Walk into any gym and ask ten people about creatine. You'll hear that it causes kidney damage. That you need to load it. That it's only for bodybuilders. That it makes you retain water. That you should cycle it. Almost all of it is wrong.
Creatine monohydrate is the single most studied ergogenic supplement in sports science. The evidence base is enormous, the safety record is exceptional, and the benefits extend well beyond the gym. If you're not taking it, you're almost certainly leaving performance on the table — whether that's physical or cognitive.
What creatine actually does
Creatine is a naturally occurring compound made in the liver, kidneys, and pancreas from the amino acids arginine, glycine, and methionine. Your body also gets creatine from meat and fish — about 1-2g per day in a typical omnivore diet.
Around 95% of your body's creatine is stored in skeletal muscle as phosphocreatine. This phosphocreatine acts as a rapid energy reserve for your cells. When you do anything explosive — sprint, lift a heavy weight, jump — your muscles need ATP (adenosine triphosphate) faster than aerobic metabolism can produce it. Phosphocreatine donates a phosphate group to ADP to rapidly regenerate ATP, giving you more energy for high-intensity efforts.
In practical terms: more creatine in your muscles means more fuel available for explosive, high-intensity work. You can lift heavier, do more reps, sprint faster, and recover between sets more quickly.
What makes creatine genuinely remarkable is that this isn't just acute performance enhancement. Higher muscle creatine levels over time mean greater training stimulus, which leads to more muscle growth, more strength, and better long-term adaptation.
What the research actually shows
The evidence for creatine monohydrate is about as strong as it gets in sports nutrition:
Strength and power. A meta-analysis of 22 studies found that creatine supplementation increased maximum strength by an average of 8% and explosive power by 14% compared to placebo. These are meaningful, consistent effects across different populations and training protocols.
Muscle hypertrophy. Creatine doesn't directly build muscle, but it allows you to train harder and recover faster — which leads to more muscle over time. Studies consistently show greater lean mass gains in creatine users compared to non-users following identical training programmes.
High-intensity endurance. Creatine benefits any sport requiring repeated bursts of high-intensity effort — football, basketball, tennis, combat sports, CrossFit. It's less relevant for pure steady-state endurance like marathon running, where the ATP-PC energy system is less dominant.
Cognitive function. This is the underreported benefit. A 2003 study by Rae et al. found that creatine supplementation significantly improved working memory and intelligence test scores in vegetarians. More recent research has extended this to sleep-deprived individuals and older adults. The brain uses phosphocreatine for energy too — particularly during demanding cognitive tasks.
Older adults. Creatine is increasingly recognised as important for healthy ageing. It helps preserve muscle mass and strength during ageing, reduces fatigue, and may protect against neurodegenerative conditions. Several geriatric medicine experts now recommend it routinely for adults over 60.
Creatine is not just a gym supplement. The evidence for cognitive benefits, healthy ageing, and recovery is substantial. Almost everyone — not just athletes — can benefit from it.
Do you need to load creatine?
This is one of the most persistent myths in supplement culture. The idea behind loading is that you take a large dose (20-25g per day) for 5-7 days to saturate your muscles quickly, then drop to a maintenance dose of 3-5g per day.
Loading works — it does saturate your muscles faster, typically within a week versus 3-4 weeks with a standard dose. But here's what the supplement industry doesn't emphasise: the end result is identical. After 4 weeks, muscle creatine levels are the same whether you loaded or not.
The downsides of loading are real: gastrointestinal discomfort, bloating, and the hassle of managing large doses. For most people, simply taking 3-5g daily from day one and waiting a month to fully saturate is the better approach.
The only reason to load is if you have a specific event coming up within 2 weeks and want to be saturated by then. Otherwise, skip it.
How much creatine should you take?
The research consistently points to 3-5g of creatine monohydrate per day as the effective maintenance dose for most people. Larger individuals (over 90kg) may benefit from the higher end of that range.
Some newer research suggests that higher doses (0.1g per kg of bodyweight) may be more effective for cognitive benefits and for older adults, but 5g daily covers most people's needs well.
What matters more than the exact dose is consistency. Creatine works by saturating your muscles over time — missing days means incomplete saturation and reduced benefits. Daily supplementation, every day, is the key.
When should you take creatine?
The honest answer: it doesn't matter much. The acute timing of creatine is far less important than with other supplements like caffeine or protein. What matters is that you take it consistently every day.
That said, post-workout may have a slight edge. A 2013 study found modestly greater muscle and strength gains when creatine was taken immediately after training compared to before. The effect was small, but if you want to optimise, post-workout with a meal is a reasonable default.
Taking creatine with carbohydrates or protein may slightly enhance uptake due to insulin-mediated transport into muscle cells. A post-workout shake or meal covers this naturally.
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Get my personalised stack →The myths — debunked
"Creatine damages your kidneys." This is the most persistent and most wrong myth about creatine. It originates from a single case report from 1998 involving a person with pre-existing kidney disease. Decades of subsequent research in healthy individuals have found zero evidence of kidney harm at standard doses. A 2019 review of long-term creatine use (up to 5 years) found no adverse effects on kidney function markers.
"You need to cycle creatine." There is no scientific basis for this. Creatine cycling — taking it for 8 weeks then stopping for 4 — came from bro-science, not research. Long-term continuous use has been studied and found safe. Stopping supplementation simply allows your muscle creatine levels to gradually return to baseline over 4-6 weeks, losing the performance benefits you built up.
"Creatine causes hair loss." This comes from a single study showing increased DHT (a hormone linked to hair loss) in rugby players taking creatine. The study has never been replicated, DHT levels returned to normal when supplementation stopped, and no study has actually shown creatine causes hair loss. If you have male-pattern baldness in your family, the risk from creatine is theoretical at best.
"Creatine makes you fat or bloated." Creatine causes water retention — inside muscle cells, not under the skin. This intracellular water is part of what makes muscles look fuller and perform better. The scale may go up 1-2kg in the first few weeks, but this is not fat gain. Body fat is unaffected by creatine.
Which form of creatine should you buy?
| Form | Evidence | Verdict |
|---|---|---|
| Creatine Monohydrate | 700+ studies, gold standard | ✅ Best choice — always |
| Creatine HCL | Limited, mostly manufacturer-funded | ⚠️ More expensive, no proven advantage |
| Creatine Ethyl Ester | Shown to be inferior in head-to-head tests | ❌ Avoid |
| Buffered Creatine (Kre-Alkalyn) | No advantage over monohydrate in RCTs | ❌ Marketing gimmick |
| Creatine Nitrate | Very limited evidence | ⚠️ Insufficient data |
Every "advanced" form of creatine is more expensive and supported by weaker evidence than plain monohydrate. The supplement industry creates these variations to charge more money. Stick with monohydrate.
For monohydrate specifically, look for Creapure — a German-manufactured creatine monohydrate that is third-party tested for purity and has the most consistent research record. Many reputable brands use Creapure as their source.
Who should take creatine?
Athletes and people who train regularly. If you lift weights, do CrossFit, play team sports, or do any form of high-intensity exercise, creatine will improve your performance and recovery. This is about as close to certain as supplements get.
Vegetarians and vegans. Because creatine is found almost exclusively in meat and fish, vegetarians and vegans have significantly lower baseline muscle creatine levels. They respond to supplementation more dramatically than omnivores and arguably have the most to gain.
Older adults. Sarcopenia — the age-related loss of muscle mass — is one of the most important health challenges of ageing. Creatine combined with resistance training is one of the most evidence-backed interventions for preserving muscle and strength as you age.
People doing cognitively demanding work. Sleep deprivation, stress, and demanding mental work all deplete brain phosphocreatine stores. Supplementation helps maintain cognitive performance under these conditions. If you're pulling long hours or dealing with significant mental load, creatine is worth considering.
Who should be cautious?
People with pre-existing kidney disease should consult a doctor before taking creatine, as impaired kidneys may handle the increased creatinine load differently. For healthy individuals, the evidence strongly supports safety — but if you have a kidney condition, get medical advice first.
Creatine is generally not recommended for children under 18, not because of proven harm but because of limited research in this population.
Practical recommendations
What to buy: Creatine monohydrate, ideally Creapure. Unflavoured powder is the cheapest and most versatile form. Capsules are convenient but cost more per gram. Avoid anything marketed as "advanced", "buffered", or with a proprietary blend.
How much: 3g if you're under 70kg, 5g if you're over 70kg. Take it daily, every day, without breaks.
When: Post-workout with a meal or shake is marginally optimal, but any time of day is fine. Consistency matters infinitely more than timing.
What to expect: Within 2-4 weeks of daily supplementation you'll notice you can push slightly harder in training. Full saturation takes about a month. The benefits are cumulative — the longer you take it, the more you train with it, the greater the adaptation.
Interactions to know: Creatine is generally very well tolerated alongside other supplements. Caffeine was historically thought to blunt creatine's effects, but this has not been confirmed in more recent research. Taking creatine with carbohydrates slightly increases muscle uptake via insulin. No significant negative interactions with common supplements have been established.