Most of the weight you gain from creatine is not permanent. The initial 1 to 3 pounds that show up on the scale in the first week or two come from water being pulled into your muscle cells, and that water weight disappears after you stop supplementing. However, if you’ve been training while taking creatine, any actual muscle you built stays with you, as long as you keep training.
Why Creatine Causes Quick Weight Gain
Creatine is an osmotically active substance, meaning it draws water toward it. When you supplement with creatine, your muscles store more of it than they normally would. That higher concentration inside the muscle cell creates an imbalance in pressure between the inside and outside of the cell, so water flows in to even things out. The result is fuller, more hydrated muscle cells and a bump on the scale.
During a loading phase, where you take 20 to 25 grams per day for five to seven days, body weight can increase by roughly 2%. For a 170-pound person, that’s about 3.4 pounds. If you skip the loading phase and go straight to a maintenance dose of 3 to 5 grams per day, the same saturation happens more gradually over a few weeks, and the weight gain is slower and less noticeable.
What Happens When You Stop
When you stop taking creatine, your muscles gradually release that extra stored water and body weight drops. The timeline, though, is slower than most people expect. One study found that after 30 days without creatine, muscle creatine stores still hadn’t returned to baseline, and participants maintained an average of about 2 kilograms (4.4 pounds) of extra body mass. In some people, the washout period may stretch beyond a month before the scale fully returns to where it started.
So the water weight is temporary, but “temporary” can mean several weeks rather than a few days. If you stop creatine and weigh yourself three days later expecting a big drop, you’ll likely be disappointed. Give it at least four to six weeks for a full picture.
Water Weight vs. Actual Muscle
This is the distinction that really matters. Creatine causes two separate types of weight gain, and they behave very differently.
The first type is water retention. A study published in Nutrients measured lean body mass after just a seven-day creatine loading period with no exercise. The supplement group gained about 0.5 kilograms more lean mass than the placebo group, but this was almost entirely water inside muscle cells, not new muscle tissue. When both groups then completed a resistance training program, the creatine group didn’t gain any more lean mass than the placebo group, confirming that the early bump was water, not structural muscle growth.
The second type is genuine muscle tissue built through training. Creatine helps you train harder by recycling your muscles’ primary short-burst energy source faster. That lets you squeeze out a few more reps or lift slightly heavier, and over weeks and months, that extra training volume adds up to real muscle growth. This muscle is no different from muscle built without creatine. It’s yours.
Do You Keep the Muscle After Stopping?
Yes. A study in older men who had combined creatine with 12 weeks of resistance training found that after stopping creatine for another 12 weeks, they lost no strength, no muscular endurance, and no lean tissue mass, as long as they continued some level of training. The creatine helped them build the muscle, but the muscle didn’t depend on creatine to stick around.
Think of creatine as a training amplifier rather than a building material. It helps you do more work in the gym, and the muscle you build from that work is maintained the same way all muscle is maintained: by continuing to use it. If you stop both creatine and training at the same time, you’ll lose muscle over time, but that would happen regardless of whether creatine was ever involved.
How Much of Your Weight Gain Is Water
If you’ve been taking creatine for only a week or two without significantly changing your training, nearly all of the weight gain is water. If you’ve been taking it for months while training consistently, the picture is mixed. A reasonable estimate for most people:
- Water retention: 1 to 3 pounds, sometimes up to 4 to 5 pounds during a loading phase. This is reversible.
- Muscle tissue: Whatever you’ve built through training. The rate varies, but a few extra pounds of muscle over several months of consistent lifting is realistic. This is permanent as long as you keep training.
You can’t easily tell the two apart on a bathroom scale. If you want a clearer picture, body composition measurements like a DEXA scan or even simple progress photos over time will tell you more than your weight alone. The scale going up 5 pounds after three months of creatine plus training is a much better sign than the scale going up 3 pounds after one week of creatine with no training. The first scenario likely includes real muscle. The second is almost entirely water.
Staying on Creatine Long Term
Many people take creatine continuously and never cycle off. In that case, the water weight stays as long as you keep supplementing, but it stabilizes. You won’t keep gaining water weight month after month. Your muscles hit a saturation point within a few weeks, and after that, the maintenance dose simply keeps stores topped off.
If the number on the scale bothers you, it helps to reframe what that weight actually is. The extra pounds from water retention sit inside muscle cells, not under your skin or around your organs. They make your muscles look fuller, not bloated. For most people, this is cosmetically neutral or even desirable. The weight gain only becomes a practical concern in sports where you compete in a weight class or where carrying extra mass costs energy, like distance running.