Most supplements promise far more than they deliver. Creatine is the exception. It has been studied in hundreds of trials over three decades, and the evidence is consistent: it helps you train harder, gain more strength and build a little more muscle.
Key points
- Creatine helps your muscles produce energy for short, intense efforts.
- It improves strength, power and muscle gain when combined with training.
- Take 3–5 g of creatine monohydrate a day. Loading is optional.
- It is safe for healthy adults at recommended doses.
- Expect 1–2 kg (2–4 lb) of weight gain early on, mostly water inside the muscle.
What is creatine?
Creatine is a natural compound made in your body from amino acids and found in meat and fish. Most of it is stored in your muscles as phosphocreatine. A normal diet provides about 1–2 g a day, which leaves muscle stores around 60–80% full. Supplementing tops them up.
How creatine works
Short, intense efforts, like a heavy set or a sprint, are powered by ATP, your cells’ energy currency. ATP runs out within seconds. Phosphocreatine rebuilds it rapidly. More creatine in your muscles means you can keep producing high power for a little longer, which lets you do an extra rep or two in each set.
Over weeks and months, those extra reps add up to more training and better results.
What creatine does
According to the International Society of Sports Nutrition, creatine supplementation:
- Increases strength and power in exercises like the bench press, squat and sprinting.
- Increases lean body mass when combined with resistance training.
- Improves repeated high-intensity performance, such as interval training and team sports.
- May support recovery between hard sessions.
It does little for long, steady endurance exercise.
How to take creatine
| Method | How | When you see effects |
|---|---|---|
| Daily dose | 3–5 g a day | About 3–4 weeks |
| Loading | About 20 g a day in 4 doses for 5–7 days, then 3–5 g a day | About 1 week |
Both methods end up in the same place. Loading only gets you there sooner, and some people find it causes stomach discomfort.
Which type of creatine?
Creatine monohydrate. It is the form used in almost all research, it works, and it is inexpensive. Buffered, liquid and other forms have not been shown to work better. Look for a product that has been third-party tested.
Timing
Take it whenever suits you. Consistency matters much more than timing. Many people take it with a meal or in a post-workout shake.
Side effects and safety
At recommended doses, creatine is safe for healthy adults. The ISSN reports that intakes up to 30 g a day for five years have been well tolerated in healthy people.
- Weight gain: expect 1–2 kg early on, mostly water stored in muscle. It is not fat.
- Stomach upset: usually only with large single doses. Split doses or skip loading.
- Blood tests: creatine can raise creatinine, a marker used to check kidney function. Tell your doctor you take it.
Creatine myths
- “Creatine is a steroid.” No. It is a natural nutrient found in food.
- “It damages the kidneys.” Not in healthy people at normal doses.
- “It causes dehydration and cramps.” Research does not support this; if anything, the opposite.
- “It causes hair loss.” Based on one small study of a related hormone, never confirmed.
- “You need to cycle it.” No evidence supports cycling.
Who benefits most?
Almost anyone who does strength or high-intensity training. Vegetarians and vegans often see bigger effects, because they get little creatine from food. Research is also exploring benefits for older adults and brain health.
If you are under 18, pregnant or have a medical condition, speak to a doctor before using any supplement.
Summary
Creatine monohydrate at 3–5 g a day is one of the few supplements with strong evidence behind it. It will not replace good training and nutrition, but it can help you get a little more out of both.