Creatine Loading Phase: How to Do It, and Whether You Should

A creatine loading phase means taking about 20 g of creatine a day, split into four 5 g doses, for 5 to 7 days, then dropping to 3–5 g a day. It fills your muscles in about a week instead of three to four. It is optional: a daily 3–5 g dose reaches the same level, just later, with less water weight and less chance of an upset stomach.

So the real question is not how to load, but whether a one-week head start is worth a few extra pounds on the scale and a higher risk of bloating. For most people it is not. For a few, it is. Here is the protocol, the evidence behind it, and how to decide.

How this article was put together

I read the muscle-biopsy study that defined the loading protocol, the position stands of the International Society of Sports Nutrition (ISSN), a dose-comparison trial on stomach side effects, and a 2025 preprint that compared loading with no loading over 28 days. All are listed under Sources. I have not run a trial myself, and nobody here “tested” a loading phase for this article. This is general information, not medical advice.

What a loading phase actually does

Creatine works by raising the amount stored in your muscles, which lets you squeeze a little more out of short, hard efforts. Nothing happens until those stores rise, and that is the whole point of loading: to raise them quickly.

The protocol comes from a 1996 study by Hultman and colleagues in the Journal of Applied Physiology, which took muscle biopsies from 31 men:

• 20 g a day for 6 days (four doses of 5 g) raised muscle creatine by about 20%.
• 3 g a day for 28 days reached the same level, more slowly.
• After loading, 2 g a day was enough to keep stores full.

In other words, loading changes when you arrive, not where. After about a month, someone who loaded and someone who did not have the same muscle creatine. For the full week-by-week picture, see how long creatine takes to work.

How to do a creatine loading phase

The ISSN describes loading as about 0.3 g per kilogram of body weight per day for 5 to 7 days, followed by 3–5 g a day. For most adults that rounds to the familiar 20 g. Scaled to body weight:

Body weight	Daily loading dose (0.3 g/kg)	Per dose (4 a day)
120 lb (54 kg)	about 16 g	about 4 g
150 lb (68 kg)	about 20 g	5 g
180 lb (82 kg)	about 24 g	about 6 g
210 lb (95 kg)	about 28 g	about 7 g

The practical routine

• Split it. Four doses spread through the day, for example breakfast, lunch, afternoon and dinner. Do not take the whole day’s amount at once (see the stomach section below).
• Take it with food. A meal with carbohydrate or protein may help your muscles take it up. The classic 1996 work by Green and colleagues used about 90 g of sugar per 5 g dose, which is far more than anyone needs; a normal meal is the sensible version.
• Drink normally, plus a little. Creatine pulls water into muscle. You do not need gallons, but do not start a loading week dehydrated.
• Stop after 5–7 days. Longer loading adds nothing: once muscles are full, the excess is excreted.
• Then 3–5 g a day, every day, including rest days. Timing barely matters; see creatine before or after a workout.

Is a loading phase worth it?

It comes down to whether a three-week head start matters to you.

Loading makes sense if:

• You have a competition, a test or a training block starting within the next month and want full stores by then.
• You restarted creatine after a long break and want to be back to full quickly.
• You do not mind 1–3 kg (2–6.5 lb) of extra scale weight in the first week.

Skip it if:

• You are in no hurry. Creatine is a long-term supplement, and the benefits in strength and muscle build over months of training either way.
• You have a sensitive stomach, or creatine has bloated you before.
• You compete in a weight class or are about to weigh in.
• You simply want the simplest routine: one scoop a day.

There is no good evidence that loading produces more muscle or strength in the long run. A 2021 meta-analysis of older adults in Nutrients did find some strength results that depended on loading, but it compared groups of studies, not loading against no loading head to head, so it cannot settle the question.

Side effects of loading

Water weight

The most common and most visible effect. Creatine draws water into muscle cells, and loading does it faster, so a gain of about 1–3 kg (2–6.5 lb) in the first week is typical, according to a 2021 ISSN review. This is water inside the muscle, not fat, and it is not the same as puffiness under the skin. It stays as long as your stores stay full and fades over a few weeks if you stop. More detail in does creatine make you gain weight?

Stomach upset and bloating

This is where dose size matters. In a 2008 study of 59 male soccer players, Ostojic and Ahmetovic compared 10 g of creatine taken in one go with the same 10 g split into two 5 g doses. Diarrhea was reported by 55.6% of the single-dose group versus 28.6% of the split-dose group, and the split-dose group did no worse than placebo overall. The lesson for loading: four small doses, not one or two big ones.

A 2025 preprint (Wagner and colleagues, not yet peer reviewed, funded by the supplement company Vireo Systems) randomised 24 healthy men and women to either 5 g a day or a 20 g-a-day loading phase for 14 days before 5 g a day. Self-reported stomach and fluid symptoms such as bloating and puffiness were common in both groups, and more frequent and more severe in the loading group, but the difference was not statistically significant. Blood and urine tests showed no clinically meaningful changes in either group. It is small and short, but it points the same way: loading is safe for healthy people, and less comfortable.

Kidneys, hair and the rest

In healthy people, the ISSN reviews find no harm to kidney function from short-term loading or long-term use at recommended doses. Creatine does raise creatinine on a blood test, which can look like a kidney problem when it is not; tell your doctor you take it. If you have kidney disease, diabetes with kidney involvement, or take medicines that affect the kidneys, ask your doctor before loading. Every common worry is checked in creatine side effects, and the hair question in does creatine cause hair loss?

What to load with

A loading week uses about 100–140 g, or 20–28 standard servings, so price per gram and verified testing matter more than usual. Use plain creatine monohydrate powder: it is the form every loading study used, and it is the cheapest. Gummies are a poor choice here: you would need a dozen or more a day, and independent tests have found several popular brands with far less creatine than claimed (see the best creatine gummies).

The cheapest verified option in my comparison:

Optimum Nutrition Micronized Creatine — 5 g per scoop, nothing added, Informed Choice certified, about 23¢ per 5 g, so roughly $1 a day while loading.

Check current prices on Amazon

The other picks, including NSF Certified for Sport options, are in the best creatine powders compared. For women, see the best creatine for women; the loading protocol is the same, scaled to body weight.

As an Amazon Associate I earn from qualifying purchases. This never changes a score, a ranking or a verdict — those are decided before any commercial link is considered.

Common questions

Is a creatine loading phase necessary?

No. It only speeds up how fast your muscles fill. Taking 3–5 g a day reaches the same level in about three to four weeks.

How long should a creatine loading phase last?

5 to 7 days. The 1996 biopsy study used 6 days; going longer adds nothing because full muscles excrete the excess.

How much creatine should I take when loading?

About 0.3 g per kg of body weight a day, which is roughly 20 g for most adults, split into four doses.

Can I load with 10 g a day instead?

You can, as a middle path: your muscles will fill faster than at 5 g but slower than at 20 g. There is less biopsy data on this in-between dose, so expect roughly two weeks rather than one. Split it into two 5 g doses.

Should I load creatine on rest days too?

Yes. The goal is to raise stores, which depends on daily intake, not on training that day.

Will I lose the water weight after loading?

Not while you keep taking creatine, because the water sits in your muscles with the creatine. If you stop, it fades over about four to six weeks.

Do I need to load again after a break?

Only if you want full stores quickly. After a break of a month or more, stores are back near baseline, so either load again or restart at 3–5 g a day and wait three to four weeks.

Can women do a loading phase?

Yes, with the same 0.3 g per kg rule, which usually means 15–20 g a day. If bloating is a concern, skipping the loading phase is the gentler route.

Sources

• Hultman E et al. Muscle creatine loading in men. J Appl Physiol. 1996.
• Kreider RB et al. ISSN position stand: safety and efficacy of creatine supplementation in exercise, sport, and medicine. J Int Soc Sports Nutr. 2017.
• Buford TW et al. ISSN position stand: creatine supplementation and exercise. J Int Soc Sports Nutr. 2007.
• Antonio J et al. Common questions and misconceptions about creatine supplementation. J Int Soc Sports Nutr. 2021.
• Ostojic SM, Ahmetovic Z. Gastrointestinal distress after creatine supplementation in athletes: are side effects dose dependent? Res Sports Med. 2008;16(1):15–22.
• Wagner JC et al. Gastrointestinal and fluid retention symptoms associated with creatine monohydrate with and without loading dose over 28 days. medRxiv preprint. 2025.
• Green AL et al. Carbohydrate ingestion augments creatine retention during creatine feeding in humans. Acta Physiol Scand. 1996.
• Forbes SC et al. Meta-analysis examining the importance of creatine ingestion strategies on lean tissue mass and strength in older adults. Nutrients. 2021.