Creatine side effects: real vs myth
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Real side effects
- Water weight: 1 to 2 kg in the first weeks, especially with loading. This is water stored in muscle.
- Stomach upset or diarrhea: mostly with single doses of 10 g or more. Split doses and take with food.
- Higher creatinine on blood tests: creatine breaks down into creatinine, so labs may show a higher number that can be mistaken for reduced kidney function. Tell your doctor you take creatine.
Myths
- Kidney damage: studies in healthy people haven't shown harm at recommended doses. If you have kidney disease, talk to your doctor first.
- Cramping and dehydration: research in athletes hasn't supported this; some studies even showed fewer cramps.
- Hair loss: a 2025 randomized trial found no effect on hair or DHT. Full breakdown.
- "It's a steroid": creatine is a natural compound found in meat and fish and made by your body. It isn't a hormone.
Who should check with a doctor first
People with kidney or liver disease, people taking medications that affect the kidneys, and anyone pregnant or breastfeeding.
Minimizing side effects
- Take 3 to 5 g a day without loading.
- Take it with food and plenty of fluids.
- Choose a tested product. Our picks.
Frequently asked questions
What are the side effects of creatine?
Mainly water weight and stomach upset at high doses. Serious side effects haven't been shown in healthy people at recommended doses.
Is creatine bad for your kidneys?
Research in healthy people hasn't shown harm. It can raise creatinine on lab tests, which isn't the same as kidney damage.
Does creatine cause hair loss?
Current evidence says no. See our full guide.
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