Dose and timing

Is 10 grams of creatine too much?

By GyroscopeUpdated November 14, 20266 sources

Not for most healthy adults, but split it into two servings. In a 28-day trial of 59 soccer players, one 10 g dose a day gave 56% of them diarrhea, against 29% on two 5 g doses and 35% on placebo. Most people don’t need more than 5 g a day.

There are two camps on 10 g. One figures that if 5 g is good, a double scoop must be better, especially for a big person. The other has heard that creatine is hard on the kidneys and assumes anything over the label dose is asking for trouble. The trials mostly disagree with both.

The stomach is the real limit

The 2008 trial is the clearest answer. Sergej Ostojic and Zlatko Ahmetovic gave 59 top-level soccer players creatine for 28 days, as two 5 g doses a day, one 10 g dose a day, or a placebo, and asked them to report any stomach trouble.

The two 5 g doses were no worse than placebo. The single 10 g dose nearly doubled it. Even a third of the placebo group reported diarrhea. A 2021 review of creatine questions gives the same advice for loading weeks, which is to keep each serving at 10 g or under.

It’s like eating one huge meal instead of the same food spread over the day. Your gut copes with the total, and the one big hit is what causes trouble.

Is 10 g safe for your kidneys?

In healthy people, researchers haven’t found harm at that dose. In a 2008 trial, 18 healthy young men took about 10 g a day for three months while doing aerobic training, and cystatin C, a kidney marker that muscle barely affects, fell slightly in both groups. A 2026 trial gave 64 middle-aged adults 10 g a day, as two 5 g servings, for 12 weeks, and the authors reported it was well tolerated. The International Society of Sports Nutrition notes that patients in medical studies have taken up to 30 g a day for as long as five years.

What 10 g will do is raise creatinine on a blood test a bit more, since fuller muscles break down more creatine into creatinine. Tell your doctor how much you take before any blood work.

Who needs more than 5 g

Most people don’t. Your muscles have a ceiling, and once they’re full the extra leaves in your urine. In a 1992 trial, three people taking 30 g a day passed 40 to 68% of it in their urine over the first three days.

The exception is size and training. The International Society of Sports Nutrition says larger athletes in hard training may need 5 to 10 g a day to keep stores full, and the 2021 review gives 0.1 g per kg as another way to dose, which is 8 g at 176 lb (80 kg). Our dose tool shows that line from 220 lb (100 kg) with four or more training days a week, and still starts you at 5 g.