How to Take Creatine: Dose, Loading and Timing

People ask three practical questions about creatine: how much to take, whether to "load" it, and when to take it. This guide sets out what US label rules and sports-nutrition research say, so you can compare them with the directions on your own tub. It is general information for healthy adults, not medical advice. For choosing a product, see our buying guide.

Start with the label's directions

Every supplement label shows a serving size on the Supplement Facts panel (21 CFR 101.36), and the manufacturer prints its own directions for use. FDA says it is not authorized to approve dietary supplements for safety and effectiveness before they are marketed. FDA's advice to consumers is to talk with a doctor, pharmacist or other health care professional before using a supplement. Everything below is background. The directions on your pack come first.

Where 3 to 5 g a day comes from

The ISSN position stand describes 3 to 5 g a day as the amount that maintains raised muscle creatine, and says taking 3 to 5 g a day from the start raises stores more slowly, over about three to four weeks. A 2021 question-and-answer paper from ISSN members likewise gives 3 to 5 g a day for at least four weeks. The two example products in our buying guide both use a 5 g scoop of monohydrate, which supplies about 4.4 g of creatine. These figures come from sports-nutrition research and from manufacturers' directions, so follow your label.

The 3 or 5 g is a weight of powder, not a volume. Scoop sizes differ between products, so read the weight a scoop holds on the label rather than assuming a level scoop is 5 g.

Loading: what it is and why we do not suggest it

A "loading phase" means taking a much larger amount for the first few days. The ISSN position stand describes about 0.3 g per kilogram of body weight a day (about 0.14 g per pound) for 5 to 7 days, split into several doses, which is about 21 g a day for a 154 lb (70 kg) adult, followed by 3 to 5 g a day. The 2024 paper from ISSN members puts loading at about 20 g a day. The 2021 paper concludes that you do not have to load creatine.

Some US labels still print a loading option. A bigger dose also raises the chance of stomach upset: a 2025 review in Frontiers in Nutrition (its publication fee was paid by the creatine maker Alzchem) says stomach distress is dose-related, advises keeping single doses to 5 g or less, and notes that in one trial a single 10 g dose caused more diarrhea than two 5 g doses. This guide does not suggest loading. If you are wondering whether it would suit you, ask a doctor or pharmacist.

Timing: before, after or any time

The 2024 Part II paper says taking creatine before or after exercise appears similarly effective, and that consistent intake during a training program is likely the most important variable. Choose a time you will remember.

With food, a drink or other ingredients

The same paper says creatine works with or without other nutrients, although glucose and insulin may raise muscle uptake, and that evidence this improves strength or body composition is limited. Carbohydrate is therefore optional. Mix the powder as your label directs, in the amount of liquid it names.

On caffeine, the paper concludes that short-term intake (under 5 mg per kg of body weight a day) likely does not oppose creatine, and adds that combining chronic caffeine with creatine may increase stomach upset. It also says that creatine itself does not drive urine volume; the extra urination people notice is linked to the extra fluid they drink with it. The 2021 paper concludes that creatine does not cause dehydration or muscle cramping.

Mixing and storing

The ISSN position stand says creatine is relatively stable in solution at neutral pH but converts to creatinine in acidic liquids over days of storage: in its figures, 4% at pH 5.5, 12% at pH 4.5 and 21% at pH 3.5 after three days at 77 °F (25 °C). It gives this as the main reason creatine is sold as a dry powder. It also says that little conversion happens in the gut and that absorption into the blood is nearly 100%. The practical point is to keep the tub closed and dry, and to mix a drink when you want it rather than storing a made-up acidic one. Follow any storage line on the label.

Vegetarians and vegans

The position stand reports lower muscle creatine stores in vegetarians, and the 2024 paper says people with lower starting stores, such as vegans and vegetarians, may respond more. That is a statement about stores in muscle, not a promise about performance. If you avoid animal products, read the label for vegetarian or vegan suitability, because that is where the manufacturer states it.

Measuring accurately

If you want to check a scoop against the stated weight, a small scale that reads to 0.1 g does the job: digital pocket scales on Amazon (opens in a new tab) is a search for them. Capsule products state how many capsules make one serving, and the creatine per serving is the figure to compare. Plain powders are listed in this search for unflavored creatine monohydrate powder on Amazon (opens in a new tab).

What to expect

The ISSN position stand says the only consistently reported side effect of creatine is weight gain, and the 2021 paper ties a 1 to 3 kg (2 to 7 lb) rise in body mass, mostly body water, to the loading phase, while noting that creatine does not always lead to water retention. If you feel unwell, stop and speak to a doctor or pharmacist. If you think a supplement caused a serious reaction, FDA asks you to stop using it and file a report through its Safety Reporting Portal.

If you have blood tests, tell the clinician you take creatine. ISSN members advise caution when interpreting blood creatinine and estimated kidney function in people who take creatine, because creatine can affect those readings.

Who should ask first

Speak to a doctor or pharmacist before you start if you have kidney disease, are pregnant or nursing, take prescribed medicines or have a diagnosed condition, or are under 18. FDA says certain supplements can change how a medicine is absorbed, metabolized or excreted, and advises bringing a list of every supplement and medicine to appointments. The American Academy of Orthopaedic Surgeons patient site says people with kidney problems, children and adolescents under 18, and pregnant or nursing women should never take creatine supplements, while the ISSN accepts supervised use by young athletes, so views differ and a doctor should decide. USADA tells athletes that you always assume some risk of testing positive when you use supplements. The cautions in our buying guide go into more detail.

The label is the authority on your product's dose and warnings, and a doctor or pharmacist is the right person to ask about your own health.