What creatine actually does
Your muscles store creatine mostly as phosphocreatine, which regenerates ATP, the molecule that powers short, hard muscle contractions. During a heavy set of five or a 10-second sprint, phosphocreatine is a major energy source.
Your body makes about 1 g of creatine a day, and a diet with meat and fish supplies roughly another 1 to 2 g. That leaves muscle stores at around 60 to 80 percent of their capacity. Supplementing tops them up.
Fuller stores let you squeeze out an extra rep or two at a given weight and recover slightly faster between sets. Over weeks, that extra work adds up to more strength and more muscle than the same training without it. Creatine does not build muscle on its own; it lets you train a little harder.
What the evidence shows
The International Society of Sports Nutrition position stand (Kreider et al., Journal of the International Society of Sports Nutrition, 2017) reviewed hundreds of studies and concluded that creatine monohydrate is the most effective nutritional supplement available for increasing high-intensity exercise capacity and lean body mass.
- Strength: modest but reliable improvements when combined with resistance training.
- Lean mass: typically an extra 1 to 2 kg (2 to 4 lb) over a training block of several weeks, part of which is water held inside the muscle.
- Repeated sprints: better performance in sports with short bursts and brief rest, like football or court sports.
- Endurance: little direct benefit for steady aerobic work.
Response varies. People with low starting stores, including many vegetarians and vegans, tend to see the largest effect. A minority of people who already eat a lot of meat notice very little.
How much to take, and when
The standard maintenance dose is 3 to 5 g per day, every day, including rest days. Larger people sit at the upper end; smaller people do fine with 3 g.
| Approach | Dose | Time to full stores |
|---|---|---|
| Daily dose only | 3-5 g/day | About 3-4 weeks |
| Loading phase | 20 g/day split into 4 doses, 5-7 days, then 3-5 g/day | About 1 week |
Loading is optional. It gets you to saturation faster, but you end up in the same place a few weeks later either way. Splitting a 20 g day into four 5 g servings reduces the stomach upset that one large dose can cause.
Consistency matters far more than timing. Pick a time you will not forget, such as with breakfast, and take it every day.
A few studies hint that taking creatine close to training, especially after, is slightly better, but the differences are small and inconsistent. Because creatine works by keeping stores topped up, the daily total is what counts.
Taking it with a meal containing carbohydrate and protein may improve uptake a little and is easier on the stomach. Mixing it into a protein shake, water or juice all works. Coffee does not cancel it out in normal amounts.
Which type to buy
Buy plain creatine monohydrate. It is the form used in nearly all the research, and it is the cheapest. Micronised monohydrate dissolves more easily but works the same.
Creatine HCl, buffered creatine, creatine ethyl ester and liquid creatine cost more and have not been shown to work better. Some, like liquid forms, are less stable.
If you compete in a tested sport, choose a product carrying a third-party certification such as Informed Sport or NSF Certified for Sport, which screens for banned substances.
Myth: creatine causes hair loss
This claim traces back to one small study of college rugby players (van der Merwe et al., Clinical Journal of Sport Medicine, 2009). After three weeks of creatine, levels of DHT, a hormone linked to male pattern baldness, rose compared with placebo.
The study did not measure hair loss. DHT stayed within the normal range, and the finding has not been replicated in the years since. Other studies on creatine and testosterone-related hormones have not found meaningful changes.
The honest summary: there is no direct evidence that creatine causes hair loss. If you have a strong family history and are worried, that is a reasonable conversation to have with a dermatologist, but the evidence does not support avoiding it on these grounds alone.
Myth: creatine damages your kidneys
In healthy people, studies lasting up to several years at normal doses have not found harm to kidney function. The ISSN position stand describes it as safe for healthy individuals at recommended doses.
The confusion comes from blood tests. Creatine breaks down into creatinine, the marker doctors use to estimate kidney function. Supplementing can nudge creatinine up, which looks like reduced kidney function on paper when it is not. Tell your doctor you take creatine before any blood test.
If you already have kidney disease, diabetes affecting the kidneys, or take medications that strain them, speak to your doctor before using creatine. The same applies if you are pregnant, breastfeeding, or under 18.
Water weight, bloating and cramping
Expect the scale to rise by about 1 to 2 kg (2 to 4 lb) in the first few weeks. That water is stored inside muscle cells, not under the skin, so it does not make you look softer. If you are tracking a fat loss diet with the weight loss calculator, account for this jump rather than cutting calories further.
Bloating is mostly a loading-phase issue and usually disappears at 3 to 5 g a day. Reviews have not found that creatine increases cramping or dehydration; if anything, some data suggest the opposite. Drinking enough water is sensible regardless, and the water intake calculator gives you a starting number.
Who benefits most
Creatine helps most in training built on short, hard efforts. That covers most gym goers, but the size of the effect varies.
| Who | Expected benefit | Why |
|---|---|---|
| Lifters training for strength or muscle | Clear | Sets of 1-15 reps lean heavily on phosphocreatine |
| Vegetarians and vegans | Often larger | Little dietary creatine, so lower starting stores |
| Team and court sport players | Clear | Repeated sprints with short rests |
| Older adults who lift | Moderate | May help preserve muscle and strength alongside training |
| Pure endurance athletes | Small | Steady aerobic work relies on other energy systems |
If you do not train, creatine on its own will do very little for your body composition. It amplifies work; it does not replace it.
Getting started: a simple checklist
- Buy plain creatine monohydrate, ideally third-party tested.
- Take 3 to 5 g once a day with a meal. Use a 5 ml teaspoon as a rough guide if your tub has no scoop; a level teaspoon is about 4 to 5 g, but check your product's label.
- Expect a 1 to 2 kg rise on the scale over the first few weeks.
- Give it at least four weeks before judging whether it helps.
- Tell your doctor you take it before any blood test.
Judge the effect by your training log, not by how you feel. Look for an extra rep at the same weight, or slightly better performance on the last set of an exercise, compared with the month before you started.
Creatine does not need cycling, does not go off quickly when kept dry, and does not need special drinks. If a product promises dramatic results from a fancy form, you are paying for marketing.
Do you need it?
No supplement is required to build muscle. Training with progressive overload, eating enough protein (see how much protein you need) and sleeping well matter far more.
Once those are in place, creatine is the one supplement most worth considering. It costs very little per day, the downside for a healthy adult is a little water weight, and the upside is a small but real edge in every session.
If you try it for two months and see no change in your training log, you may be one of the people who already have high stores. Stopping is perfectly reasonable; nothing bad happens when you do.
Frequently asked questions
Should I cycle creatine on and off?
There is no evidence that cycling is necessary. Your body does not build a tolerance, and stores drop back to baseline over about four to six weeks after you stop, so cycling mostly means losing the benefit for part of the year.
Can women take creatine?
Yes. Research in women shows similar benefits for strength and lean mass, and women often have lower starting stores. The same 3 to 5 g daily dose applies; check with a doctor if pregnant or breastfeeding.
Will creatine make me fat?
No. Creatine contains no calories worth counting. The early weight gain is water held inside muscle, typically 1 to 2 kg, and it levels off after the first few weeks.
Do I need to take creatine on rest days?
Yes. Creatine works by keeping muscle stores saturated, so take your normal dose every day. Timing on rest days does not matter.
Is creatine a steroid?
No. Creatine is a compound made naturally in your body from amino acids and found in meat and fish. It does not act like an anabolic steroid and is not banned by sports bodies.
General information for healthy adults, not medical advice. See our medical disclaimer.
