Category: Health Notes

Health note: This is informational content, not medical advice. Supplements and health decisions are personal; check with a qualified clinician if it matters for your situation.

Step 1: Understand Creatine’s Basic Role

• What it is: Creatine is a naturally occurring compound synthesized in the body (liver, kidneys, pancreas) and obtained from diet (primarily meat and fish).

• Primary Function: It plays a crucial role in cellular energy metabolism, particularly in tissues with high and fluctuating energy demands, like muscle and brain.

• Mechanism: Creatine is phosphorylated to phosphocreatine (PCr) by the enzyme creatine kinase (CK). PCr acts as a rapidly accessible reserve of high-energy phosphate bonds. When energy (ATP – adenosine triphosphate) is used quickly, it becomes ADP (adenosine diphosphate). PCr can quickly donate its phosphate group back to ADP, regenerating ATP without needing slower processes like glycolysis or oxidative phosphorylation.

  • ADP + PCr <=> ATP + Cr (catalyzed by CK)

• Supplementation Goal: Supplementing with creatine (usually creatine monohydrate) increases the intramuscular and potentially intra-brain stores of both free creatine and PCr, enhancing this rapid energy buffering capacity.

Step 2: Creatine and Mental Fatigue (Cognitive Fatigue)

• The Hypothesis: Mental fatigue, particularly during demanding cognitive tasks or under stressful conditions (like sleep deprivation), might be linked to a localized depletion of brain energy reserves (ATP/PCr) or an inability to regenerate ATP quickly enough to meet demand. Supplementing creatine could potentially bolster these brain energy reserves, delaying fatigue onset or improving performance under demanding conditions.

• Academic Studies:

  • Evidence for Brain Uptake: Studies confirm that supplemental creatine can increase creatine concentrations in the brain, although the increase is typically less pronounced (~5-15%) than in muscle and may take longer or require higher doses. Brain uptake seems more significant when baseline levels are lower or energy metabolism is stressed.

  • Cognitive Performance under Stress: Several studies show that creatine supplementation can improve cognitive function (e.g., memory, reaction time, executive function) particularly under conditions that stress brain energy metabolism, such as:

    • Sleep Deprivation: Multiple studies demonstrate benefits in mitigating cognitive decline caused by sleep deprivation.

    • Hypoxia: Some evidence suggests benefits under oxygen-deprived conditions.

    • Complex Cognitive Tasks: Performance on demanding tasks requiring significant mental effort may be improved.

  • General Cognition in Healthy Adults: Evidence for benefits in healthy, non-stressed individuals performing routine tasks is less consistent. Some studies show no effect, while others show mild improvements.

  • Vegetarians/Vegans: Individuals with lower dietary creatine intake (vegetarians/vegans) often show more pronounced cognitive benefits from supplementation, likely because their baseline brain creatine levels are lower.

  • Mental Fatigue: Direct studies on “mental fatigue” as the primary outcome are fewer but generally align with the findings under stress. Creatine may help maintain performance for longer during cognitively demanding sessions.

• Internet Opinions/Anecdotes: Online forums (nootropics communities, biohackers) often feature positive anecdotal reports about creatine reducing “brain fog,” improving focus during long work/study sessions, and enhancing mental clarity, particularly when combined with good sleep hygiene and nutrition. However, others report no noticeable cognitive effects.

• Insights & Hypotheses:

  • Creatine is not a stimulant like caffeine. It likely works by providing more energy substrate, enabling the brain to sustain high activity levels for longer or recover faster.

  • The benefits seem most pronounced when the brain’s energy system is challenged (stress, fatigue, complex tasks).

  • Individual responses may vary based on diet, baseline creatine levels, genetics (creatine transporter efficiency), and the specific nature of the mental fatigue.

Step 3: Creatine and Post-COVID Fatigue (Long COVID)

• The Hypothesis: Post-COVID fatigue, often a core symptom of Long COVID, is complex and multifactorial. Potential underlying mechanisms include:

  • Mitochondrial Dysfunction: The virus may directly or indirectly impair mitochondrial function, reducing cellular energy production capacity.

  • Chronic Inflammation: Persistent low-grade inflammation can increase energy demands and interfere with normal cellular processes.

  • Endothelial Dysfunction/Microclots: Impaired blood flow could limit oxygen and nutrient delivery to tissues, including muscles and the brain.

  • Autonomic Dysfunction: Dysregulation of the autonomic nervous system can affect energy levels and recovery.

  • Muscle Deconditioning/Myopathy: Prolonged illness and inactivity can lead to muscle weakness and fatigue.

  • Brain Effects: Neuroinflammation or direct viral effects on the brain could contribute to central fatigue and brain fog.

  • Hypothesis: If impaired energy metabolism (especially mitochondrial dysfunction or simply increased demand due to chronic inflammation/repair) is a significant factor in post-COVID fatigue, creatine might help by providing an alternative, rapid pathway for ATP regeneration, potentially alleviating both physical and mental fatigue symptoms.

• Academic Studies:

  • Direct Evidence (Creatine & Long COVID): As of late 2023 / early 2024, there is very limited to no direct, high-quality clinical trial evidence specifically investigating creatine supplementation for Long COVID fatigue. This is a relatively new area of research focus.

  • Related Evidence (Chronic Fatigue Syndrome/ME): Some studies have explored creatine in Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS), a condition with overlapping symptoms (profound fatigue, post-exertional malaise, cognitive issues). Results have been mixed and inconclusive. Some small studies suggested potential benefits in muscle function or symptom scores, while others found no significant effect. ME/CFS itself is heterogeneous, making research challenging.

  • Related Evidence (Muscle Fatigue/Recovery): Creatine is well-established for improving muscle performance and reducing fatigue during high-intensity exercise. This could be relevant if muscle deconditioning or specific muscle energy deficits contribute to post-COVID fatigue, but Long COVID fatigue often goes beyond simple muscle tiredness (e.g., profound central fatigue, PEM).

  • Related Evidence (Brain Energy): As discussed for mental fatigue, creatine impacts brain energy. If post-COVID brain fog involves an energy deficit component, creatine could theoretically help.

• Internet Opinions/Anecdotes: Anecdotal reports online regarding creatine for Long COVID are varied. Some individuals report noticeable improvements in energy levels, reduced brain fog, and better exercise tolerance. Others report no benefit, and some even report feeling worse (though this could be coincidence or related to other factors/supplements). There’s significant discussion but little consensus based on personal experiences.

• Insights & Hypotheses:

  • Plausibility: The mechanistic link via energy metabolism makes creatine a plausible candidate for investigation in Long COVID.

  • Lack of Evidence: The current lack of direct clinical trial data is a major limitation. We don’t know if it works specifically for this complex condition, what the optimal dose might be, or if it interacts negatively with other Long COVID pathologies.

  • Heterogeneity: Long COVID is not a single entity; different individuals likely have different underlying primary drivers for their fatigue. Creatine might only help a subset of patients where energy metabolism is a key issue.

  • Risk of PEM: A major concern in Long COVID and ME/CFS is Post-Exertional Malaise (PEM), where exertion leads to a delayed crash. It’s unknown if creatine could potentially allow someone to “push through” activity limits more easily, only to trigger a worse PEM episode later. This requires careful consideration and ideally medical guidance.

Step 4: Synthesis and Evaluation

• Mental Fatigue: There is moderate scientific support for creatine improving cognitive function and potentially reducing mental fatigue, especially under conditions of high cognitive demand, stress, or sleep deprivation. The mechanism (brain energy support) is plausible.

• Post-COVID Fatigue: The use of creatine is highly speculative at this point. While mechanistically plausible due to potential energy metabolism links, there is a lack of direct clinical evidence. It’s based more on hypothesis and extrapolation from other areas than on proven efficacy for Long COVID specifically.

• Safety: Creatine monohydrate is generally considered safe for healthy individuals at recommended doses (typically 3-5 grams/day maintenance, sometimes preceded by a loading phase). Common side effects are mild (water retention, occasional GI upset). However, individuals with pre-existing kidney conditions should exercise caution. Crucially, anyone with Long COVID should consult their doctor before starting any new supplement, including creatine, due to the complexity of the condition and potential interactions or unforeseen effects.

Step 5: Extrapolations and Generalizations

• Other Conditions with Energy Deficits: The potential role of creatine could be hypothesized for other conditions involving compromised energy metabolism:

  • Traumatic Brain Injury (TBI): Research suggests creatine might have neuroprotective effects and aid recovery, potentially by supporting energy needs during the brain’s repair phase. Some positive results exist.

  • Neurodegenerative Diseases: Conditions like Parkinson’s, Huntington’s, and ALS involve mitochondrial dysfunction. Creatine has been studied, but results have been largely disappointing in altering disease progression, although some symptomatic benefits might occur in specific contexts. Research is ongoing.

  • Aging: Normal aging is associated with declines in muscle mass and potentially cognitive function, possibly linked to subtle changes in energy metabolism. Some research explores creatine for sarcopenia and cognitive support in the elderly, with mixed but sometimes promising results.

• General Principle: Supplementing key metabolic intermediates (like creatine for the ATP/PCr system) may be beneficial when:

  1. There is an increased demand for the energy system (e.g., intense exercise, high cognitive load, stress).

  2. There is an impaired endogenous supply or production (e.g., dietary restriction, certain genetic disorders, potentially disease states like Long COVID or mitochondrial issues).

  3. The supplement can effectively reach the target tissue and increase relevant substrate pools (creatine does this for muscle and, to a lesser extent, brain).

• Limitations: This principle is not universal. The body has complex regulatory mechanisms. Simply adding more substrate doesn’t always fix a problem, especially if the core issue is enzyme function, transport, or downstream processes. Oversimplification is a risk.

Conclusion & Recommendations

1. For Mental Fatigue: Creatine supplementation has a reasonable scientific basis, particularly if the fatigue occurs under stress, sleep deprivation, or during prolonged cognitive tasks. It’s worth considering, starting with a standard dose (3-5g/day), being patient (brain saturation takes longer), and monitoring for effects. It’s not a magic bullet but may help buffer against cognitive energy drains.

2. For Post-COVID Fatigue: Using creatine is experimental and lacks direct evidence. While mechanistically plausible for some potential aspects of Long COVID, it’s unproven.

   • Proceed with Caution: If considering it, discuss it thoroughly with a doctor familiar with your Long COVID case.

   • Start Low & Go Slow: Begin with a low dose (e.g., 1-2g/day) and monitor carefully for any effects, positive or negative, especially concerning PEM.

   • Manage Expectations: Do not expect it to be a cure. It might offer partial support if energy metabolism is a factor, but it won’t address all potential causes (inflammation, autoimmunity, autonomic dysfunction etc.).

   • Prioritize Foundational Care: Focus on established management strategies for Long COVID: pacing, rest, managing specific symptoms, gradual activity increase (if appropriate and guided), nutrition, sleep, and addressing mental health.

In summary, creatine is a well-researched supplement for physical performance and shows promise for cognitive support under stress. Its application to the complex, heterogeneous condition of Long COVID fatigue remains hypothetical and requires specific clinical investigation before it can be recommended based on evidence.

Health note: This is informational content, not medical advice. Supplements and health decisions are personal; check with a qualified clinician if it matters for your situation.

1. ADHD and Brain Energy Demands:

   • ADHD is fundamentally linked to differences in brain function, particularly in areas responsible for executive functions: attention regulation, impulse control, working memory, and planning. These functions are primarily managed by the prefrontal cortex (PFC).

   • Executive functions are incredibly energy-intensive. Maintaining focus, inhibiting impulses, and manipulating information in working memory requires constant, efficient neuronal firing and communication.

   • Hypothesis: One dimension of ADHD challenges could relate to suboptimal energy regulation or meeting the high energy demands of these executive function circuits, leading to quicker mental fatigue, difficulty sustaining focus, or inconsistent performance.

2. Creatine’s Role in Brain Energy:

   • Creatine is vital for the brain’s energy buffering system (the phosphocreatine system), just as it is for muscles. It helps rapidly regenerate ATP, the primary cellular energy currency.

   • Supplementing with creatine increases the pool of creatine and phosphocreatine within the brain (though perhaps less dramatically than in muscle). This enhances the brain’s capacity to quickly produce energy during periods of high demand.

   • Connection: If ADHD involves challenges in meeting the energy demands of the PFC and related networks, boosting the brain’s energy reserve with creatine could potentially help these circuits function more efficiently and sustainably.

3. Potential Positive Possibilities for ADHD:

   • Enhanced Attention and Reduced Mental Fatigue: By providing more readily available energy (via faster ATP regeneration), creatine might help individuals with ADHD sustain attention for longer periods, particularly during demanding cognitive tasks (like schoolwork or complex projects). It could potentially reduce the feeling of “brain drain” or mental fatigue that often accompanies sustained focus attempts.

   • Improved Working Memory: Working memory involves holding and manipulating information actively, a very energy-demanding process highly relevant to ADHD difficulties. Increased energy availability via creatine could potentially bolster working memory capacity and efficiency, making it easier to follow multi-step instructions or mentally organize thoughts.

   • Support for Executive Function Under Stress: Creatine has shown benefits for cognitive functions, especially under stressful conditions (like sleep deprivation). Many individuals with ADHD also experience sleep difficulties, which can worsen symptoms. Creatine might help buffer the cognitive system against these stressors, leading to more consistent daytime functioning.

   • Boosting Neurotransmitter Synthesis/Release: While indirect, neurotransmitter systems (especially dopamine and norepinephrine, key in ADHD) rely on cellular energy for synthesis, packaging, release, and reuptake. Ensuring optimal energy availability could potentially support more efficient functioning of these neurotransmitter pathways critical for attention, motivation, and impulse control.

   • General Neuroprotection/Cellular Health: Creatine has demonstrated some neuroprotective properties in various models, potentially by stabilizing mitochondria and buffering against metabolic stress. Promoting overall brain cell health and resilience could be beneficial in the context of neurodevelopmental conditions like ADHD.

4. Supporting Observations (Biological Plausibility):

   • Creatine Deficiency Syndromes: Rare genetic disorders where the body cannot synthesize or transport creatine properly lead to severe neurological problems, including intellectual disability, developmental delays, autistic features, and movement disorders. This clearly demonstrates that adequate brain creatine is absolutely essential for normal neurodevelopment and function. This provides a strong “proof of principle” that optimizing creatine levels could influence cognitive function.

   • Early Research Signals: While large-scale clinical trials are lacking, some small pilot studies or case reports examining creatine in children with ADHD have suggested potential improvements in attention or cognitive scores, providing early, tentative signals that warrant further investigation.

Synthesizing the Positive Potential:

Creatine could potentially act as a cognitive energy enhancer relevant to ADHD. By boosting the brain’s fundamental bioenergetic capacity, particularly in demanding frontal lobe circuits, it might help improve the consistency and endurance of executive functions. This could manifest as better-sustained attention, improved working memory, and reduced mental fatigue during cognitively demanding tasks. Rather than directly targeting neurotransmitters like typical ADHD medications, creatine’s potential lies in supporting the underlying energy infrastructure that enables these cognitive processes to run more smoothly and efficiently. It represents a potential complementary approach focused on optimizing brain energy metabolism.

Health note: This is informational content, not medical advice. Supplements and health decisions are personal; check with a qualified clinician if it matters for your situation.

Creatine for cognitive enhancement

Tl;DR I personally take 10g/day of creatine monohydrate. There is a definite increase in physical endurance for some activities (mostly climbing/bouldering). I also (n=1 study) feel less tired during the days when I have not slept as well and generally feel good…
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Creatine is a naturally occurring compound synthesized primarily in the liver and kidneys from amino acids. It plays a crucial role in cellular energy metabolism throughout the body, including the brain. Its primary function involves the phosphocreatine (PCr) system, which acts as a rapid reserve for regenerating adenosine triphosphate (ATP), the cell’s main energy currency.

The brain is an incredibly energy-intensive organ, consuming about 20% of the body’s total energy despite making up only about 2% of its mass. This high energy demand is necessary for maintaining neuronal function, synaptic transmission, and overall cognitive processes. Just like muscles during intense exercise, the brain experiences periods of high metabolic demand during challenging cognitive tasks. It’s hypothesized that increasing the brain’s creatine pool through supplementation could enhance this energy buffering capacity, potentially leading to improved cognitive function, especially under demanding conditions.

The Mechanism: Fueling Brain Activity

1. ATP Buffering: The core proposed mechanism is straightforward. Supplemental creatine increases the concentration of both free creatine and phosphocreatine within brain cells (Rae et al., 2003). During periods of intense neural activity, ATP is rapidly broken down to ADP (adenosine diphosphate). Phosphocreatine can quickly donate its phosphate group back to ADP, regenerating ATP and maintaining energy supply for a longer duration before fatigue sets in. This is particularly relevant for tasks requiring sustained mental effort.

2. Neuroprotection: Some research suggests potential neuroprotective roles for creatine. It may help stabilize mitochondrial membranes, reduce the production of reactive oxygen species (oxidative stress), and potentially modulate neurotransmitter systems (Andres et al., 2008). While promising, these mechanisms are less directly linked to immediate cognitive enhancement compared to the energy buffering role.

Evidence for Cognitive Enhancement: A Nuanced Picture

The scientific literature on creatine and cognition presents a nuanced picture. It’s not a universal “smart drug,” but evidence suggests benefits under specific circumstances:

1. Conditions of Increased Mental Demand/Stress: This is where creatine appears most promising. Studies involving sleep deprivation, hypoxia (low oxygen), or complex, fatiguing cognitive tasks have often shown benefits.

   • Sleep Deprivation: Creatine supplementation has been shown to mitigate some of the cognitive decline associated with sleep deprivation, particularly in tasks involving executive function, reaction time, and mood (McMorris et al., 2006; McMorris et al., 2007). The brain’s energy demands increase during sleep deprivation, making the enhanced ATP buffering capacity potentially very useful.

   • Mental Fatigue: Supplementation may help sustain performance on complex cognitive tasks over time, reducing the effects of mental fatigue (Watanabe et al., 2002).

2. Vegetarians and Vegans: Individuals consuming diets devoid of meat and fish have significantly lower baseline creatine levels, both in muscle and potentially in the brain. Consequently, they often show more pronounced cognitive benefits from supplementation, particularly in areas like memory and intelligence tests (Rae et al., 2003; Benton & Donohoe, 2011). This highlights that creatine’s effects can be influenced by baseline levels.

3. Aging: Cognitive function naturally declines with age, partly due to alterations in brain energy metabolism. Some studies suggest that creatine supplementation in older adults may improve performance on certain cognitive tasks, particularly memory and executive function (McMorris et al., 2007; Kado et al., – Although this study is more observational on dietary intake, it supports the link). This is an active area of research, as maintaining brain energy could be crucial for cognitive longevity.

4. Specific Cognitive Domains:

   • Memory: Results are mixed. Some studies report improvements, especially in working memory (the ability to hold and manipulate information) and short-term recall, particularly under stress or in populations with lower baseline levels (e.g., vegetarians, older adults). However, other studies find no significant effect (Rawson & Venezia, 2011).

   • Executive Function & Reasoning: Similar to memory, the evidence is inconsistent. Some studies show benefits, while others do not. The type of task and the population studied seem to matter significantly.

   • Intelligence/Processing Speed: There is less compelling evidence for creatine broadly enhancing fluid intelligence or baseline processing speed in healthy young adults who are not under specific stress.

Dosage, Type, and Safety

• Type: Creatine monohydrate is the most extensively researched, cost-effective, and recommended form. Other forms (ethyl ester, HCL, etc.) lack sufficient evidence to justify their often higher cost and haven’t consistently demonstrated superior absorption or efficacy for cognitive purposes.

• Dosage: The standard dosage protocol used in most cognitive studies mirrors that used for physical performance: typically 3-5 grams per day taken consistently. A loading phase (e.g., 20g/day for 5-7 days) can saturate stores faster but isn’t strictly necessary; consistent daily dosing will achieve saturation over 3-4 weeks. Brain creatine levels appear to rise more slowly and to a lesser extent than muscle levels, suggesting long-term, consistent supplementation is likely required for cognitive benefits.

• Safety: Creatine monohydrate is one of the most studied supplements and has an excellent safety profile in healthy individuals across various age groups when taken at recommended dosages (Kreider et al., 2017).

  • Kidney Function: Fears about kidney damage are largely unfounded in individuals with healthy kidneys; numerous studies have shown no adverse effects on renal function with long-term use.

  • Hair Loss: The link to hair loss stems primarily from one small study showing an increase in DHT (a hormone linked to male pattern baldness) in rugby players (van der Merwe et al., 2009). However, this study didn’t measure hair loss itself, and subsequent, larger studies haven’t consistently replicated the DHT finding or shown a direct causal link between creatine and increased hair loss (Antonio et al., 2021 – Review). More research is needed, but current evidence doesn’t strongly support this claim.

  • Other Effects: Mild gastrointestinal upset (bloating, stomach cramps) can occur, especially with higher doses or if taken without sufficient water. Weight gain (primarily due to water retention in muscles) is common but less of a concern when focusing solely on cognitive benefits.

Limitations and Conclusion

While the potential for creatine to enhance cognitive function is scientifically plausible and supported by evidence in specific contexts, it’s crucial to manage expectations.

• Context Matters: The benefits are most apparent under conditions of metabolic stress (sleep deprivation, mental fatigue) or in populations with lower baseline levels (vegetarians, older adults). Effects in healthy, rested young adults eating an omnivorous diet may be subtle or absent.

• Not a Nootropic Panacea: Creatine is unlikely to dramatically boost IQ or turn an average person into a genius. Its effects are more related to maintaining performance under duress and potentially supporting specific cognitive processes like working memory.

• Heterogeneity: Research findings vary due to differences in study design, populations, dosages, and the specific cognitive tests used.

In conclusion, creatine monohydrate stands as a safe, affordable, and well-researched supplement with plausible mechanisms for supporting brain energy metabolism. There is credible evidence suggesting it can offer cognitive benefits, particularly by mitigating deficits caused by stressors like sleep deprivation and mental fatigue, and potentially offering more significant advantages for vegetarians, vegans, and possibly older adults. While not a universal cognitive enhancer for everyone in all situations, its potential to support brain function under challenging conditions makes it a supplement worthy of consideration beyond the realm of athletic performance.

References :

• Andres, R. H., et al. (2008). Creatine and its potential therapeutic value for targeting cellular energy impairment in neurodegenerative disorders. Brain Pathology, 18(3), 405-426.

• Antonio, J., et al. (2021). Common questions and misconceptions about creatine supplementation: what does the scientific evidence really show? Journal of the International Society of Sports Nutrition, 18(1), 13.

• Avgerinos, K. I., et al. (2018). Effects of creatine supplementation on cognitive function of healthy individuals: A systematic review of randomized controlled trials. Experimental Gerontology, 108, 166-173. (Note: This is a key systematic review)

• Benton, D., & Donohoe, R. (2011). The influence of creatine supplementation on the cognitive functioning of vegetarians and omnivores. British Journal of Nutrition, 105(7), 1100-1105.

• Kreider, R. B., et al. (2017). International Society of Sports Nutrition position stand: safety and efficacy of creatine supplementation in exercise, sport, and medicine. Journal of the International Society of Sports Nutrition, 14(1), 18.

• McMorris, T., et al. (2006). Effect of creatine supplementation and sleep deprivation, with mild exercise, on cognitive and psychomotor performance, mood state, and plasma concentrations of catecholamines and cortisol. Psychopharmacology, 185(1), 93-103.

• McMorris, T., et al. (2007). Creatine supplementation and cognitive performance in elderly individuals. Neuropsychology, Development, and Cognition. Section B, Aging, Neuropsychology and Cognition, 14(5), 517-528.

• Rae, C., et al. (2003). Oral creatine monohydrate supplementation improves brain performance: a double-blind, placebo-controlled, cross-over trial. Proceedings of the Royal Society B: Biological Sciences, 270(1529), 2147-2150.

• Rawson, E. S., & Venezia, A. C. (2011). Creatine supplementation and cognitive function. Current Sports Medicine Reports, 10(2), 116. (Note: This provides a good summary of the mixed findings)

• van der Merwe, J., et al. (2009). Three weeks of creatine monohydrate supplementation affects dihydrotestosterone to testosterone ratio in college-aged rugby players. Clinical Journal of Sport Medicine, 19(5), 399-404.

• Watanabe, A., et al. (2002). Effects of creatine on mental fatigue and cerebral hemoglobin oxygenation. Neuroscience Research, 42(4), 279-285.