cross-body taps — is enough to create a measurable shift in cognitive availability.

Movement before demanding cognitive work, not only when you're already stuck. The effect is stronger as preparation than as rescue.

Technique 6: Eliminate the Source Temporarily

Some brain fog is caused by what you haven't removed rather than what you haven't added. Sustained screen exposure, continuous background noise, and the low-grade cognitive processing of an environment full of unrelated stimuli all contribute to the attentional depletion that shows up as fogginess.

A five-minute environmental intervention: screen off, quiet space, no inputs. Not a meditation. Not a technique. Just the absence of the input load that was sustaining the fog. This works fastest for people whose fog is primarily overstimulation-driven — and in the modern knowledge work environment, that's more common than it appears. (On what chronic overstimulation does to the nervous system.)

For the fuller framework on why overstimulation depletes mental clarity and what the nervous system is doing when it's overloaded, see: You're Not Stressed, You're Dysregulated →

Matching Technique to Cause

Mental fog has different causes that respond to different interventions. A quick diagnostic — and for a deeper guide to choosing between mists: CALM, FOCUS, GROUND →

These aren't mutually exclusive — brain fog usually has more than one contributor. Start with the one that matches the dominant quality of the fog, then add a second if needed.

Deep Work: Building the Conditions for Focus

Cal Newport's definition is useful: deep work is cognitively demanding work performed in a state of distraction-free concentration, pushing cognitive capability to its limit.[10] What the productivity literature around it tends to skip is the physiological precondition.

Deep work requires the brain to sustain focused attention over an extended period — typically 60–90 minutes minimum for genuinely complex output. That kind of sustained attention is metabolically expensive and physiologically demanding. It requires low background arousal, sufficient prefrontal cortex availability, and enough working memory capacity to hold complex problems in mind long enough to work through them.

Context switching, accumulated stress, and unresolved attention residue from the morning's interruptions all deplete exactly those resources. By the time you sit down to the work that matters, the conditions for doing it well may already be compromised.

What follows are seven approaches — ordered from environmental to physiological to behavioral — that build the conditions for deep work rather than assuming they'll arrive on their own.

1. Create an Environmental Cue That Signals Deep Work Mode

The brain runs on prediction. When you enter the same environment in the same way repeatedly, the brain begins to anticipate the state that followed — and to prepare for it before you've done anything deliberate.

This is the principle behind scent anchoring: pair a specific sensory input with a specific state consistently, and the sensory input alone begins to initiate the state. Use the same fragrance every time you begin deep work, and eventually the act of spraying it tells your nervous system what's coming — lowering the threshold for entry into focused attention. (How this conditioning builds over time.)

This sounds small. The mechanism is not. The olfactory pathway reaches the olfactory cortex and amygdala without first passing through the thalamus, unlike the other senses, and connects to the hippocampus — the regions that regulate emotional state, arousal level, and memory encoding. A sensory cue delivered through scent reaches these systems faster than any other input, before conscious thought catches up. (The mechanism explained here.)

FOCUS — eucalyptus, yuzu, and mint — is formulated for exactly this entry moment. Eucalyptus has been studied for its influence on sustained attention.[6] Yuzu for mood and tension reduction.[8] Mint for immediate sensory sharpening.

One to two sprays, one deliberate breath, before you begin. Every time.

2. Do a Micro-Reset Before Starting, Not After Getting Stuck

Most people use focus techniques reactively — reaching for a reset when they're already derailed. The more effective move is a two-minute nervous system preparation before you begin.

The Focus Line is designed for exactly this: a short visual anchoring practice that narrows attentional focus before a task requires it. The Refocus Blink resets visual and cognitive focus in under 60 seconds.

Two minutes before deep work beats twenty minutes of recovery after getting lost.

3. Protect the First 90 Minutes From Switches

Attention residue — the cognitive drag from unfinished tasks left behind after a switch — is the primary mechanism by which context switching degrades deep work capacity. (The full science is here.)

The practical implication: every task switch before deep work deposits residue that you'll carry into the session. Email, Slack, a quick conversation, a scan of the calendar — each one costs something. The more you've switched before sitting down to concentrated work, the less cognitive capacity you have available when you get there.

The single most effective structural protection for deep work is reserving it for before the switching begins. First thing in the morning, or immediately after a genuine break — not after two hours of reactive work. If your schedule doesn't allow morning deep work, a short transition ritual (see #4) can partially clear the residue before you begin.

4. Use a Transition Ritual to Clear Attention Residue

If deep work has to happen mid-day — after meetings, after email, after a round of context switches — a short deliberate transition between reactive work and focused work helps discharge accumulated arousal before it degrades the session.

This doesn't need to be elaborate. Three minutes of deliberate breathwork (4 counts in, 8 counts out — the Vagus Nerve Breath) moves the nervous system from sympathetic activation toward parasympathetic recovery. The Micro Pulse Align is a short practice specifically designed for the transition between different types of cognitive work.

Add the scent cue here too — spray FOCUS before the transition ritual, so the fragrance is already present when you begin the work itself.

5. Work With Your Ultradian Rhythm, Not Against It

The brain operates on ultradian cycles of approximately 90–120 minutes — alternating between higher and lower alertness throughout the day.[11] Peak focus capacity tends to cluster in the first half of each cycle. The second half is a natural recovery phase that the body will take regardless of whether you allow it to.

Working against this cycle — pushing through the low phase to hit an arbitrary time target — produces diminishing returns and higher cortisol. Working with it — scheduling deep work sessions to match peak phases, building in genuine recovery between them — produces more output from less total time.

The typical pattern for sustained deep work: 90-minute session, followed by a genuine break (not a switch to reactive work). Two sessions like this, well-protected, will generally outperform a full day of fragmented, reactive work.

6. Manage the Transition Out as Deliberately as the Start

How a deep work session ends affects the next one. Stopping mid-task — leaving something genuinely unfinished — creates attention residue that persists into the recovery period and degrades the next session's quality.

The Zeigarnik effect: the brain holds incomplete tasks in active memory, continuing to allocate attention to them even when conscious focus has moved elsewhere.[12] End deep work sessions at a natural stopping point when possible, or leave a brief written note of exactly where you stopped and what the next step is. This gives the brain permission to close the loop temporarily — reducing the residue that carries into recovery.

7. Treat Recovery as Part of the Work

Deep work is expensive. The prefrontal cortex uses disproportionate metabolic resources during sustained concentration. Recovery isn't a break from work — it's the restorative phase that makes the next session possible.

Recovery that actually works: genuine sensory downtime (not a switch to a different screen), movement, and a deliberate nervous system reset. The micro-resets library covers techniques that work in the gaps — between sessions, between meetings, at the transitions that shape what the next period of work can be. On why passive rest often isn't enough: Why Rest Doesn't Fix Burnout →

On the Mental Clarity Collection

The Brain Fog & Mental Clarity collection features FOCUS — the mist formulated specifically for the attentional and cognitive states covered here. The full micro-resets library includes additional techniques for focus, calm, and grounding that work alongside the approaches in this guide.

The Mental Clarity Library

Understanding the fog

• 5 Types of Brain Fog — And the Scent Profile for Each →
• Why Your Brain Can't Talk Itself Down →
• Context Switching Is Wrecking Your Nervous System →
• Polyvagal Theory: A Plain-Language Guide →

How to get clarity

• Best Times of Day for Functional Fragrance →
• Nervous System Reset →
• The 12 Best Nervous System Regulation Tools, Ranked →
• The Psychology of Reset Rituals →

The science

• FOCUS: The Cognitive Reset Mist →
• How Fragrance Compounds Act on the Nervous System →
• Benefits of Functional Fragrance →

FAQ

What is the best functional fragrance mist for mental clarity?

For most workday clarity problems, FOCUS is the best functional fragrance mist for mental clarity. Its compound profile (1,8-cineole, yuzu hesperidin, mint) addresses adenosine-driven fog and sympathetic-driven scatter, the two most common causes of mid-day cognitive impairment. For cortisol-driven scatter, CALM is the right tool first; once the system settles, FOCUS can re-sharpen attention.

What's the best mist for mental clarity at work?

FOCUS is designed for office and open-plan use. It's near-field on-body, meaning the scent is present to the wearer without projecting into shared space. The eucalyptus-yuzu-mint profile reads as clean rather than fragrant, and the Spray-Breathe-Shift ritual takes under ten seconds. Apply to wrists at the top of a deep work block or at the start of the post-lunch dip.

What's the best mist for the 2pm wall?

The 2pm wall is adenosine-driven, not energy-driven. The fastest intervention is FOCUS applied at the start of the dip (around 1:30pm), not at the bottom of it an hour later. 1,8-cineole modulates adenosine receptor signalling without the rebound profile of caffeine. Pair with a brief change of physical environment (standing, walking, daylight) for stacked effect.

What is mental clarity?

A physiological state in which adenosine levels are low enough for alertness signals to dominate, cortisol is in the functional range, the prefrontal cortex is online, and attentional resources haven't been depleted. It isn't a mindset or a decision; it has neurochemical conditions that either exist or are absent, which is why "just focus" fails and why matching the intervention to the mechanism works better.

What causes brain fog?

Five distinct mechanisms: adenosine accumulation (post-lunch fatigue), sympathetic overactivation (cortisol-driven scatter), context-switch fragmentation (attention residue), sleep or recovery deficit (structural depletion), and dorsal vagal flatness (post-overload withdrawal). Each requires a different intervention. Treating adenosine fog with a calming tool, or cortisol fog with a stimulant, makes the state worse not better. Full diagnostic →

How do I get mental clarity fast?

Match the intervention to the fog type. For adenosine-driven heaviness (post-lunch, slow and foggy): FOCUS via the Spray-Breathe-Shift, applied at the start of the dip rather than the bottom. For cortisol-driven scatter (reactive, fragmented, can't settle): CALM first to bring the activation down, then FOCUS if needed. For context-switch fragmentation: a deliberate transition ritual before re-engaging, not a stimulant. Fastest onset methods →

Does FOCUS help with mental clarity?

Yes. Specifically for adenosine-driven cognitive fog and sympathetic-driven scatter, which are the two most common workday clarity problems. 1,8-Cineole (eucalyptus) modulates adenosine receptor signalling; hesperidin and limonene (yuzu, grapefruit) suppress sympathetic activation; mint provides immediate trigeminal re-anchoring. It is not a general stimulant and is most effective when applied to the correct fog type at the correct moment. Full science →

Can I use FOCUS at work?

Yes. FOCUS is designed for near-field on-body use, meaning the scent is present to the wearer without projecting into shared space. Applied to wrists and brought intentionally to the nose (Spray-Breathe-Shift), it's appropriate for office, open-plan, and client-facing environments. The eucalyptus-yuzu-mint profile is clean and non-intrusive. Best use timing →

What's the difference between FOCUS and CALM for brain fog?

Fog type determines which tool. FOCUS for depletion states (heavy, slow, adenosine-driven, hard to initiate). CALM for activation states (scattered, reactive, cortisol-driven, hard to settle). If you're foggy and calm, use FOCUS. If you're foggy and wired, use CALM first. If you're not sure, the scent profile is a reliable guide: FOCUS's bright citrus and eucalyptus character will feel right when the system needs sharpening; CALM's warm spiced character will feel right when it needs settling. CALM, FOCUS, GROUND →

Is brain fog a medical condition?

Brain fog is a symptom, not a diagnosis. It can accompany many conditions — including chronic fatigue, thyroid dysfunction, long COVID, hormonal shifts, and others — and persistent or severe brain fog warrants evaluation by a healthcare provider. The techniques in this article address brain fog in the context of normal nervous system overload and cognitive depletion, not underlying medical causes.

How quickly can mental clarity improve?

The activating breath technique and written capture can produce noticeable shifts in minutes. The environmental elimination technique typically takes 5–10 minutes to clear overstimulation-driven fog. Movement resets are fast (2–3 minutes of effect onset). The techniques that build over time — scent anchoring, consistent sleep and recovery — improve baseline clarity over weeks.

What's the relationship between mental clarity and nervous system regulation?

Nervous system regulation is the broader capacity to move between nervous system states intentionally. Mental clarity is one expression of a well-regulated nervous system — specifically, the prefrontal cortex functioning at sufficient capacity. Chronic dysregulation (sustained high stress, poor sleep, accumulated context switching) degrades mental clarity chronically, not just acutely. For the underlying framework, see: You're Not Stressed, You're Dysregulated →

How long should a deep work session be?

Research on sustained cognitive performance suggests 90 minutes is the practical upper limit for high-quality concentrated output for most people. Shorter sessions (60 minutes) can be equally effective if the entry conditions are well-prepared. Below 45 minutes, the cognitive ramp-up time represents a significant proportion of the session.

What if I can't protect a full 90-minute block?

Shorter protected blocks are still worth doing. Even 45 uninterrupted minutes, well-prepared, produces better output than 90 fragmented ones. The key is eliminating switches within the block, not achieving a specific duration.

What's the difference between deep work and flow state?

Flow is a specific psychological state characterized by effortless absorption, loss of self-consciousness, and intrinsic reward. Deep work is the work practice that creates the conditions for flow — it doesn't guarantee flow, but makes it more likely. Flow cannot be forced; the nervous system conditions for deep work can be built deliberately.

References

[1] Arnsten, A.F.T. — "Stress signalling pathways that impair prefrontal cortex structure and function." Nature Reviews Neuroscience (2009). https://pubmed.ncbi.nlm.nih.gov/19455173/

[2] Moss, M. et al. — "Aromas of rosemary and lavender essential oils differentially affect cognition and mood in healthy adults." International Journal of Neuroscience (2003). https://pubmed.ncbi.nlm.nih.gov/12690999/

[3] Shepherd, G.M. — "The human sense of smell: are we better than we think?" PLOS Biology (2004). https://pubmed.ncbi.nlm.nih.gov/15138509/

[4] Linck, V.M. et al. — "Effects of inhaled Linalool in anxiety, social interaction and aggressive behavior in mice." Phytomedicine (2010). https://pubmed.ncbi.nlm.nih.gov/19879118/

[5] Balban, M.Y., Neri, E., Kogon, M.M., et al. (2023). Brief structured respiration practices enhance mood and reduce physiological arousal. Cell Reports Medicine, 4(1), 100895. https://doi.org/10.1016/j.xcrm.2022.100895

[6] Moss, M., & Oliver, L. (2012). Plasma 1,8-cineole correlates with cognitive performance following exposure to rosemary essential oil aroma. Therapeutic Advances in Psychopharmacology, 2(3), 103–113. https://doi.org/10.1177/2045125312436573

[7] Moss, M., Hewitt, S., Moss, L., & Wesnes, K. (2008). Modulation of cognitive performance and mood by aromas of peppermint and ylang-ylang. International Journal of Neuroscience, 118(1), 59–77. https://doi.org/10.1080/00207450601042094

[8] Matsumoto, T., Asakura, H., & Hayashi, T. (2014). Effects of olfactory stimulation from the fragrance of the Japanese citrus fruit yuzu (Citrus junos Sieb. ex Tanaka) on mood states and salivary chromogranin A as an endocrinologic stress marker. Journal of Alternative and Complementary Medicine, 20(6), 500–506. https://doi.org/10.1089/acm.2013.0425

[9] Cotman, C.W., & Berchtold, N.C. (2002). Exercise: a behavioral intervention to enhance brain health and plasticity. Trends in Neurosciences, 25(6), 295–301. https://doi.org/10.1016/S0166-2236(02)02143-4

[10] Newport, C. (2016). Deep Work: Rules for Focused Success in a Distracted World. Grand Central Publishing.

[11] Kleitman, N. (1982). Basic rest-activity cycle — 22 years later. Sleep, 5(4), 311–317. https://doi.org/10.1093/sleep/5.4.311

[12] Zeigarnik, B. (1927). Über das Behalten von erledigten und unerledigten Handlungen [On the retention of completed and uncompleted activities]. Psychologische Forschung, 9, 1–85.

→ Shop FOCUS

→ Try All Three: The Mood Toolkit

→ The 12 Best Nervous System Regulation Tools, Ranked by Speed and Friction

→ The Neuroscience of Nervous System Regulation

→ What Is Functional Fragrance? →

→ Functional Fragrance Glossary

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