Does Creatine Make You Gain Weight?

It can, but usually only a little, and not as fat. In the first week, especially with a loading phase, creatine pulls some water into your muscles, which can add a pound or two on the scale. Over months of training, creatine helps you build more muscle, which adds weight you'd probably want. Research shows it doesn't increase fat.

Weight gain is the most common side effect people notice, and it's the one that scares off a lot of first-time users. The fix is understanding which kind of weight you're looking at. Here's the breakdown, with numbers from the research.

Why Do People Gain Weight When They Start Creatine?

Mostly because of water. Creatine draws water into muscle cells along with it, so as your muscle creatine rises in the first days, some extra water comes too. The jump is biggest with a loading phase, when people take around 20 g a day. Lower daily doses cause a smaller, slower change.

The International Society of Sports Nutrition (ISSN) position stand on creatine explains that creatine, like carbohydrate, has osmotic properties that help muscles hold a small amount of water. It notes that early loading studies saw short-term fluid retention of about 0.5 to 1.0 liters, roughly in line with the weight people gained. It also calls weight gain "the only consistently reported side effect" in creatine research.

A 2003 meta-analysis of 100 creatine studies in the International Journal of Sport Nutrition and Exercise Metabolism found the body composition effect was larger after short loading regimens than during regular maintenance doses. So the people who notice the scale moving most are usually the ones who start with a big loading phase.

How Much Weight Do You Gain on Creatine?

Expect roughly 1 to 2 pounds of water in the first week if you load, and less if you start with a small daily dose. Over a few months of lifting, the bigger change is muscle: creatine users gained about 1 kg (2.4 lb) more lean mass than people training without it.

Here's how the different types of weight compare:

Type of weight	How much	When	Source
Water in muscle	About 0.5 to 1.0 liters (1 to 2 lb)	First days of loading	ISSN position stand, 2017
Lean mass from training	About 1.1 kg (2.4 lb) more than placebo	Over weeks to months of resistance training	Meta-analysis of 35 trials, 2022
Fat	No meaningful increase	Any time	Randomized trials from one week to two years

The lean mass figure comes from a 2022 meta-analysis of 35 randomized trials in the journal Nutrition, covering 1,192 people. Creatine combined with resistance training increased lean body mass by 1.10 kg compared with placebo. Without exercise, creatine made essentially no difference to lean mass, at 0.03 kg. In other words, the muscle comes from training harder with creatine's help, not from the powder itself.

Does Creatine Make You Gain Fat?

No. Randomized trials lasting from one week to two years have not found that creatine increases fat mass. If anything, when combined with resistance training, creatine is linked to a very small drop in body fat percentage, because lean mass goes up while fat stays about the same.

A 2021 review of creatine myths in the Journal of the International Society of Sports Nutrition addressed this directly. It found that controlled trials "do not validate" the idea that creatine increases fat mass, and concluded simply that "creatine supplementation does not increase fat mass."

A 2023 meta-analysis in Nutrients looked at adults under 50 doing resistance training. Across 12 studies and 266 people, creatine users saw a very small reduction in body fat percentage (1.19 points), with no real change in actual fat mass. The scale may go up a little, but the extra weight isn't fat. If your goal is to drop fat while adding muscle, how to lose fat and gain muscle lays out the protein and training targets.

Does the Water Weight Go Away?

Usually, yes, or at least it stops being noticeable. Water retention is most common in the first several days, and several longer training studies found no lasting increase in total body water. If you stop creatine entirely, the extra creatine and its water gradually leave your muscles over about a month.

The 2021 review notes that the most common effect is water retention "in the early stages (first several days)." It then lists training studies of 5 to 10 weeks where creatine users showed no significant increase in total body water, including protocols that started with a loading phase. Not every study agrees, but the idea that creatine keeps you puffy indefinitely isn't well supported. If you're wondering whether that water also means more bathroom trips, our guide on whether creatine makes you pee more covers it.

If you do decide to stop, our guide on what happens when you stop taking creatine walks through the week-by-week timeline, including the water.

Can You Avoid Creatine Weight Gain?

You can make it smaller by skipping the loading phase. Taking 3 to 5 g a day from the start raises muscle creatine more gradually, which avoids the sudden jump on the scale. You still reach full muscle stores, just in three to four weeks instead of one.

The classic evidence comes from a 1996 study in the Journal of Applied Physiology: muscle creatine rose about 20% after six days at 20 g a day, and the same increase happened over 28 days at 3 g a day. Same destination, slower route.

For athletes in weight-class sports, that slower route is often the smart choice before a weigh-in. Our guide on whether you need a creatine loading phase compares the two approaches in more detail, and how long creatine takes to work covers what to expect week by week.

Does Creatine Make Women Gain Weight?

Women can see the same small early water gain, but the muscle effect appears smaller on average. In the 2022 meta-analysis, men on creatine gained 1.46 kg more lean mass than placebo, while women gained 0.29 kg, which wasn't statistically significant. The research on women is thinner, so those numbers may change.

The 2021 review concluded that creatine "provides a variety of benefits for females across their lifespan," and fat gain isn't one of the effects reported. For women who are cautious about the scale, a steady 3 g daily dose without loading is the gentlest way to start.