Quick answer: A creatine loading phase is 5–7 days of taking about 20 grams of creatine monohydrate per day (roughly 0.3 g per kilogram of body weight), split into 4 doses of 5 g. After that you drop to a maintenance dose of 3–5 g per day. Loading fills your muscles' creatine stores in about a week instead of three to four weeks. It is optional: taking 3–5 g daily from day one gets you to the same place, just slower.
| Loading | No loading | |
|---|---|---|
| Daily dose | ~20 g (0.3 g/kg), split 4× | 3–5 g |
| Duration | 5–7 days, then 3–5 g/day | Ongoing |
| Muscles saturated in | ~5–7 days | ~3–4 weeks |
| Typical early weight change | +1–2 kg (2–4 lb), mostly water inside muscle | Gradual, smaller |
| Stomach upset risk | Higher (large doses) | Low |
| Best for | You want the effect this week | You prefer fewer side effects, no rush |
Loading calculator — enter your weight to get your loading grams, a 4-dose schedule, your maintenance dose and the date your stores are full.
What "loading" actually does
Your muscles store creatine as phosphocreatine, which they use to regenerate ATP during short, hard efforts: a heavy set, a sprint, the last reps. Most people start with muscle creatine stores around 60–80% of their maximum. Supplementing raises those stores toward the ceiling. Loading just gets you there faster by front-loading the dose.
The classic protocol comes from the research that defined creatine supplementation: 20 g per day for 6 days raised muscle creatine by about 20%, and 2 g per day afterward kept it there. The same study found that 3 g per day for 28 days reached the same level without any loading. That single finding is the whole loading debate in one sentence: loading changes the speed, not the destination.
How to do a creatine loading phase (step by step)
- Work out your daily loading dose. Use 0.3 g per kg of body weight. For a 60 kg (132 lb) woman that is about 18 g; for an 80 kg (176 lb) man it is 24 g. If math isn't your thing, 20 g a day covers most adults.
- Split it into 4 doses. 5 g four times a day: with breakfast, lunch, dinner and one more with a snack. Splitting is not optional if you want to avoid stomach trouble. A single 20 g dose is the most common reason people quit in the first three days.
- Take each dose with food or a drink that has carbs or protein. Insulin slightly improves creatine uptake into muscle. A meal, a smoothie or juice works. You do not need to time it around training.
- Drink normally, plus a little. Creatine pulls water into muscle cells. You don't need to force liters; an extra glass or two spread through the day is enough. Being under-hydrated is what makes people feel cramped or bloated.
- Do it for 5–7 days. Five days is enough for most people; seven if you're heavier or want a margin.
- Switch to maintenance. 3–5 g once a day, every day, including rest days. This is the part that actually matters long term. See Creatine maintenance dose.
Download the 7-day loading checklist (printable)
How long is the creatine loading phase?
Five to seven days. Longer loading does not raise your stores further; once muscle is saturated, extra creatine is simply excreted. If you're still "loading" on day 10, you're just paying for expensive urine and inviting stomach issues.
How many grams of creatine for loading?
The standard is 20 g per day, and the more precise version is 0.3 g per kg of body weight per day:
| Body weight | Loading dose per day | Split as |
|---|---|---|
| 50 kg / 110 lb | 15 g | 3 × 5 g |
| 60 kg / 132 lb | 18 g | 4 × 4.5 g (or 3 × 5 g + 3 g) |
| 70 kg / 154 lb | 21 g | 4 × 5 g |
| 80 kg / 176 lb | 24 g | 4 × 6 g |
| 90 kg / 198 lb | 27 g | 4 × 7 g (or 5 × 5 g) |
Lighter people and most women can load on 15–18 g per day and get the same result with less stomach stress. There is no benefit to going above 25 g.
What happens during the loading phase, day by day
- Days 1–2: Nothing dramatic. Some people notice they're thirstier. If you took a single big dose, you may feel bloated or have loose stools; split the doses.
- Days 3–5: Weight on the scale may go up 1–2 kg (2–4 lb). This is water drawn into muscle cells alongside creatine, not fat and not "puffiness" under the skin. Muscles can look slightly fuller.
- Days 5–7: Stores are essentially full. Some people feel they can squeeze out an extra rep or two on hard sets. Many feel nothing yet; the performance effect is modest and shows up over weeks of training, not as a rush.
What happens after the loading phase
After loading, drop to 3–5 g a day and keep going. Your muscles hold the extra creatine as long as you keep taking it. If you stop completely, stores return to baseline over roughly 4–6 weeks; the water weight goes with them. There is no need to "cycle off" creatine; the evidence for cycling is essentially nonexistent, and consistent daily intake is what keeps the benefit.
Side effects of loading, and how to avoid them
The loading phase is where nearly all of creatine's reputation for side effects comes from, because it's the only time people take large single doses.
- Bloating and stomach upset: caused by large doses sitting in the gut and pulling water in. Fix: split into 4 doses, take with food, use micronized monohydrate, and don't take 20 g at once.
- Diarrhea or loose stools: same cause. Some people are fine at 5 g per dose and not at 10 g. Drop the per-dose amount and add a fifth dose if needed.
- Water weight: expected and harmless. It sits inside muscle, not under the skin. If the number on the scale bothers you, skip loading and use the slow approach.
- Cramps and dehydration: the research doesn't support creatine causing cramps, but being under-hydrated while loading makes people feel worse. Drink normally.
For the full breakdown and what's normal versus a reason to stop, see Creatine loading phase side effects.
Should you load at all?
Load if you want the full effect within a week: a competition, a training block starting Monday, or you're simply impatient and your stomach handles it. Skip loading if you've had stomach issues with supplements, you don't like the scale jumping, or you just want the simplest possible routine. Either way, you'll be in the same place after four weeks. We compare the two in detail in Do you need a creatine loading phase?.
Loading for women
Women store on average less creatine in muscle than men, so they respond at least as well to supplementation. Loading works the same way, and doses can be scaled by weight (15–18 g per day for most women instead of a flat 20 g). The most common reason women skip loading is water weight during a week they'd rather not see it; the slow 3–5 g approach avoids that entirely. Details in Creatine for women.
Safety notes
Creatine monohydrate is one of the most studied supplements, and daily use at 3–5 g is considered safe for healthy adults; loading doses for a week have also been studied extensively. Two things to know: creatine raises blood creatinine on lab tests, which can look like a kidney problem to a clinician who doesn't know you supplement, so tell your doctor before bloodwork. And if you have kidney disease, are pregnant or breastfeeding, are under 18, or take medication that affects the kidneys, talk to a clinician first. This article is educational and not medical advice.
FAQ
Can I take 20 g of creatine at once during loading?
You can, but most people who do get stomach cramps, bloating or diarrhea. Splitting into 4 doses of 5 g gives the same saturation with far fewer complaints.
Why did I gain weight after starting creatine?
Creatine pulls water into muscle cells. A gain of 1–2 kg (2–4 lb) in the first week is normal and is water inside muscle, not fat. It stays as long as you take creatine and goes away if you stop.
What happens if I skip the loading phase?
Nothing bad. Taking 3–5 g a day from the start reaches full muscle saturation in about 3–4 weeks instead of one. The end result is identical.
What are the first signs creatine is working?
Slightly fuller muscles and a small jump on the scale in week one; an extra rep or two on hard sets over the following weeks. Creatine doesn't give a "feeling" like caffeine.
Is 10 g a day enough for loading?
It's a middle path: faster than 3–5 g, gentler than 20 g. Stores fill in roughly 10–14 days at 10 g a day.
Do I need to load again if I miss a few days?
No. Stores fall slowly over weeks. Missing a day or two changes almost nothing; just resume your daily dose.
Should I load before or after a workout?
Timing during loading doesn't matter. Spread doses across the day with meals. For the maintenance dose, see before or after workout.
Sources
- Kreider RB 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.
- Hultman E et al. Muscle creatine loading in men. J Appl Physiol. 1996.
- Antonio J et al. Common questions and misconceptions about creatine supplementation: what does the scientific evidence really show? J Int Soc Sports Nutr. 2021.
- Smith-Ryan AE et al. Creatine Supplementation in Women's Health: A Lifespan Perspective. Nutrients. 2021.
Creatine Dosage team (Virix Labs). Educational content, not medical advice.