How Much Creatine Should You Take? Dose, Loading and Whether It Works

Creatine is the supplement most lifters ask about after protein, and it's one of the few with a large, consistent body of research behind it. Here's what it does, how much to take, and what the common worries (water weight, hair loss, kidneys) actually look like in the evidence.

What creatine is and what it does

Creatine isn't a drug or a hormone. Your liver and kidneys make about 1 g a day from three amino acids, and you get a little more from meat and fish. A 70 kg (154 lb) person carries about 120 g of creatine and phosphocreatine, almost all of it in skeletal and heart muscle (NIH Office of Dietary Supplements).

Muscles use phosphocreatine to quickly regenerate energy during short, hard efforts: a heavy set, a sprint, a jump. Supplementing tops up those stores, which lets you squeeze out a bit more work in each hard set. Over weeks of training, that extra work is where the benefit comes from.

Does creatine work?

For the right kind of training, yes. The NIH fact sheet summarises that creatine enhances performance during repeated short bursts of high-intensity activity, such as sprinting and weight lifting, and short-term use often significantly increases strength and power. It also notes that creatine seems to be of little value for endurance sports like distance running or swimming (NIH ODS). The same page reports the International Society of Sports Nutrition's view that creatine monohydrate is the most effective supplement currently available for high-intensity exercise capacity and lean body mass.

Two caveats keep expectations realistic:

• It amplifies training; it doesn't replace it. A 2021 review of common creatine questions notes that creatine on its own, without resistance training, is unlikely to produce substantial gains in strength in older adults; the benefits show up when it's combined with exercise (Antonio et al., 2021). The engine is still progressive overload.
• People respond differently. Responses vary with factors like diet and muscle fibre type. Vegetarians, who start with lower muscle creatine, might see larger responses than meat eaters (NIH ODS).

How much creatine to take

There are two well-studied ways to start. Both end in the same place: muscles saturated with creatine, maintained with a small daily dose.

For most people, the simple option wins: take 3–5 g every day and stop thinking about it. The 2021 review says plainly that you don't have to load, and recommends about 3–5 g a day for at least 4 weeks to reach similar muscle saturation. If you do load, it suggests keeping each serving to 10 g or less, because larger single doses may cause stomach upset or diarrhea (Antonio et al., 2021).

Water weight: what to expect on the scale

The most common effect people notice is a small jump on the scale. A loading phase typically adds 1–3 kg (about 2–7 lb) of body mass, mostly water held inside the muscle, according to the 2021 review. The review also notes that several training studies of 5–10 weeks found no increase in total body water, so the long-term "bloating" reputation is overstated. The NIH reports gains of 1–2 kg in a month in strength-training studies.

None of this is fat: the 2021 review found that randomized trials lasting from one week to two years do not show creatine increasing fat mass. But if you're tracking weight loss, a sudden jump in the first week can be confusing. Read your weight trend over several weeks rather than day to day, as covered in how to set a sensible calorie deficit.

Is creatine safe?

For healthy adults, the evidence is reassuring. The NIH describes creatine as safe for short-term use by healthy adults, with evidence that use for several years is safe, and notes that studies have found no consistent side effects other than weight gain. Anecdotal reports include nausea, stomach upset, muscle cramps and heat intolerance, and staying well hydrated may minimise these uncommon issues (NIH ODS).

• Kidneys: the 2021 review concludes that recommended doses do not cause kidney damage in healthy people. It does flag that creatine can raise blood creatinine, a marker used in kidney tests, so tell your doctor you take it before bloodwork.
• Hair loss: this worry traces back to a single study that found a rise in DHT (still within normal clinical limits). It hasn't been replicated, and no study has reported hair loss in humans (Antonio et al., 2021).
• Steroids: creatine is not an anabolic steroid. It has a completely different chemical structure and is legal to buy and use.

If you have kidney disease or another medical condition, are pregnant, or take regular medication, check with your doctor or pharmacist before starting any supplement.

Do you need creatine at all?

No. It's a small, optional extra. The things that build muscle are, in order: consistent strength training with progressive overload, enough total protein (about 1.6 g per kg of body weight), enough sleep and enough food. Creatine is worth considering once those are in place, especially if you lift, play stop-and-go sports or eat little meat. If you mainly run long distances, it's unlikely to help much.