Brain Fog: A Comprehensive Reference in the Nutrition and Natural-Health Context
1. Definition and Conceptual Framework
Brain fog has been used to refer to a variable set of overlapping symptoms implicating cognition, fatigue, and affect. It has been defined at various times as a distinct symptom, a syndrome, or a nonspecific term. It refers to symptoms that can affect memory, focus, concentration, and mental clarity, and is not a diagnosis itself, but a term used to describe how these symptoms feel.
Brain fog is associated with cognitive symptoms — predominantly difficulties with attention, memory, and language, contributing to a subjective "fog" or lack of "mental clarity." It overlaps with fatigue and psychiatric symptoms, including anxiety, depression, and dissociation, and is chronic but often transient or variable.
"Brain fog" is a term used in both social discourses and the literature to describe a subjective phenomenon of perceived cognitive dysfunction. It is a multifaceted experience associated with numerous conditions where chronic pain is also a key feature.
Brain fog is reported in a broad and seemingly unrelated set of conditions including COVID, menopause, hypothyroidism, traumatic brain injury (TBI), chronic fatigue syndrome (CFS/ME), fibromyalgia, and systemic lupus erythematosus (SLE).
2. Presentation and Symptoms
People who experience brain fog sometimes describe it as feeling mentally unclear, unfocused, or slowed down. Symptoms may include forgetfulness, trouble concentrating, confusion, difficulty finding words, mental fatigue, and reduced focus. Examples include forgetting why you entered a room, losing your train of thought, struggling to focus at work or school, or needing extra time to process information.
Four key features of brain fog have been identified in research: perceived variability, subjective cognitive dysfunction, participation limitations, and changes in functional activities.
Several studies have identified cognitive performance impairments shared across multiple diagnoses consistent with descriptions of brain fog, such as slowed processing speed and increased fatigability or decreased sustained attention.
The characteristic clustering of brain fog symptoms may also result from interrelations between perceived cognition and depression, anxiety, fatigue, and distraction by somatic symptoms or rumination. A systematic review of subjective cognitive symptoms in non-neurological chronic diseases reported a strong association between self-reported cognitive function and non-cognitive factors including depression and fatigue, but no correlation between self-reported cognitive symptoms and neuropsychological test results in most studies.
3. Body Systems Involved
3.1 Central Nervous System
Subjective brain fog may co-occur with changes in brain systems linked to attention and memory. Research on post-COVID brain fog in particular has pointed toward impaired brain perfusion and altered neural network activity as objective correlates.
3.2 Immune System and Neuroinflammation
Evidence suggests that disruptions in the gut microbiome, termed dysbiosis, may contribute to neurodegenerative and cognitive processes by altering immune responses, increasing intestinal and blood-brain barrier permeability, and producing neurotoxic metabolites. Gut dysbiosis can lead to increased systemic inflammation and neuroinflammation, both of which are key contributors to neurological disease pathology.
3.3 The Gut-Brain Axis
Intestinal bacteria can affect central nervous system (CNS) physiology and inflammation. The nervous system and the gastrointestinal tract communicate through a bidirectional network of signaling pathways called the gut-brain axis, which consists of multiple connections including the vagus nerve, the immune system, and bacterial metabolites and products.
During dysbiosis, these pathways are dysregulated and associated with altered permeability of the blood-brain barrier and neuroinflammation.
The microbiota–gut–brain axis (MGBA) is an intricate bidirectional communication network that links intestinal microbiota with the CNS through immune, neural, endocrine, and metabolic pathways. Microbial metabolites, such as short-chain fatty acids, tryptophan derivatives, and bile acids, interact with the host to influence CNS functions.
Microbes can produce neuroactive molecules that directly contribute to communication between the gut and the brain. Neurotransmitters, such as acetylcholine, GABA, and serotonin, produced by bacteria belonging to Lactobacillus, Bifidobacteria, Enterococcus, and Streptococcus species, can influence brain cell physiology directly and indirectly. Notably, approximately 90% of serotonin required for mood, behavior, and sleep is produced in the gut.
3.4 Endocrine System
Sleep disturbances and cognitive difficulties, often termed brain fog, are common complaints during menopause. Research reveals that these symptoms are intricately linked to neuroendocrine changes, particularly the decline in estrogen levels.
3.5 Mitochondrial and Metabolic Pathways
Research has illustrated overlapping categories of contributors to brain fog including neuroanatomical and neurophysiological, mental health/emotional, and environmental/lifestyle factors. Cognitive, biological, and environmental factors may act independently or synergistically to produce symptoms of brain fog. These symptoms primarily appear as impairments to cognition, sleep, and quality of life and may act bidirectionally to contribute to the experience of brain fog.
4. Contributing and Associated Factors
4.1 Chronic Disease Associations
Brain fog is reported across a broad set of conditions including COVID-19 (long COVID), menopause, hypothyroidism, traumatic brain injury, chronic fatigue syndrome (CFS/ME), fibromyalgia, and systemic lupus erythematosus.
Approximately 15% to 40% of persons with chronic pain as a primary disorder experience brain fog.
4.2 Neuroinflammation
The gut-brain connection influences neurodegenerative diseases, cognitive functions, and mental health disorders. Microbial imbalances cause neuroinflammation, neurotransmitter dysregulation, and disease progression.
4.3 Sleep Disruption
Brain fog is characterized by cognitive difficulties such as memory impairment, lack of focus, and mental fatigue. Research exploring potential triggers has examined sleep quality, mood, and gastrointestinal health, as well as the link between diet and brain fog severity. Brain fog scores are positively correlated with gastrointestinal symptom scores.
4.4 Psychological and Stress-Related Factors
The term "brain fog" has been used both colloquially and in research in reference to various neurocognitive phenomena that detract from cognitive efficiency, and is most commonly defined as the subjective experience of cognitive difficulties. PTSD psychopathology across cognitive, affective, and physiological symptom domains has been tied to brain fog. Furthermore, dissociative symptoms common in PTSD also contribute to the experience of brain fog.
4.5 Nutritional Deficiencies
Causes of brain fog can include poor sleep, stress, illness, medications, hormonal changes, nutritional issues, and underlying health conditions.
Pyridoxine (vitamin B6), folic acid (vitamin B9), and cobalamin (vitamin B12) are necessary cofactors for the synthesis of myelin and neurotransmitters. A decrease in levels of these vitamins is associated with elevated homocysteine levels, risk of cognitive impairment, and depression.
5. Nutrients Studied in Relation to Brain Fog and Cognitive Function
5.1 Omega-3 Fatty Acids (EPA and DHA)
Traditional Use
Fatty fish consumption has been a cornerstone of traditional dietary patterns in coastal and Nordic cultures for centuries, with these populations observing broad health benefits from diets rich in marine foods. The cognitive value of such diets was recognized empirically long before the identification of omega-3 fatty acids as discrete nutrients.
Scientific Evidence
It has been documented that omega-3 fatty acids help maintain brain health and cognitive function in healthy adults.
A systematic review and dose-response meta-analysis assessed the relationship between omega-3 dosage and cognitive outcomes in adults, with a systematic search conducted in PubMed, Scopus, and ISI Web of Science. Only randomized controlled trials (RCTs) were included. Each 2,000 mg/day omega-3 supplementation showed a significant improvement in attention (SMD: 0.98; 95% CI: 0.41, 1.54; GRADE = low) and perceptual speed (SMD: 0.50; 95% CI: 0.05, 0.95; GRADE = moderate). The evidence was graded as low to moderate, indicating that further large, well-designed trials are needed.
A randomized trial (VITACOG) in people with mild cognitive impairment (MCI) found that B vitamin treatment to lower homocysteine slowed the rate of cognitive and clinical decline. When omega-3 fatty acid concentrations are low, B vitamin treatment has no effect on cognitive decline in MCI, but when omega-3 levels are in the upper normal range, B vitamins interact to slow cognitive decline. This interaction finding from a secondary analysis suggests the two nutrient classes may have synergistic relevance to cognitive maintenance.
5.2 B Vitamins (B6, Folate/B9, B12)
Traditional Use
B vitamins are found abundantly in whole grains, legumes, leafy vegetables, and animal products. Traditional whole-food dietary patterns across multiple cultures — including Mediterranean, South Asian, and East Asian cuisines — provided these vitamins in their naturally occurring food matrices, though the concept of specific vitamin supplementation is a modern development.
Scientific Evidence
Low levels of vitamin B12 have been associated with neurocognitive disorders. Based on low to moderate quality of evidence, treatment with vitamin B12 and folate in patients with mild cognitive impairment seems to slow the rate of brain atrophy.
Vitamin B12 deficiency (below 150 pmol/L) is associated with cognitive impairment. Vitamin B12 supplements administered orally or parenterally at high dose (1 mg daily) were effective in correcting biochemical deficiency, but improved cognition only in patients with pre-existing vitamin B12 deficiency.
A systematic review and meta-analysis including 16 RCTs with 6,276 participants found no evidence for an effect of B12 alone or B-complex supplementation on any subdomain of cognitive function outcomes in populations without overt deficiency. In most cases, such complaints are not associated with overt vitamin B12 deficiency or advanced neurological disorders, and the effectiveness of vitamin B12 supplementation in such cases is uncertain.
Longitudinal studies suggest that changes in B12 biomarkers precede clinical symptoms of cognitive decline by several years, highlighting the importance of early intervention. The synergistic benefits of B vitamins, including folate and vitamin B6, are also noteworthy, as they collectively mitigate neuroinflammation, enhance DNA repair, and promote methylation, reducing the risk of age-related cognitive decline.
Evidence strength: Moderate quality evidence supports B vitamin supplementation improving cognition specifically in cases of confirmed deficiency. For those without deficiency, evidence from multiple RCTs does not support a benefit. The combination of adequate omega-3 status with B-vitamin therapy appears more promising than either intervention alone, based on the VITACOG trial secondary analysis.
5.3 Vitamin D
Traditional Use
Vitamin D status has historically been maintained through sun exposure and consumption of fatty fish and liver in traditional Northern European and coastal diets. Rickets and other conditions of deficiency were observed empirically before the vitamin was isolated.
Scientific Evidence
Clinical trials in humans have assessed the effects of vitamin D on cognitive function, and it is included among the twenty-one categories of nutrients and phytonutrients reviewed in major narrative reviews of nutritional cognition research. The VITAL-Cog trial (NCT01669915), a large randomized trial conducted at Brigham and Women's Hospital, specifically investigated the effect of vitamin D and omega-3 supplementation on cognitive decline in older adults, though overall results in cognitively healthy subjects were not significantly favorable. Evidence for vitamin D as a targeted intervention for brain fog in the general population remains preliminary.
5.4 Magnesium
Traditional Use
Magnesium is naturally abundant in legumes, nuts, seeds, and leafy green vegetables, all of which are dietary staples of traditional cuisines across Africa, the Americas, and the Mediterranean. No specific historical tradition used isolated magnesium for cognitive complaints, but diets high in magnesium-rich whole foods have long been associated with general health.
Scientific Evidence
Magnesium is listed among the twenty-one categories of nutrients reviewed in clinical trials assessing cognitive function outcomes. Magnesium plays a fundamental role in over 300 enzymatic reactions, including those involved in energy production, protein synthesis, and neurotransmitter regulation. However, as of current reviews, the specific clinical evidence base for magnesium supplementation targeting brain fog as a distinct entity remains limited, and further well-designed RCTs are needed.
6. Herbs and Natural Ingredients Studied in Relation to Brain Fog
6.1 Bacopa monnieri (Brahmi)
Traditional Use
Bacopa monnieri has been used in Ayurvedic medicine for centuries as a "Medhya Rasayana" (mind rejuvenator). In classical Ayurvedic texts, it was prepared as a decoction or ghee-based preparation and administered to children and adults to enhance memory, learning, and mental clarity.
Scientific Evidence
A systematic review of twenty-two clinical trials demonstrated that Bacopa monnieri (BM) can reduce Nuclear Factor-ÎşB phosphorylation, improve emotional function, cognitive functions, sleep routine, attention deficit, learning problems, memory retention, and psychiatric problems.
In a clinical trial with healthy medical students, subjects (n=46) were randomized to 150 mg of a standardized extract of Bacopa monnieri or placebo twice daily for 6 weeks. At the 6-week assessment, the digit span backwards test (measuring attention and working memory) and the logical memory test significantly improved in the Bacopa group compared to placebo. No adverse effects were reported.
Across the clinical trial literature, dosages of Bacopa monnieri have varied from 160 to 640 mg, and treatment periods from four weeks to six months.
Evidence strength: Moderate, based on multiple RCTs and a systematic review. Effects appear most consistently in memory and attention domains. Longer treatment durations (typically 12 weeks or more) tend to show more pronounced benefit. Small sample sizes and heterogeneity across trials limit definitive conclusions.
6.2 Hericium erinaceus (Lion's Mane Mushroom)
Traditional Use
Hericium erinaceus, commonly known as lion's mane mushroom, is a known substance among practitioners of Chinese medicine. Among all culinary mushrooms, Hericium erinaceus has been widely reported to have therapeutic activities related to the promotion of nerve and brain health. It has been used in East Asian traditional medicine and cuisine — particularly in China and Japan — for centuries, prepared as a food, tea, or dried powder.
Scientific Evidence
H. erinaceus contains a range of compounds with a variety of biological activities, including erinacines and hericenones, which enhance nerve growth factor (NGF) release. Hericenones were typically found in the fruiting bodies while erinacines were derived from the mycelia of the mushroom.
Preclinical studies have demonstrated that bioactive compounds in lion's mane, such as hericenones and erinacines, can promote NGF synthesis and potentially support neuroplasticity. These findings suggest that consuming lion's mane may have cognitive benefits even in the absence of pathology.
Despite being an ingredient used both culinarily and therapeutically in the East, limited research has focused on the immediate effects of H. erinaceus on the cognitive function and mood of healthy young adults. In an acute randomized, placebo-controlled, double-blinded, cross-over intervention study, investigators examined the effects of an acute dose of H. erinaceus fruiting body extract (3 g of 10:1 extract) on cognitive performance and mood. Eighteen healthy participants aged 18 to 35 years took part.
Cognitive effects with lion's mane have been mixed based on small and short-duration clinical trials. Preclinical studies suggest that lion's mane may be able to increase levels of NGF, which increases the length of nerve cell processes. Clinical trials testing lion's mane interventions have included small numbers of participants with short durations of treatment. Well-designed, larger, and longer clinical trials are needed.
Evidence strength: Preliminary to moderate. Preclinical (animal and in vitro) data for NGF stimulation is relatively consistent. Human clinical trial evidence is limited by small sample sizes and short durations, and results are mixed. The overall body of human evidence is insufficient to draw firm conclusions about dose, duration, or the magnitude of cognitive effects.
6.3 Withania somnifera (Ashwagandha)
Traditional Use
Ashwagandha (Withania somnifera), an essential medicine in Ayurveda, is reportedly beneficial in reducing stress and improving memory. In classical Ayurvedic practice, the root was prepared as a powder (churna) in milk or ghee and used as a Rasayana (rejuvenating tonic) to promote physical and mental resilience, and to counter the effects of chronic stress.
Scientific Evidence
In a prospective, randomized, double-blind, placebo-controlled pilot study involving 50 subjects with mild cognitive impairment, subjects were treated with either ashwagandha root extract (300 mg twice daily) or placebo for eight weeks. The ashwagandha treatment group demonstrated significant improvements in both immediate and general memory tests compared to the placebo group. The treatment group also showed significant improvement in executive function, sustained attention, and information-processing speed.
A double-blind, randomized, placebo-controlled clinical study evaluated the effect of ashwagandha root extract (300 mg sustained-release) on cognitive functions, stress levels, sleep quality, and overall well-being in stressed subjects. Healthy cognitively sound adults (n=130, aged 20–55 years) with elevated perceived stress scores were randomized to receive either ashwagandha or placebo for 90 consecutive days. CANTAB-assessed recall memory significantly improved, and the total error rate in recalling patterns significantly decreased in the ashwagandha group versus placebo. Lower perceived stress scores, serum cortisol levels, and sleep quality index scores — as well as higher happiness scores — were seen in the ashwagandha group.
Evidence strength: Preliminary to moderate. Current RCTs are generally small, with most conducted in India. Results are promising for stress-related cognitive impairment and mild cognitive impairment, but larger, more geographically diverse trials are needed.
6.4 Ginkgo biloba
Traditional Use
Ginkgo biloba leaves are one of the popular herbal medicines and are recorded in the Chinese Pharmacopoeia (2015 edition). The leaves and seeds have been used in traditional Chinese medicine for thousands of years, primarily for conditions involving poor circulation and memory decline in older age. In European botanical medicine, standardized leaf extracts came into use in the 20th century.
Scientific Evidence
The active ingredients of Ginkgo biloba extract include flavonoids, terpenoids, and terpene lactones (ginkgolide and bilobalide). Ginkgo biloba extract (GBE) is increasingly used to alleviate symptoms of age-related cognitive impairment, with preclinical evidence pointing to a pro-cholinergic effect.
Clinical studies on the treatment of Alzheimer's disease with Ginkgo biloba leaf extract (EGb) have been reported since the 1980s, and many clinical studies have been carried out over the following 30 years. However, the benefits of EGb on the treatment of Alzheimer's disease are still controversial. Analysis of the available clinical trial data suggests EGb may be able to improve cognitive function in patients with mild dementia during long-term administration (more than 24 weeks) at an appropriate dosage (240 mg per day).
Results from studies in healthy persons are mixed. Despite a lack of conclusive evidence, sales of Ginkgo products worldwide are increasing. A 2002 review of 9 trials concluded that there was not sufficient evidence to advocate Ginkgo for cognitive enhancement in healthy populations.
Ginkgo biloba has been extensively studied, yielding mixed results.
Evidence strength: Mixed to moderate in populations with mild cognitive impairment; insufficient in healthy adults. Most consistent benefit data derives from trials using standardized EGb 761 extract at doses of 240 mg/day for at least 24 weeks.
6.5 Curcumin (from Turmeric, Curcuma longa)
Traditional Use
Turmeric has been used in Ayurvedic and traditional Chinese medicine for thousands of years as an anti-inflammatory and tonic. In Ayurveda, it was prepared as a paste or decoction — commonly in milk ("golden milk" or haldi doodh) — for a wide range of inflammatory and neurological complaints.
Scientific Evidence
Polyphenols including curcumin have shown potential in improving cognitive function and protecting against neurodegeneration in clinical trial data. Curcumin's poor bioavailability in its native form has been a limiting factor in human research; formulations with piperine or lipid-based delivery systems have been studied to improve absorption. Turmeric is among the twenty-one categories of nutrients and phytonutrients assessed in clinical trials examining cognitive function in humans. Evidence from human trials remains preliminary, with most positive results coming from small trials in populations with mild memory concerns.
7. Dietary and Lifestyle Factors
7.1 Dietary Patterns
Nutritional factors implicated in the pathogenesis of brain fog have been assessed with particular emphasis on inflammatory processes, gut-brain axis dysfunction, and sleep dysregulation, highlighting dietary interventions that may modulate their roles in cognitive impairment.
Numerous studies have indicated that the Mediterranean diet correlates with reduced expression of proinflammatory pathways and increased expression of neuroprotective pathways. Furthermore, extra virgin olive oil, a significant component of the Mediterranean diet, has been shown to decrease astrocyte and microglial cell activation by lowering the production of inflammatory cytokines, and its antioxidant effects may support brain antioxidant enzymes and diminish levels of reactive oxygen species.
The Dietary Approaches to Stop Hypertension (DASH) diet, which highlights high consumption of fruits, vegetables, whole grains, low-fat dairy products, and reduced sodium intake, has also been linked to a slower cognitive decline.
Research has also explored the link between adherence to the MIND diet and brain fog severity. Brain fog scores were positively correlated with gastrointestinal symptom scores, while the association with MIND diet adherence was not statistically significant in the cross-sectional study examined, suggesting that GI health may be a more proximal contributor to brain fog than dietary pattern adherence alone.
7.2 The Gut Microbiome and Fermented Foods
The human microbiota has a fundamental role in host physiology and pathology. Gut microbial alteration, also known as dysbiosis, is a condition associated not only with gastrointestinal disorders but also with diseases affecting other distal organs.
The gut microbiome is involved in the production of various neuroactive compounds, including neurotransmitters and short-chain fatty acids, which can directly influence brain function.
7.3 Sleep Quality
Diet and dietary components can influence brain fog by regulating inflammation, modulating gut microbiota, and affecting sleep quality. Research in long COVID populations and in the general population has consistently found that poor sleep quality is associated with greater subjective cognitive difficulties. Sleep disturbances and cognitive difficulties, often termed brain fog, are common complaints during menopause. These symptoms are intricately linked to neuroendocrine changes, particularly the decline in estrogen levels.
7.4 Physical Activity
Physical activity has been widely examined in the context of cognitive health. Treatment approaches targeting cognitive function, mood disorders, sleep disturbances, and inflammation are suggested to potentially provide benefits. Clinical management typically adopts a multidisciplinary approach that incorporates cognitive rehabilitation, management of comorbidities, and anti-inflammatory interventions to address the underlying pathophysiology. Aerobic exercise has been recognized as one such anti-inflammatory and pro-cognitive lifestyle intervention across multiple review bodies.
7.5 Stress and the HPA Axis
Disruptions in the HPA axis, altered immune activation, and gut microbiota disturbances have been shown to contribute to mood disorder pathology. Chronic low-grade inflammation is recognized as a key element in the development of depression, and elevated levels of circulating immune cells have been noted in individuals with major depressive disorder. These same mechanisms — HPA dysregulation, immune activation, and neuroinflammation — are widely implicated in brain fog across multiple conditions.
7.6 Evidence Gaps and Research Limitations
Currently, there is no specific treatment for brain fog. The term brain fog is increasingly used by patients and researchers, but is poorly defined. Understanding the symptom is important, as it is highly prevalent and linked to poor quality of life and social and occupational disability.
The majority of nutritional and herbal studies reviewed here are limited by small sample sizes, short intervention durations, heterogeneous outcome measures, and a lack of standardized operational definitions of brain fog itself. Most positive findings in herbal research derive from populations with pre-existing cognitive impairment rather than individuals experiencing brain fog in the absence of neurological disease. Evidence from healthy adult populations remains sparse, and dose-response relationships for most natural interventions are incompletely characterized.
References
- Defining brain fog across medical conditions — Trends in Neurosciences (2025)
- Defining Brain Fog – A Transdiagnostic Narrative Review — European Psychiatry via PMC (2025)
- Brain Fog: Causes, Symptoms & More — American Brain Foundation
- Understanding the Experience and Impacts of Brain Fog in Chronic Pain: A Scoping Review — PubMed (2023)
- Understanding the Experience and Impacts of Brain Fog in Chronic Pain: A Scoping Review — PMC
- Brain Fog and Cognitive Dysfunction in PTSD: An Evidence-Based Review — PubMed (2025)
- The Gut-Brain Axis: How Microbiota and Host Inflammasome Influence Brain Physiology and Pathology — PMC
- Dysbiosis of Gut Microbiota from the Perspective of the Gut-Brain Axis — PMC
- Neurodegenerative Disorders and the Gut-Microbiome-Brain Axis: A Literature Review — PMC
- Lion's Mane Mushroom (Hericium erinaceus): A Neuroprotective Fungus — PMC
- Omega-3 Fatty Acid Status Enhances the Prevention of Cognitive Decline by B Vitamins in Mild Cognitive Impairment — PMC
- Omega-3 Fatty Acid Status Enhances the Prevention of Cognitive Decline by B Vitamins in MCI — PubMed (VITACOG)
- A Systematic Review and Dose-Response Meta-Analysis of Omega-3 Supplementation on Cognitive Function — Scientific Reports (2025)
- Vitamin B12 and Cognitive Function: An Evidence-Based Analysis — PMC
- Vitamin B12 Deficiency and Cognitive Impairment: A Comprehensive Review — ScienceDirect (2025)
- Effects of Vitamin B12 Supplementation on Cognitive Function, Depressive Symptoms, and Fatigue: A Systematic Review and Meta-Analysis — PMC
- Cognitive Impairment and Vitamin B12: A Review — PubMed
- Neurological Implications of Vitamin B12 Deficiency in Diet: A Systematic Review and Meta-Analysis — PMC
- The Effects of Twenty-One Nutrients and Phytonutrients on Cognitive Function: A Narrative Review — PMC
- Investigating the Neuroprotective and Cognitive-Enhancing Effects of Bacopa monnieri: A Systematic Review — PMC
- Effects of a Standardized Bacopa monnieri Extract on Cognitive Performance, Anxiety, and Depression in the Elderly — PMC
- Neuroprotective Herbs for the Management of Alzheimer's Disease — PMC
- Efficacy and Safety of Ashwagandha Root Extract on Cognitive Functions in Healthy, Stressed Adults: A Randomized, Double-Blind, Placebo-Controlled Study — PMC
- Acute Effects of a Standardised Extract of Hericium erinaceus on Cognition and Mood in Healthy Younger Adults — PMC (2025)
- Neurohealth Properties of Hericium erinaceus Mycelia Enriched with Erinacines — PMC
- Lion's Mane & Your Brain — Alzheimer's Drug Discovery Foundation, Cognitive Vitality
- Ginkgo biloba for Cognitive Improvement in Healthy Individuals — PMC
- An Updated Review of Randomized Clinical Trials Testing Ginkgo biloba Extract on Cognitive Function — PMC
- Improving Cognitive Impairment through Chronic Consumption of Natural Compounds: A Systematic Review and Meta-Analysis — Frontiers in Aging Neuroscience (2024)
- Nutritional Approaches to Managing Brain Fog: Insights Into Neuroinflammation, the Gut-Brain Axis, and Sleep — PMC (2026)
- Nutritional Approaches to Managing Brain Fog — Current Nutrition Reports, Springer Nature (2026)
- How Are Brain Fog Symptoms Related to Diet, Sleep, Mood and Gastrointestinal Health? A Cross-Sectional Study — PubMed (2025)
- Sleep and Brain Function at Menopause — PMC
- Intervention Modalities for Brain Fog Caused by Long-COVID: Systematic Review — PMC (2024)
- Improving Cognitive Function with Nutritional Supplements in Aging: A Comprehensive Narrative Review — PMC
Go back