Creatine: What the Research Says
Creatine monohydrate is the most studied sports supplement there is. What it does, the doses studies used, and which of the common worries hold up.
Most advertised supplements rest on a small study or two. Creatine has been studied for decades across hundreds of trials, and the results are unusually consistent.
What creatine is
Creatine is a compound your body makes and stores, mostly in your muscles, and you also get some from meat and fish. Your muscles use it to power short, hard efforts.
Your muscles run on a molecule called ATP. During an explosive effort (a heavy set, a sprint, a jump) you use up the ATP on hand within seconds. Muscle stores creatine as phosphocreatine, which regenerates ATP quickly, like a small rechargeable battery. Supplementing tops up that store, so you have a little more available for brief, high-effort bursts.
What the research says it does
Creatine gives you real but modest benefits. Large reviews agree on the main findings [1]:
- Strength and power: small, reliable improvements, especially in short, intense efforts. A meta-analysis of about a hundred placebo-controlled studies found the clearest effects on repeated efforts of 30 seconds or less [2].
- Training volume: you can often get an extra rep or two across sessions, and over months that added volume adds up to more progress.
- Lean mass: a small increase [2], partly because creatine draws a little more water into your muscle cells, and partly from the extra training you can do [3].
Some of the early gain on the scale is water inside the muscle rather than new tissue. That's normal and harmless. The lasting benefit is that creatine lets you train slightly harder, and harder training builds muscle over time.
It works on top of good training
If your program, protein intake, and consistency aren't in place, a scoop of creatine won't make up the gap.
How it's taken in studies
- Dose: about 3–5 g of creatine monohydrate per day, every day [3].
- Loading is optional. A loading phase (around 20 g a day, split into four doses, for five to seven days) saturates your muscles faster. A daily 3–5 g reaches the same level within about a month. In the classic dosing study, 20 g a day raised muscle creatine by about 20% in six days, and 3 g a day reached the same rise over 28 days [4].
- Timing makes little difference. Before training, after, or with breakfast: pick whatever you'll remember. The benefit comes from keeping your muscles saturated over time [4], so the timing of any one dose matters little.
- Take it daily. Missing the odd day matters far less than stopping after a couple of weeks.
Anchor it to a habit
Attach the dose to something you already do every day: your morning coffee, your protein shake, or a glass of water with a meal. Plain monohydrate is nearly tasteless and mixes fine.
Safety and the common myths
For healthy people, creatine has one of the strongest safety records of any supplement. The evidence on each of the common worries:
- "It damages your kidneys." In healthy people, the research doesn't support this [1] [3]. Creatine can slightly raise creatinine, a marker labs use to estimate kidney function, without any sign of harm to the kidney. If you have existing kidney disease, check with a doctor first.
- "It causes hair loss." This claim traces back to one small study of 20 rugby players that measured a hormone (DHT), not hair loss [5], and it hasn't been reproduced [3]. The evidence is limited in both directions, but nothing supports the confident "creatine causes balding" claim you'll see online.
- "It's a steroid." Creatine is a naturally occurring compound in your energy system, and it doesn't act on hormones the way anabolic steroids do [3].
- "It makes you bloated." The extra water it draws in sits mostly inside the muscle cell, and studies don't find the puffy, subcutaneous water retention people describe [3]. Some people see a small, quick rise on the scale early on; that's the water inside the muscle.
When to check with a doctor first
If you have kidney disease or any chronic medical condition, or if you're pregnant or nursing, talk to your doctor before starting creatine or any other supplement. General guidance can't account for your medical situation.
Who benefits, and which form to buy
If you train with any intensity (lifting, sprinting, sports with repeated hard efforts), creatine is one of the few supplements with the evidence to justify the cost. If you mostly do easy steady-state cardio, the benefit is smaller and less certain.
On form: buy plain creatine monohydrate. Pricier versions such as creatine HCl and buffered creatine are marketed as superior, but they haven't outperformed monohydrate in the research [3] [6]. Nearly every study used monohydrate, and it's the cheapest. When you're looking into any compound, our compounds knowledge base shows what the evidence supports.
Creatine works on top of a solid program and enough protein. If you haven't sorted out protein yet, start with how much protein you need.
Build the training habit creatine is meant to support. Free to start.
Informational only, not medical advice. Consult a qualified clinician before changing medication, hormones, or supplements.
Garrett Wilson
Founder, MuscleBuddy
Garrett Wilson is the founder of MuscleBuddy, a longtime lifter and bodybuilder, and the engineer who built its training, nutrition, health and upkeep modules. He started MuscleBuddy out of his own spreadsheets, training seriously while managing health complications and autoimmune conditions with no product that would hold both halves at once. Where a guide here gives a health or training number, it cites the study the number comes from.
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