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Supplement · amino_acid

Creatine

Quick read: Creatine is a nitrogenous organic acid, a guanidinoacetic acid derivative, naturally synthesized in the human body from amino acids (arginine, glycine, methionine) primarily in the liver and kidneys.

Quick facts · Buffered Creatine (Kre-Alkalyn)

Dose
1.5 g
Per day
3 g
Timing
Twice a day
Course
90 days + break 30 days
Strongest effect
Workout Efficiency EnhancementVery highTheoretical
Scientific background
Creatine is a nitrogenous organic acid, a guanidinoacetic acid derivative, naturally synthesized in the human body from amino acids (arginine, glycine, methionine) primarily in the liver and kidneys. It is also obtained exogenously from meat and fish. Its primary physiological role involves rapid energy metabolism, especially in tissues with high and fluctuating energy demands like skeletal muscle and the brain. Creatine is phosphorylated to phosphocreatine (PCr) by creatine kinase. PCr serves as a high-energy phosphate reservoir, rapidly regenerating adenosine triphosphate (ATP) from adenosine diphosphate (ADP) during intense, short-burst activities. This phosphocreatine system is crucial for maintaining cellular energy homeostasis and rapidly resupplying ATP for muscle contraction and neural activity. Supplementation with creatine monohydrate is extensively researched and widely adopted as an ergogenic aid, enhancing exercise performance by increasing muscle PCr stores. This leads to improved strength, power output, and resistance to fatigue during high-intensity, intermittent exercise. Beyond athletic performance, ongoing research explores creatine's therapeutic potential in neurodegenerative diseases, sarcopenia, and conditions associated with energy deficit, leveraging its neuroprotective and metabolic support properties. Its safety and efficacy profile in healthy individuals are well-established.

Form & dosage

Single dose
1.5 g
Daily
3 g
Course
90 days
Break
30 days
Timing
Twice a day
How we rate evidence

Probability — how likely the effect is to show up

  • Very high
  • High
  • Medium
  • Low

Evidence — where the data comes from

  • Scientific Meta-analyses and randomized trials
  • Clinical Clinical trials and practice
  • Animal research Animal studies
  • People reports User reports and anecdotes
  • Theoretical Mechanistic reasoning, not yet tested

Effects

Very high probability(4)

  • Workout Efficiency Enhancementbodytheoretical

    Through its pivotal role in energy production and muscle recovery, creatine significantly boosts overall training performance. Users typically experience more productive workouts, leading to faster progress in strength, power, and muscle development.

  • Cellular Energy Supporthealththeoretical

    Creatine is a critical component of the phosphocreatine energy system, facilitating the rapid regeneration of ATP (adenosine triphosphate) – the primary energy currency of cells. This fundamental biological mechanism is the basis for most of its performance-enhancing effects.

  • Physical Strength Increasebodytheoretical

    Creatine saturates muscle cells with phosphocreatine, rapidly regenerating ATP during intense exercise. This allows you to lift heavier weights and perform more reps, leading to significant strength gains over time.

  • Muscle Mass Increasebodytheoretical

    By increasing strength and workout volume, creatine directly stimulates muscle protein synthesis and cell volumization, pulling water into muscle cells. This combined effect consistently promotes noticeable gains in lean muscle mass for most individuals.

High probability(4)

  • Muscle Recovery Accelerationbodytheoretical

    Creatine aids in reducing muscle cell damage and inflammation post-exercise, accelerating the regeneration of muscle fibers. This helps to lessen delayed onset muscle soreness (DOMS) and allows for quicker return to intense training.

  • Fatigue Reductionpsychetheoretical

    By optimizing energy pathways in both muscles and brain, creatine effectively reduces feelings of physical and mental fatigue, particularly during strenuous activity or periods of sleep deprivation. This translates to sustained energy levels and alertness.

  • Physical Endurance Increasebodytheoretical

    Creatine enhances the body's capacity for high-intensity, short-burst activities by providing rapid energy replenishment. This allows you to perform more repetitions, sets, or sprints before fatigue sets in, improving anaerobic endurance.

  • Hydration Supportbodytheoretical

    Creatine is an osmotically active substance, meaning it draws water into muscle cells, leading to increased intracellular hydration and muscle volumization. This supports cell function and contributes to the feeling of fuller muscles.

Medium probability(3)

  • Memory Improvementmindclinical

    By enhancing brain energy reserves, particularly in individuals with lower baseline creatine levels (e.g., vegetarians), creatine can subtly improve working memory and cognitive processing speed. While effects can be mild for some, others report clearer thinking and better recall.

  • Neuroprotective Effecthealthclinical

    Beyond muscle, creatine acts as an energy buffer in the brain, supporting neuronal energy metabolism. While not as universally perceived as its physical benefits, it contributes to protecting brain cells from stress and improving overall neurological health.

  • Increase Mental Endurancemindclinical

    Creatine supports sustained ATP production in the brain, helping to reduce mental fatigue during prolonged cognitive tasks. Users may find it easier to maintain focus and productivity through mentally demanding periods.

Side effects

High probability(2)

  • Fluid Retention (Edema)bodytheoretical

    Creatine draws water into your muscle cells, which can lead to a noticeable increase in intracellular fluid, sometimes perceived as a slight puffiness or 'water weight' gain, especially during the initial loading phase.

  • Weight Gain (Undesirable)healththeoretical

    An initial increase in body weight is a very common and expected effect of creatine supplementation, primarily due to the increased water content within your muscles as they become saturated with creatine.

Medium probability(1)

  • Taste Disorders (Dysgeusia)healthpeople_reports

    Creatine Ethyl Ester (CEE) is notoriously associated with a strong, unpleasant, often metallic or bitter taste that can linger in the mouth, making it difficult for some users to consume regularly.

Low probability(3)

  • Abdominal Bloatinghealthclinical

    Creatine monohydrate can draw water into your intestines or not dissolve completely, leading to a feeling of fullness and abdominal distension, especially during the loading phase or with higher doses.

  • Increased Thirst and Urinationhealthpeople_reports

    As creatine pulls water into your muscle cells, your body might signal increased thirst to maintain overall hydration, potentially leading to more frequent urination as you increase your fluid intake.

  • Digestive Discomforthealthpeople_reports

    A general feeling of unease in the stomach, including mild cramps or a heavy sensation, can arise, particularly when beginning creatine monohydrate supplementation or consuming it without adequate hydration.

Low probability(9)

  • Headachehealthpeople_reports

    Some users report headaches, particularly during the initial phase of creatine use. This is often attributed to insufficient water intake, as creatine pulls water into muscle cells, potentially leading to mild dehydration if fluid consumption isn't increased.

  • Vomitinghealthpeople_reports

    In rare cases, especially with very high single doses of creatine monohydrate or when taken on an empty stomach, significant gastric irritation can lead to vomiting.

  • Gastritis (Stomach Irritation)healthpeople_reports

    Taking creatine, particularly larger doses of monohydrate, on an empty stomach can irritate the stomach lining, potentially leading to symptoms similar to mild gastritis, such as a burning sensation or discomfort.

  • Hair Loss (Alopecia)bodypeople_reports

    Some individuals anecdotally report increased hair shedding when taking creatine, often linked to theoretical changes in DHT levels. However, scientific evidence supporting this is limited and inconsistent, and it's not a widely confirmed effect for most users.

  • Diarrheahealthclinical

    Over-dosing or taking creatine on an empty stomach, particularly the monohydrate form, can sometimes lead to loose stools or increased bowel movements as your digestive system reacts to the unabsorbed compound.

  • Nauseahealthpeople_reports

    Some individuals may experience mild nausea, especially when taking larger doses or creatine monohydrate without sufficient water or food, as the supplement can irritate the stomach lining.

  • Gout Flare-uphealthclinical

    Creatine metabolism involves purines, which can increase uric acid levels. While generally safe for healthy individuals, those with a pre-existing predisposition to gout might experience a rare flare-up.

  • Muscle Crampsbodypeople_reports

    While often anecdotally associated with creatine, muscle cramps are rarely a direct side effect. They can occur if you don't drink enough water or if there's an electrolyte imbalance, as creatine influences fluid distribution in the body.

  • Acnebodypeople_reports

    While not a direct or common side effect, some users have reported an increase in acne, possibly due to individual sensitivity or theoretical minor hormonal fluctuations, though scientific backing for this link is weak.

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