Creatine Monohydrate
The most researched sports supplement in existence
What is Creatine Monohydrate?
Creatine is a naturally occurring compound synthesised in the liver, kidneys, and pancreas from the amino acids arginine, glycine, and methionine. It's stored predominantly in skeletal muscle (about 95%) as phosphocreatine (PCr). The human body produces roughly 1–2g/day, and a typical omnivorous diet provides another 1–2g/day. Supplementation saturates muscle creatine stores 3–5× beyond what diet and endogenous synthesis can achieve.
How it works
During high-intensity exercise lasting 1–10 seconds, ATP is the primary energy currency. Phosphocreatine rapidly donates its phosphate group to ADP to regenerate ATP via the creatine kinase reaction — this is the phosphagen energy system. By saturating phosphocreatine stores, creatine supplementation extends the duration of maximal-power output before fatigue occurs. Additionally, creatine appears to increase satellite cell activity (promoting muscle repair) and has independent effects on brain energy metabolism.
What the evidence shows
Creatine is one of the most studied supplements in existence, with over 500 peer-reviewed studies and a long safety record. Meta-analyses consistently show: 5–15% improvements in maximal strength, 1–5% improvements in lean mass over training programmes, significant improvements in high-intensity, short-duration exercise performance. A 2021 meta-analysis found cognitive benefits too — improved short-term memory and reasoning, particularly under sleep deprivation or stress.
When to expect results
Muscle water content increases as creatine is stored. Scale weight may rise 0.5–2kg — this is intramuscular water, not fat.
Creatine stores approaching saturation. Performance improvements beginning — extra rep or two at your top sets.
Full saturation achieved. Noticeable improvements in strength and high-intensity endurance.
Accumulated muscle and strength gains from sustained training intensification. Cognitive benefits (memory, focus under fatigue) also emerging.
Dosing
No loading necessary for most people. 3–5g creatine monohydrate daily saturates muscle stores in 3–4 weeks. Loading protocol (20g/day for 5–7 days, then 3–5g maintenance) saturates faster but causes more GI discomfort and water retention and confers no long-term advantage. Take it consistently — timing relative to workouts matters less than daily consistency.
Forms to choose
Creatine monohydrate is the gold standard — extensively researched, most affordable, most effective. Don't waste money on creatine HCl, ethyl ester, or 'Kre-Alkalyn' — no credible evidence they outperform monohydrate, and they cost 5–10× more. Micronised creatine monohydrate dissolves more easily but is otherwise identical.
Who benefits most
Anyone engaged in strength training, HIIT, team sports, or any activity with sprint/power demands. Also benefits older adults (counteracts age-related muscle loss), vegetarians/vegans (who get minimal dietary creatine), and people seeking cognitive support under stress.
Who should avoid / caution
People with pre-existing kidney disease should consult a GP before supplementing, not because creatine causes kidney problems, but out of caution in already-impaired kidney function. People prone to kidney stones may want to monitor.
Interactions & stacking
Creatine and protein have additive effects on muscle protein synthesis and training adaptation. Take together post-workout.
Creatine powers 1–10 second efforts; beta-alanine buffers 1–4 minute efforts. Together they cover the full power-endurance spectrum.
Some older research suggested antagonism — not supported by modern studies. Most people can take both without issue.
Insulin release from carbohydrates enhances creatine uptake into muscle. Taking with a carb-containing meal or shake may improve saturation speed.
Safety & side effects
Creatine monohydrate is one of the safest supplements ever studied. Commonly reported 'side effects' such as kidney damage, cramps, and dehydration have been thoroughly investigated and not supported by evidence in healthy people. Some people experience mild GI discomfort at higher doses — take with food if this occurs. Water weight gain of 0.5–2kg in the first 2 weeks is normal and reflects intramuscular water storage.
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This information is for educational purposes only and does not constitute medical advice. Always consult your GP or a qualified healthcare professional before starting any new supplement, particularly if you are pregnant, breastfeeding, have a medical condition, or are taking prescription medication.