Any weight gain that would come that quick would just be water retention anyway. The benefit you will get once you've been on it long enough to get it built up in your system is going to be from being able to go harder at the gym which means better gains, but even then that's gonna take time.
Creatine for Gaining Muscle Weight
But studies are clear that a few days to a month of creatine supplementation is highly unlikely to result in significant, instantaneous lean muscle mass gains[*][*]. Keep in mind that creatine primarily works for adding muscle mass by increasing your performance in the gym.
The average weight gain in the first week is 1.5-3.5 pounds, though this is likely water retention in the muscles and body. Most lifters see an extra 2-4 pounds of muscle mass gained over 4-12 weeks of training while taking 3 grams of creatine daily.
It's because some people are slow-twitch muscle fiber dominant. These muscle fibers can store far less creatine than fast-twitch muscle fibers, so people with high percentage of slow-twitch muscle fibers don't need to get extra creatine through diet, because their body already produces enough creatine.
From increased strength and muscle fullness in the first few weeks to noticeable size and performance improvements within a few months, the creatine before and after timeline is both impressive and achievable.
Muscle Fullness and Increased Size
Creatine is a molecule that draws water into muscle cells, which therefore makes them look larger. In just a few weeks of supplementing with creatine, many athletes notice their muscles looking more full. This is a good sign that your muscle's creatine stores are being saturated.
"If you're working out, it just helps you work out a lot harder," McIlroy said, praising creatine. During the supplement chat with Scheffler, McIlroy called creatine one of the most effective and safe supplements ever—all while casually sipping on part of his daily dose combined with a fruit mix from a water bottle.
Conclusions: Creatine supplementation results in weight gain due to water retention, which may impede performance in mass-dependent activities such as running and swimming.
In general, creatine monohydrate may begin to show initial performance-enhancing effects within a week to a few weeks. Noticeable gains in muscle mass, strength, and performance typically become more apparent over several weeks to months of steady creatine supplementation and training.
If you're looking into creatine for its cognitive and muscle-building benefits, you may have heard to drink more water while using it. There's some truth to this — it's important to stay hydrated when taking creatine.
“Signs and symptoms of too much creatine include bloating, stomach cramping, possible muscle cramps (but this is linked to dehydration while taking creatine), nausea, diarrhea, temporary water retention and possible increase in thirst (also associated with effects of dehydration),” says O'Donnell-Giles.
It depends on your exercise routine. But some studies show that people who take creatine supplements may gain an extra two to four pounds of muscle mass during four to 12 weeks of regular exercise than people who don't take creatine.
It helps power your workouts – and your daily life.
But if you're just trying to stay active or keep up with your kids at the park, it can still help. “Creatine supports muscle strength in everyday activities, not just competitive sports. It may assist with maintaining function as you age, too,” Barrett notes.
A typical loading phase comprises 20 g of creatine (or 0.3 g/kg body weight) in divided doses four times a day for two to seven days; this is followed by a maintenance dose of 2 to 5 g daily (or 0.03 g/kg body weight) for several weeks to months at a time.
Doses up to 25 grams daily for up to 14 days have been safely used. Lower doses up to 4-5 grams daily for up to 18 months have also been safely used. Creatine is possibly safe when taken long-term. Doses up to 10 grams daily for up to 5 years have been safely used.
In just one month of using creatine monohydrate, you can expect noticeable results — increased muscle fullness, strength, energy, and endurance. It's not a magic pill, but with consistency, hydration, and a proper workout plan, creatine can take your fitness to the next level.
Collectively, results across these studies indicate that creatine supplementation immediately before and immediately following resistance training sessions (5–12 weeks) are both viable and safe strategies to augment the gains in muscle mass and performance over time.
Alternatively, you can skip the loading phase entirely and go straight to 3–5 grams per day. While this method takes a bit longer—typically about 4 weeks—to fully saturate muscles—it's equally effective over time and may be gentler on digestion.
Creatine might be unsafe for people with preexisting kidney problems. However, further research is needed.
👉 Bottom line: Current evidence shows creatine does not cause hair loss in healthy people without genetic predisposition.
While a standard daily dose of 3-5 g is ideal for long-term health and performance, short-term research suggests that higher doses (10–20 g/day split into smaller servings) may help buffer the cognitive impact of acute sleep loss. It won't replace sleep, but it can make the day after a rough night more manageable.
Potential positive effects of creatine supplementation
It contributes to rapid energy production and may enhance power or speed bursts requiring short periods of anaerobic activity. The reason could be related to the association of creatine supplementation and increased glycogen storage in muscle.
Creatine has long been used by athletes and fitness fanatics looking to boost their performance. Brad Pitt is also reportedly a proponent, crediting it for his age-defying physique, while fellow A-lister Mark Wahlberg is a fan, too.
Should I adjust my water intake during creatine loading versus maintenance phases? Yes, during loading phases (20g daily), increase water intake to 4-5 liters daily. During maintenance (3-5g daily), 3.5-4.5 liters is typically sufficient for most individuals, adjusted for activity level and climate.
For most individuals, the initial effects of creatine supplements become noticeable within seven to 14 days, while more substantial benefits for exercise performance and muscle growth typically emerge after two to four weeks of consistent use.