Creatine, Water Retention, Bloating and Body Weight: What the Evidence Shows
What studies measured about creatine and body water, scale weight, bloating and body fat, how much early weight gain is water, and what has not been studied.
Content last updated . This page has not been medically reviewed.
Quick answer
Creatine can raise scale weight a little, mostly in the first days. Studies that measure body water often explain that early rise as water held in the body. Reviews do not find that creatine adds body fat. Whether it makes people feel bloated is less clear, and as a weight-loss aid there is no usable research. This page is information only. Amounts mentioned are study amounts, not advice.
How the evidence is labeled
Evidence in adequately nourished people means trials in people with no deficiency. Mixed means studies disagree. Insufficient evidence means too little to judge. Proper evidence not found means we looked and found nothing usable.What the sources found
| Question | What the sources found | Label |
|---|---|---|
| Does scale weight go up? | A meta-analysis of 143 trials found creatine raised body mass by about 0.86 kg on average, a small effect that was bigger with resistance training. [1] A position stand says weight gain is the only consistently reported side effect. [2] | Evidence in adequately nourished people |
| Is the early gain water? | Early loading studies reported short-term fluid retention of about 0.5 to 1.0 L, roughly in line with the weight gained. [2] In 27 young adults given 0.3 g per kg for one week, total body water rose 2%. [3] | Mixed |
| Does it last? | A review notes several 5 to 10 week training studies found no rise in total body water, while one 8-week study found a 7.0% rise compared with placebo. [4] | Mixed |
| Inside or outside cells? | Studies split body water into inside cells (intracellular) and outside cells (extracellular). In one 8-week study, intracellular water rose 9.2% against 1.6% on placebo. [4] In 30 women after a 5-day loading protocol (4 x 5 g a day), all fluid compartments rose in one cycle phase. [5] Water under the skin is not described separately in the sources we read. | Mixed |
| Does it cause bloating? | Proper evidence not found. A PubMed search for creatine with bloating found no trial that measured it. A review of 685 trials found stomach-related issues were reported in slightly more creatine studies (4.9% against 4.3%). [6] | Insufficient evidence |
| Does it add body fat? | A review of trials from one week to two years concluded creatine does not increase fat mass across a variety of populations. [4] | Evidence in adequately nourished people |
| Does it help weight loss? | Proper evidence not found. We searched PubMed for creatine with weight loss, energy restriction and obesity and found no trial of creatine for losing weight. The meta-analysis found a tiny drop in body-fat percentage (about 0.28 points), which is not a weight-loss outcome. [1] | Insufficient evidence |
Why the numbers differ
- Different measures. Body-water tools estimate water from electrical signals. In one study, the gain from extra water was read as a rise in fat-free mass, which is not the same as new muscle. [3]
- Different people and timing. In the female study, body weight did not differ between groups. [5] Changes in water differed by menstrual cycle phase. [5] More on the page for women: cycle, pregnancy and menopause.
- Different lengths. Early loading studies are short. Longer studies often show smaller or no water change. [4]
- Who wrote the reviews. Several authors of the position stand and of the 2021 review declare creatine-industry ties, and so do some authors of the cited trials. See each citation below.
Hydration, cramps and heat
Because creatine holds water in cells, people have worried about dehydration and cramps. In one small trial, 12 active men took 21.6 g a day for 7 days, and creatine did not compromise hydration or heat tolerance in dehydrated, trained men exercising in the heat. [7] Their body mass rose 0.88 kg over that week. [7] In the 685-trial review, reports of muscle cramping or pain were more frequent in creatine studies (2.9% against 0.9%), but not when counted per participant (0.52% against 0.07%, a difference that was not statistically significant). [6] More detail: creatine side effects: stomach upset, cramps, dehydration and heat.Frequently asked questions
Does creatine cause water retention?
Often briefly. Early loading studies reported short-term fluid retention, but several longer training studies found no rise in total body water. [2] [4]
Is creatine weight fat or water?
Early gain is described mainly as fluid. [2] The 2024 meta-analysis found small gains in fat-free mass and a small fall in body-fat percentage, and a 2021 review found no increase in fat mass. [1] [4]
Does creatine cause bloating?
Proper evidence not found for bloating specifically. Stomach-related issues were reported in slightly more creatine studies than placebo studies. [6]
Can creatine help me lose weight?
Proper evidence not found. We found no trial testing creatine for weight loss.
Do I need to drink extra water?
The sources we read did not give personal fluid advice. In one heat trial, creatine did not worsen hydration. [7] Ask a clinician if you have kidney or heart conditions.
More details: evidence, limits and cautions
The details behind this page: cautions, limits of the evidence and where sources disagree. Open any note to read it.
Safety and who should ask first
- Kidneys. Creatine can raise the blood test creatinine without necessarily meaning kidney function has fallen. [4] People with kidney disease should ask a clinician first. See creatine, kidney questions and creatinine testing.
- Medicines. Water pills, anti-inflammatory painkillers and other medicines change fluid and kidney balance. The sources we read gave no interaction list for creatine. Proper evidence not found. Ask a pharmacist, and see medication interactions.
- Swelling or other warning signs. Sudden swelling, fast weight gain, or passing much less urine than usual should be checked promptly by a clinician. Call 911 for trouble breathing or chest pain. See warning signs: when to get medical help.
- Pregnancy and breastfeeding. A 2021 review noted no human studies of creatine in pregnancy. [4]
- Weight-class sport. Ask a coach or sports clinician before a weigh-in.
- Product quality. See quality testing and certifications. The overview is at creatine.
References
- Pashayee-Khamene F, Heidari Z, Asbaghi O, et al. Creatine supplementation protocols with or without training interventions on body composition: a GRADE-assessed systematic review and dose-response meta-analysis. J Int Soc Sports Nutr 2024 (abstract read; one author consults for a creatine manufacturer). Read 2026-10-22.
- Kreider RB, Kalman DS, Antonio J, et al. International Society of Sports Nutrition position stand: safety and efficacy of creatine supplementation in exercise, sport, and medicine. J Int Soc Sports Nutr 2017 (full text read via PMC5469049; prepared at the request of a supplement-industry council and the society; several authors declare industry ties). Read 2026-10-22.
- Buck EA, Saunders MJ, Edwards ES, Womack CJ. Body composition measured by multi-frequency bioelectrical impedance following creatine supplementation. J Sports Med Phys Fitness 2023 (abstract read). Read 2026-10-22.
- Antonio J, Candow DG, Forbes SC, et al. Common questions and misconceptions about creatine supplementation: what does the scientific evidence really show? J Int Soc Sports Nutr 2021 (full text read via PMC7871530; several authors declare creatine-industry funding or advisory roles). Read 2026-10-22.
- Moore SR, Gordon AN, Cabre HE, Hackney AC, Smith-Ryan AE. A Randomized Controlled Trial of Changes in Fluid Distribution across Menstrual Phases with Creatine Supplementation. Nutrients 2023 (abstract read; one author is an adviser to a creatine manufacturer). Read 2026-10-22.
- Kreider RB, Gonzalez DE, Hines K, Gil A, Bonilla DA. Safety of creatine supplementation: analysis of the prevalence of reported side effects in clinical trials and adverse event reports. J Int Soc Sports Nutr 2025 (abstract read). Read 2026-10-22.
- Watson G, Casa DJ, Fiala KA, et al. Creatine use and exercise heat tolerance in dehydrated men. J Athl Train 2006 (abstract read). Read 2026-10-22.
Education, not medical advice. This page is for general information. It does not diagnose or treat any condition and is not a substitute for care from a qualified health professional. Natural does not automatically mean safe. Ask a clinician or pharmacist before changing your care, especially if you take medication, are pregnant or breastfeeding, or have a health condition.