Does creatine make you gain weight? Usually a little, and early. A 2021 review in the Journal of the International Society of Sports Nutrition says the 20 g/day loading phase typically adds 1-3 kg of body mass, mostly water, and that creatine does not increase fat mass. Skip loading and 3-5 g/day fills muscle more slowly.
This is an evergreen explainer. On 8 October 2026 this desk read the full text of Common questions and misconceptions about creatine supplementation by Antonio, Candow, Forbes, Gualano, Jagim, Kreider and five co-authors (PMID 33557850). They are researchers writing a review, not a regulator issuing a ruling.
Is creatine weight gain just water?
Mostly, at first. The review traces the water-weight belief to early research at 20 g/day for six days, and calls water retention in the first several days the most common adverse effect. Its complaint is that a short-term response became a long-term rule. Here is what the longer trials it cites found:
| Trial cited | Protocol | Body water result |
|---|---|---|
| Resistance-trained males | ~20 g/day for 7 days, then ~5 g/day for 28 days | No significant change in ICW, ECW or TBW |
| Resistance-trained males | 20 g/day for 7 days, then 5 g/day for 21 days | No significant increase in ICW, ECW or TBW |
| Non-resistance-trained males | 0.3 g/kg lean mass for 5 days, then 0.075 g/kg for 42 days | No significant change in TBW |
| Powers et al., men and women (n = 32) | 28 days | Body mass and TBW up; ICW and ECW unchanged |
| Ribeiro et al., with resistance training | 8 weeks | TBW up 7.0% and ICW 9.2% in the creatine group, against 1.7% and 1.6% on placebo |
TBW is total body water; ICW and ECW are the water inside and outside cells. The review’s summary: some evidence of short-term retention, mainly inside cells, and several studies showing no change in total body water relative to muscle mass over longer periods. It adds that lean-mass gains in 7-day studies are likely explained by water.
Does the creatine loading phase cause more weight gain?
That is where the 1-3 kg comes from. The review defines loading as 20-25 g/day for 5-7 days, or 0.3 g/kg/d, which is 21 g/day for a 70 kg lifter. It does not call loading required: in the Hultman study it cites, muscle creatine rose by about 20% after either 3 g/day for 28 days or 20 g/day for 6 days. Non-loading doses work but delay maximum storage.
What should a tested lifter check instead of the scale?
The label, not the bathroom scale. Our creatine monohydrate review covers the ingredient itself. If you are drug-tested, start with the NSF Certified for Sport pre-workouts and remember certification is a batch claim.
FAQ
Does creatine make you gain fat?
Not according to the review. Its fat-mass section closes with one line: creatine supplementation does not increase fat mass across a variety of populations. It also notes that short studies lasting 6-8 weeks found no change in fat mass. Early gains on the scale are mostly water.
Does everyone gain weight on creatine?
No. The review’s 1-3 kg figure is what the 20 g/day loading phase typically produces, not a promise. Several training trials it cites found no significant rise in total body water at all. It gives no comparable weight figure for the slower 3-5 g/day route, so this desk does not invent one.
Does creatine cause bloating?
The review’s full text never uses the word. What it does say is that loading-phase doses above 10 grams at a time may potentially lead to gastrointestinal distress, meaning diarrhea, so it tells athletes who load to split the day into servings of 10 grams or less.
Nothing here is medical advice, and none of it rules on a specific tub. A jump on the scale in week one is what the review calls the most common adverse effect, not a verdict on your diet. If you have a medical condition, ask your doctor before you load.