Creatine: How to Take the Most Studied Supplement

The whole protocol fits in one line: 3–5 g of creatine monohydrate every day, indefinitely, loading optional. It is the most heavily researched supplement in sports nutrition, with hundreds of randomised trials and an International Society of Sports Nutrition position stand behind it, and the honest summary of that evidence is a 5–15% larger gain in strength and training volume when it is paired with actual training. The expensive forms, the on-off cycles and the kidney warnings are the parts that do not survive contact with the data.

What creatine is#

Creatine is not a vitamin and not a synthetic invention. It is a nitrogen-containing acid your body makes from glycine, arginine and methionine at a rate of roughly one gram a day in the liver, kidneys and pancreas. A mixed diet supplies another one to two grams, because creatine accumulates in the skeletal muscle of animals — meat and fish are its only meaningful food sources.

About 95% of the body's creatine sits in skeletal muscle, the rest in brain, heart and testes. The number that matters is this: without supplements, muscle is only 60–80% full. That unused headroom is the entire reason a supplement does anything at all.

Source	Creatine	Note
Raw beef, 100 g	about 0.9 g	Cooking destroys part of it
Raw pork, 100 g	about 1.0 g	Similar to beef
Raw herring, 100 g	0.6–1.0 g	One of the richest foods
Raw salmon, 100 g	about 0.45 g	Well below herring
Chicken, 100 g	about 0.4 g	Modest contribution
Milk, one glass	about 0.05 g	Effectively nothing
Plant foods	trace amounts	Why vegans start out low
One supplement serving	3–5 g	Equals 400–600 g of raw meat

The practical reading: you cannot eat your way to a supplemental dose. Five grams means half a kilo of raw meat a day, and cooking removes some of it. It also explains why vegetarians start lower and respond more strongly.

The mechanism, without the biochemistry lecture#

Muscle runs on ATP and holds almost none of it — enough for one or two seconds of maximal effort. Everything after that is a question of how fast you can rebuild ATP from ADP, and the available systems differ enormously in speed.

The fastest is the phosphocreatine system. Some of the creatine in muscle is stored phosphorylated, and the enzyme creatine kinase hands that phosphate straight to ADP. No oxygen, no intermediate steps, one reaction. The price of that speed is capacity: phosphocreatine covers another 6–10 seconds of all-out work before glycolysis, which is far slower, takes over.

Supplementing raises total muscle creatine by 20–40%, and with it the phosphocreatine reserve. What that buys you:

• A bigger reserve for the opening seconds of an effort, so the last reps of a set are slightly stronger.
• Faster phosphocreatine resynthesis between sets, so a 60–120 second rest restores more.
• Some hydrogen ion buffering, which nudges back the point where a set falls apart.

Note what is absent: creatine is not a stimulant and supplies no energy of its own. It widens a buffer that lets you do a bit more work per session, and the muscle and strength come from months of that extra work accumulating.

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Why monohydrate is still the standard#

Creatine monohydrate is a creatine molecule with one water molecule attached. It is what nearly every study of the last thirty years used, it costs almost nothing, and its bioavailability is close to 100%.

The supplement industry keeps releasing upgrades, and the sales pitch never changes: monohydrate supposedly dissolves poorly, degrades to creatinine in the stomach, and therefore needs oversized doses. None of that holds up — monohydrate is essentially stable during gastric transit, and its absorption has been measured directly and found near complete.

Head-to-head trials of the premium forms keep landing on the same result: equivalent, never better. The cleanest example is a 28-day comparison of buffered creatine (Kre-Alkalyn) against monohydrate in resistance-trained men, which found no difference in muscle creatine measured by biopsy, in body composition or in strength.

Form	The claim	The evidence	Cost per gram
Monohydrate	None in particular	The standard: ~100% absorption, hundreds of RCTs	Lowest
Micronised monohydrate	Mixes better	Same molecule, finer grind, sometimes easier on the gut	Slightly higher
Hydrochloride (HCl)	More soluble, needs less	Solubility is higher; outcome advantage never shown	3–5x higher
Buffered (Kre-Alkalyn)	Survives stomach acid	Head-to-head: identical to monohydrate on every measure	3–4x higher
Ethyl ester	Better cell uptake	Worse: degrades to creatinine faster, lower muscle saturation	Higher
Malate, citrate, nitrate	The salt adds something	Comparable, but less creatine per gram of powder	Higher
Liquid creatine	Convenient, pre-dissolved	Creatine degrades to creatinine in solution over time	Higher

The conclusion is blunt: anything other than monohydrate is a marketing premium. The only upgrade worth considering is micronised monohydrate if the regular powder upsets your stomach, and even that is a small difference.

Loading versus starting small#

There are exactly two workable protocols, and the only difference is how fast muscle fills.

With loading. 0.3 g per kg of body weight per day for 5–7 days, split into four doses — roughly 24 g a day in four servings for an 80 kg person — then 3–5 g a day. Muscle is saturated within a week.

Without loading. Start at 3–5 g a day and stay there; muscle reaches the same plateau in about 28 days. It is also gentler, since gastrointestinal discomfort is creatine's only common side effect, it is dose-dependent, and it essentially disappears without loading.

	With loading	Without loading
Dose	20–25 g/day in 4 servings for 5–7 days	3–5 g/day from the start
Time to muscle saturation	5–7 days	About 28 days
Final muscle creatine level	Plateau	Same plateau
Weight change in week one	1–2 kg of water, obvious	Gradual, barely noticeable
Risk of GI upset	Higher at 5 g+ per serving	Minimal
Powder used	More in the first week	More economical
Who it suits	A competition or camp 1–2 weeks away	Everyone else

Loading earns its place in one scenario: you need the effect within a fortnight, before a competition or a training camp. Otherwise, saving three weeks is not worth the stomach or the extra powder.

Timing and what to take it with#

The hour of the day barely matters; consistency does. Some studies hint at a small edge for post-workout dosing, but that gap is trivial next to the gap between taking it and not.

What does help slightly is taking it with carbohydrate or a mixed meal, since insulin increases CreaT1 activity and improves uptake. Caffeine is not a problem — the old interference worry rests on a single study and has not replicated. Rest days count too: the goal is a permanently saturated muscle, not a pre-workout top-up.

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What it actually does, at honest magnitude#

Creatine is simultaneously the best-evidenced supplement on the market and a victim of inflated expectations, so precision matters here.

Strength and power. The most reliable finding. Combined with resistance training, creatine adds roughly 5–15% to strength gains compared with training on placebo. That is 5–15% more progress than you would have made anyway — not 15 kg on your bench.

Repeated short efforts. Sprints, intervals, combat sports, stop-start team sports: this is where the phosphocreatine system is the limiting factor and where the effect is largest. Prolonged aerobic endurance is not improved, and the small weight gain is arguably a nuisance for distance runners.

Lean mass. Real but modest. A meta-analysis of randomised trials found roughly a kilogram more lean body mass than placebo, with the effect varying by age, sex and exercise type and largest alongside resistance training. Some of the early gain is intracellular water; the rest accrues later from the extra training volume.

Recovery. There is evidence of less muscle damage, faster strength recovery after hard sessions and better glycogen replenishment alongside carbohydrate — genuine, but less firmly established than the strength data.

What creatine does not do: burn fat, replace protein and calories, work without training, or produce anything quickly. And roughly 20–30% of people are non-responders whose muscles are already close to full, typically heavy meat and fish eaters.

The water question#

The most common complaint about creatine is bloating, and it rests on a real mechanism described inaccurately.

Creatine is osmotically active, so as its concentration rises inside the muscle cell, water follows it in. That is intracellular retention, a different thing from the subcutaneous kind responsible for a puffy look. Intracellular water makes muscle look fuller, and cell swelling is itself thought to be one of the signals that stimulates protein synthesis.

Expect about 1–2 kg in the first week, obvious on the scale with loading and almost invisible without it. After that, weight changes reflect tissue rather than fluid, and body composition studies find no increase in extracellular fluid. Two consequences: do not mistake that first-week jump for fat gain, and if you compete in a weight class, do not start creatine right before a weigh-in.

Kidneys: where the myth comes from#

The kidney fear rests on one true observation that means something other than what it appears to.

Creatine degrades non-enzymatically to creatinine, which is cleared by the kidneys and serves as the standard marker for estimating glomerular filtration rate. Supplement creatine and you supply more substrate, so more creatinine is produced and blood levels rise. The eGFR equation cannot tell the difference and reports "reduced kidney function". A raised creatinine in a creatine user therefore reflects intake, not damage to the filter — and it is easy to check, because markers independent of muscle metabolism such as cystatin C, urinary albumin and measured clearance stay normal.

Controlled trials and follow-up of up to five years in healthy people, including athletes on high doses, have not found deterioration in kidney function. The ISSN position stand puts it plainly: there is no scientific evidence that short- or long-term use at recommended doses harms the kidneys, liver or any other organ in healthy individuals.

All of this describes healthy kidneys. With existing kidney disease the evidence base is thin, and self-prescribing is not justified.

The brain: sleep loss and vegetarians#

Brain tissue uses the phosphocreatine system too, and this is currently the most interesting line of research — with the honest caveat that the evidence here is much weaker than for muscle.

Sleep deprivation. In a widely discussed crossover study, participants kept awake overnight took a single high dose of creatine, and it partly offset the decline in cognitive performance while shifting cerebral high-energy phosphates measured by MR spectroscopy. The trial was small, the dose far above normal, and independent replication is pending. But the logic is sound: sleep loss stresses brain energy metabolism, and a larger phosphate buffer is a plausible cushion.

Vegetarians and vegans. Slightly firmer ground. People who eat no meat or fish take in almost no dietary creatine and start with lower stores. A systematic review comparing vegetarians with omnivores found vegetarians gain more muscle creatine and lean mass from supplementation, simply because they begin further from the ceiling. Individual trials have reported better working memory and processing speed in vegetarians where omnivores showed nothing.

Everyone else. In a well-rested omnivore, do not expect cognitive effects: reviews in healthy adults find small and inconsistent memory improvements at best. Creatine may help the brain when the system is under strain — sleep loss, stress, low baseline stores, older age — but as an everyday nootropic it has not earned the claim.

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Cycling, women and older adults#

Do you need breaks?#

No. Cycling was imported from steroid logic, where breaks let a suppressed hormonal axis recover. Creatine has no such axis: endogenous synthesis dips slightly during use and returns to normal after stopping, and no tolerance develops. What a break achieves is a return to baseline muscle creatine over four to six weeks, followed by another month of refilling. The only good reason to stop is deciding you no longer want it.

Women#

There is no separate female protocol; the dose is the same 3–5 g. The differences lie elsewhere. Women start with muscle creatine stores around 70–80% of male levels and usually eat less of it. The meta-analysis that examined age and sex found lean mass gains smaller in women than in men, while strength gains are broadly comparable. The fear of "bulking up" is misplaced: a kilogram of intracellular water changes neither your waist nor your face, and muscle gain in women is slow and driven by training and food, not by powder.

Older adults#

Muscle mass, strength and creatine stores all decline with age. In people over 50–60, creatine combined with resistance training produces greater gains in lean mass and strength than training alone — and the combination is the point, since the effect without training is minimal.

The protocol is unchanged: 3–5 g of monohydrate daily, resistance training two or three times a week, adequate protein. Given the cost and safety profile, it is one of the few supplements worth raising with a doctor in the context of sarcopenia prevention. The kidney caveat carries extra weight here, because filtration declines with age regardless of supplements, so the decision should follow measured kidney function.

The practical summary#

1. Form: monohydrate. Everything else costs more for no demonstrated gain.
2. Dose: 3–5 g daily, without skipping rest days.
3. Loading: optional, and only if you are short on time — 20 g a day in four servings for 5–7 days.
4. Timing: whenever, though food or carbohydrate improves uptake slightly.
5. No cycling. Breaks only undo what you have accumulated.
6. The 1–2 kg early gain is intracellular water, not fat and not swelling.
7. Mention creatine before blood work: creatinine will read high without any pathology.
8. Kidney disease, pregnancy, breastfeeding or nephrotoxic drugs: ask a doctor first.

Creatine is the rare supplement that deserves its reputation — cheap, better studied than anything else on the shelf, mechanistically clear, and reliably modest. The problem has never been the molecule. It is the two distortions around it: marketing that sells expensive forms and impossible promises, and folklore that warns about kidneys when it is really describing a quirk of a lab test.