Creatine: honest answers to common questions

Creatine helps your muscles produce energy during short, intense efforts like lifting, sprinting, and jumping. Your body stores it in muscle and uses it to rapidly recycle ATP, the molecule that powers quick, powerful movements. Taking about 5 g a day raises those stores, which supports strength, power, and muscle growth when you also train. It is the most researched sports supplement available.

Yes, daily use is the normal way to take creatine. Research following healthy adults for months, and in some studies years, has found it well tolerated, with weight gain from water the most consistent effect. A steady 5 g a day, including rest days, keeps your muscle stores topped up. If you have a health condition, check with a doctor first.

In healthy people, research has not shown that creatine at recommended doses harms the kidneys. Creatine does raise creatinine, a marker doctors use to estimate kidney function, but that reflects the supplement itself rather than kidney trouble. If you have kidney disease or risk factors, talk to your doctor before starting, and mention creatine before any kidney blood test.

There is no good evidence that creatine causes hair loss. The worry comes from a single 2009 study that found a rise in DHT, a hormone linked to male-pattern hair loss. That study did not measure hair at all, and later research has not repeated the DHT finding or reported balding. We cover this in detail on its own page.

For most people there are few. The most consistent effect is a small gain in scale weight from extra water held in the muscle. Some people get mild stomach upset, usually from taking a large dose at once on an empty stomach, which smaller daily doses with food avoid. Older claims that creatine causes cramps or dehydration are not supported by research.

It depends on how you start. A daily 5 g dose fills your muscle stores in about three to four weeks. A short loading phase of around 20 g a day, split into smaller doses for five to seven days, fills them faster, in under a week, then you drop to 5 g. Loading is optional. Either way you reach the same place.

Creatine works best alongside training, since the strength and muscle benefits show up when you challenge your muscles. Without exercise you will still raise your muscle stores, but you will not see the same performance gains. Some research is looking at creatine for general health and brain function, but for the classic benefits, pair it with resistance training.

It can be helpful. In older adults, creatine combined with resistance training has been shown to add more muscle and strength than training alone. Holding on to muscle matters more with age, so this is one of the more promising uses. As always, an older adult with health conditions or medications should run it by their doctor first.

Creatine is not a weight-loss or fat-loss supplement. In fact it can nudge the scale up early on by drawing a little water into your muscles, which is not fat. What it can do over time is support muscle and training quality, and more muscle helps your body composition. Judge it by the mirror and your lifts, not the scale.

Creatine is found mainly in animal foods, especially red meat and fish such as herring, salmon, and tuna. A typical serving of meat or fish has roughly 1 to 2 grams. You would need to eat a lot to match a 5 g supplement dose, which is one reason vegetarians and vegans tend to have lower muscle creatine and may notice more from supplementing.

You do not need to be an athlete. Anyone doing resistance training who wants more strength and muscle can benefit, and the safety record in healthy adults is strong. It is optional, not essential, and it works on top of the basics like good sleep, enough protein, and consistent training rather than replacing them.

Mostly old reputation. Creatine got lumped in with steroids and surrounded by gym myths about kidneys, cramps, and hair loss, none of which hold up well in research. Major sports nutrition bodies consider creatine monohydrate both effective and safe for healthy adults. A doctor may still advise caution for specific conditions, which is worth a personal conversation.

Most healthy adults can take creatine, but some people should check with a doctor first. That includes anyone with kidney disease or kidney risk factors, people who are pregnant or breastfeeding, and teenagers, where there is less research. If you take prescription medication or have a chronic condition, a quick word with your doctor or pharmacist is sensible.