Creatine Monohydrate: What It Does, How Much to Take, and Which Form to Buy

Creatine monohydrate is the standard, most-studied form of creatine, a compound stored in muscle as phosphocreatine to regenerate energy during short, hard efforts. Taken at 3–5 g a day it raises muscle creatine stores and, with resistance training, increases strength, power and lean mass. Newer forms such as creatine HCl, ethyl ester and buffered creatine have not outperformed monohydrate in trials.

Creatine Monohydrate vs HCl vs Ethyl Ester vs Buffered: Evidence Verdict

*Calculated by FormulaCompare from molecular weights (creatine 131.13 g/mol; monohydrate 149.15; hydrochloride 167.59; ethyl ester hydrochloride 195.65). Buffered creatine is monohydrate with an alkaline powder added, so the figure depends on the blend. Review of novel forms: Jäger et al., Amino Acids 2011.

What is creatine monohydrate?

Creatine is made in the body from three amino acids and is also eaten in meat and fish. About 95% of it sits in skeletal muscle, where it is stored as phosphocreatine and used to rebuild ATP during sprints, lifts and jumps. Creatine monohydrate is simply creatine crystallised with one water molecule. It is the form used in almost all of the research. A 2011 review in Amino Acids found that nearly 99% of orally ingested monohydrate is either taken up by muscle or excreted in urine, and is not degraded in normal digestion (Jäger 2011).

How much creatine monohydrate should you take?

The International Society of Sports Nutrition position stand (Kreider et al., 2017) describes two equally valid approaches. Loading: about 0.3 g per kg of body weight per day (roughly 20 g/day, split into four doses) for 5–7 days, then 3–5 g/day to maintain. No loading: the ISSN describes 3 g/day for 28 days as an alternative that raises muscle stores more gradually, reaching a similar level without the loading week. Some studies suggest larger athletes may need 5–10 g/day to maintain stores. Taking creatine with carbohydrate, or carbohydrate and protein, has been reported to promote greater creatine retention.

What does creatine actually do?

Creatine increases the amount of high-intensity work you can do, which over weeks translates into more training volume and greater gains. The ISSN position stand concludes that creatine monohydrate is “the most effective ergogenic nutritional supplement currently available to athletes” for increasing high-intensity exercise capacity and lean body mass during training. Benefits are largest for repeated short efforts such as weight training and sprinting, and minimal for steady endurance work. Research also covers recovery, older adults and brain health, but those uses are less established.

Creatine monohydrate vs creatine HCl

Creatine HCl is marketed as more soluble, so you can take a smaller dose with less bloating. The only well-controlled head-to-head we found, an 8-week trial in 40 young men doing resistance training, gave both forms at 0.03 g/kg/day. Both groups gained strength and muscle versus placebo, and the authors reported “Cr-HCl showing no benefit over CrM” (Eghbali 2024). Per gram, HCl also contains less creatine (about 78% vs 88%). Read the full breakdown in creatine monohydrate vs HCl.

Best creatine by need

A form ranking, not a paid brand ranking.

• Best overall: plain creatine monohydrate powder — most evidence, lowest cost per gram.
• Best if powder upsets your stomach: split monohydrate into two 2–3 g doses with meals before switching forms.
• Best for convenience: monohydrate capsules or gummies — check the label delivers a full 3–5 g per daily serving.
• Best quality signal: a third-party mark such as NSF Certified for Sport or Informed Sport, especially for tested athletes.
• Not worth the premium: HCl, ethyl ester, buffered, nitrate or “matrix” blends.

Is creatine safe?

For healthy people, the evidence says yes. The ISSN position stand states that creatine supplementation, including doses up to 30 g/day for 5 years, is safe and well tolerated in healthy people, and that there is no evidence it increases musculoskeletal injury, dehydration, cramping, gastrointestinal upset or renal dysfunction. The most consistent effect is a short-term fluid retention of about 0.5–1.0 L during loading, roughly matching the early weight gain. People with existing kidney disease should talk to their nephrologist first.

Does creatine raise creatinine or harm the kidneys?

Creatinine is the normal breakdown product of creatine: the ISSN notes about 1–2% of muscle creatine is degraded into creatinine and excreted each day. Raising your creatine intake can therefore nudge blood creatinine up, which is the marker used to estimate kidney function. Tell your doctor you take creatine before blood work. In the ISSN review, a 21-month study of college football players taking 5–10 g/day found no clinically significant differences in markers of renal function versus non-users.

When should you take creatine?

Timing matters far less than taking it every day, because creatine works by keeping muscle stores full rather than by an acute boost. The ISSN notes that adding carbohydrate, or carbohydrate and protein, appears to increase muscle uptake of creatine, although the performance effect may not be larger. Mixing it into a post-workout shake is a convenient habit. See our supplement timing guide for how it fits with other supplements.

Who should and should not take creatine?

Creatine is most useful for people doing resistance training or repeated sprint sports, vegetarians and vegans (who start with lower muscle creatine; the ISSN notes a pound of uncooked beef or salmon supplies about 1–2 g), and older adults combining it with strength training. It is not recommended without medical advice for people with kidney disease. Data in pregnancy and in children are limited, so those groups should ask a clinician. Our creatine for women guide covers female-specific evidence.

Creatine FAQ

What is the best form of creatine?

Creatine monohydrate. It is the form used in nearly all research, raises muscle creatine stores by roughly 15 to 40 percent, and no newer form has beaten it in head-to-head trials.

How much creatine monohydrate should I take per day?

3 to 5 grams a day for maintenance. You can optionally load with about 0.3 g per kg of body weight per day, roughly 20 grams split into four doses, for 5 to 7 days first, per the ISSN position stand.

Do I need to do a creatine loading phase?

No. Loading for 5 to 7 days is the quickest way to fill muscle stores, but the ISSN also describes 3 grams a day for 28 days as an alternative that raises stores more gradually.

Is creatine HCl better than monohydrate?

No. An 8-week randomized trial found creatine HCl and monohydrate produced similar strength and muscle gains, with HCl showing no benefit over monohydrate. HCl also contains less creatine per gram.

Is creatine safe for your kidneys?

In healthy people, the evidence says yes. The ISSN position stand found no evidence that creatine increases renal dysfunction. Creatine can nudge blood creatinine up, so tell your doctor before kidney blood tests. People with kidney disease should get medical advice first.

Does creatine cause weight gain?

Often a little at first. Early studies cited by the ISSN found loading caused short-term fluid retention of about 0.5 to 1.0 liters, roughly matching the initial weight gain. Over months of training, added lean mass can raise weight further.

When is the best time to take creatine?

Any time you will remember daily. Consistency matters more than timing. Taking it with a meal containing carbohydrate and protein may slightly improve uptake.

How much creatine do you get from food?

About 1 to 2 grams per pound of uncooked beef or salmon, according to the ISSN. A normal diet supplying 1 to 2 grams a day leaves muscle stores about 60 to 80 percent saturated, which is why supplements raise them.

Is creatine ethyl ester worth buying?

No. A 42-day trial found creatine ethyl ester was less effective than monohydrate at raising serum and muscle creatine and did not improve body composition or performance more.

Sources

1. 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;14:18
2. Jäger R, et al. Analysis of the efficacy, safety, and regulatory status of novel forms of creatine. Amino Acids. 2011;40(5):1369-83
3. Eghbali E, Arazi H, Suzuki K. Creatine hydrochloride or monohydrate alongside resistance training. Physiol Res. 2024;73(5):739-753
4. Spillane M, et al. Effects of creatine ethyl ester supplementation combined with heavy resistance training. J Int Soc Sports Nutr. 2009;6:6
5. Jagim AR, et al. A buffered form of creatine does not promote greater changes in muscle creatine content, body composition, or training adaptations than creatine monohydrate. J Int Soc Sports Nutr. 2012;9:43